Device for measuring content of carbonate in soil

Abstract

The utility model discloses a device for measuring the content of carbonate in soil. The device comprises a magnetic stirrer; the reaction bottle is arranged on the magnetic stirrer, and a bottle opening of the reaction bottle is plugged with a first rubber plug; a liquid outlet pipe on the separating funnel extends into the reaction bottle through the first rubber plug, and a liquid outlet valve is arranged on the liquid outlet pipe; the pressure gauge is connected with a detection tube, and the detection tube extends into the reaction bottle through the first rubber plug; one end of the air outlet assembly extends into the reaction bottle through the first rubber plug, the other end of the air outlet assembly is arranged outside the reaction bottle, and an air outlet switch is arranged on the air outlet assembly; the interior of the titration absorption bottle is communicated with the other end of the gas outlet assembly, and a titration liquid dropping pipe is arranged at the top end of the titration absorption bottle. The pressure gauge in the device can monitor whether the reaction solution in the reaction bottle is completely reacted or not, so that the measurement accuracy is improved, methanol which is a non-aqueous solvent is used as a titration solution, the acidity of the solution in the titration absorption bottle is greatly enhanced, and acid-base titration can be directly carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of soil carbonate content testing, in particular to a device for measuring the carbonate content in soil. Background Art

[0002] Carbonate is the main component of soil, mainly synthesized by carbonate and cations such as calcium and magnesium. It is one of the important indicators of soil environmental quality and is of great significance to alleviating soil acidification and maintaining soil ecological functions. Therefore, it is one of the basic indicators for soil quality investigation and evaluation in various countries.

[0003] The existing methods for determining the carbonate content in soil mainly include the gas volume method and the rapid neutralization titration method, such as the determination of the total amount of insoluble carbonate (CaCO3, MgCO3) disclosed on the Baidu website (the website is https: / / baijiahao.baidu.com / s?id=1753238697667480247&wfr=spider&for=pc).

[0004] The gas volume method calculates the soil carbonate content by measuring the volume of CO2 gas released when the soil sample reacts with acid. The temperature and atmospheric pressure correction calculation method used in the gas volume method is inconvenient to operate. Each test requires measuring the temperature and atmospheric pressure for conversion, and the calculation is complicated.

[0005] The steps of the rapid neutralization method are: weigh 5-25g of soil (containing CaCO3); 0.25-1g) that passes through a 0.25mm sieve, put it in a 250mL beaker, slowly add 0.5mol·L-HCl20-80mL (the amount of HCL must be more than twice the amount required to neutralize CaCO3) with a burette, shake well, cover with a watch glass, heat on low heat, and boil for 5 minutes to drive out all CO2. After cooling, filter, wash with CO2-free water until there is no acid reaction (can be checked with bromothymol blue indicator, blue color). Do not use too much water each time (about 10mL), and add water when there is no water dripping from the funnel. Add 3-4 drops of phenolphthalein indicator (1 drop of indicator for every 10mL of filtrate) to the filtrate, titrate with 0.5mol·L-1 NaOH while hot until pink appears (or reddish-brown turbidity is found), record the volume of alkali solution used, and then calculate the result. In addition, the Baidu website is https: / / baijiahao.baidu.com / s?id=1711113559862248491&wfr=spider&for=pc, which also discloses the use of titration to measure soil carbonate content. Obviously, in the disclosed titration process, it is necessary to wash the filtered solution several times with deionized water to remove CO2, which is cumbersome to operate, and it is necessary to manually shake the hydrochloric acid and carbonate during the reaction to accelerate the reaction of the two. However, manual shaking will increase the physical labor of the experimenter, and it is also impossible to monitor whether the reaction is complete, resulting in a large deviation in the measurement results.

[0006] Therefore, how to provide a device for measuring the carbonate content in soil that is simple to operate, does not require manual shaking, reduces the physical labor of experimenters, and has high measurement accuracy is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0007] In view of this, the utility model provides a device for determining the carbonate content in soil, which is simple to operate, does not require manual shaking, reduces the physical labor of experimenters, and has high accuracy in measuring results.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A device for determining the carbonate content in soil, comprising:

[0010] Magnetic stirrer;

[0011] A reaction bottle, the reaction bottle is placed on the magnetic stirrer, a magnetic stirrer and a soil sample are placed in the reaction bottle, and a first rubber stopper is installed on the bottle mouth of the reaction bottle;

[0012] A separatory funnel, wherein the separatory funnel contains a dilute hydrochloric acid solution, wherein a liquid outlet pipe on the separatory funnel extends into the reaction flask through the first rubber stopper, and a liquid outlet valve is provided on the liquid outlet pipe;

[0013] A pressure gauge, the pressure gauge is connected to a detection tube, and the detection tube extends into the reaction bottle through the first rubber stopper;

[0014] A gas outlet component, one end of which extends into the reaction bottle through the first rubber stopper, and the other end is placed outside the reaction bottle, and a gas outlet switch is provided on the gas outlet component;

[0015] The titration absorption bottle is fixed on the bracket, the interior of the titration absorption bottle is connected with the other end of the gas outlet component, and the top of the titration absorption bottle is provided with a titration liquid dripping tube.

[0016] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a device for determining the carbonate content in soil. When in use, a soil sample and a magnetic stirrer with a good weight are placed in a reaction bottle, the liquid outlet valve is opened, and the hydrochloric acid in the separatory funnel is allowed to flow into the reaction bottle. The gas outlet switch is immediately closed, and the magnetic stirrer is turned on to allow the carbonate (CaCO3) in the reaction bottle to fully react with the hydrochloric acid (HCl). There is no need for the experimenter to manually shake the reaction bottle, which reduces the experimenter's physical labor. At this time, carbon dioxide gas (CO2) is generated in the reaction bottle. After the pressure gauge indicator needle is stable, it means that the reaction in the reaction bottle has been complete, and the pressure value is recorded at this time. Then turn on the gas outlet switch, and the carbon dioxide gas enters the titration absorption bottle through the gas outlet component. At the same time, the titration solution is added through the titration dropper (the titration solution is 5g of potassium hydroxide added to a 1:1 methanol and acetone mixture. After it is fully dissolved, thymolphthalein is added. Thymolphthalein is an acid-base indicator. The reaction formula in the titration absorption bottle is: CH3OH+KOH=CH3OK(potassium methylate)+H2O, CH3OK+CO2=CH3KCO3(potassium methyl carbonate). Carbon dioxide is dissolved in methanol solution. The purpose of adding acetone is to reduce surface tension, make the generated gas easier to disperse in the solution, and accelerate the absorption rate.), and observe the color of the titration solution. After the color changes (the original mixed solution is purple, as carbon dioxide is generated, it gradually dissolves in the solution, causing the pH value of the mixed solution to begin to change, and the color of the mixed solution gradually becomes lighter. At this time, the titration solution is supplemented. As the amount of carbon dioxide gradually decreases, the titration end point is that the mixed solution turns light blue.), record the volume of the titration liquid, and calculate the carbonate content.

[0017] The device achieves automatic and sufficient stirring of the reaction solution through a magnetic stirrer, thereby accelerating the reaction rate of the reaction solution. There is no need for manual stirring or shaking of the reaction bottle, which greatly reduces the physical labor of the experimenters. In addition, a pressure gauge is provided on the reaction bottle to monitor whether the reaction solution in the reaction bottle is completely reacted, thereby improving the accuracy of the measurement. The device uses methanol, a non-aqueous solvent, as a titrant, which greatly enhances the acidity of the solution in the titration absorption bottle, and can directly perform acid-base titration.

[0018] Furthermore, it also includes: an air compression pump, the air outlet of the air compression pump is connected to an air intake component, the tube end of the air intake component away from the air compression pump extends into the reaction bottle through the first rubber stopper, and the air intake component is provided with an air intake switch.

[0019] The beneficial effect of adopting the above technical scheme is: put the weighed soil sample and the magnetic stirrer in the reaction bottle, close the air inlet switch, open the liquid outlet valve, let the hydrochloric acid in the separatory funnel flow into the reaction bottle, immediately close the air outlet switch, turn on the magnetic stirrer, wait for the pressure gauge indicator needle to stabilize, turn on the air inlet switch, the air outlet switch, and turn on the air compressor pump. The air source generated by the air compressor pump will quickly blow all the carbon dioxide gas deposited in the reaction bottle out of the reaction bottle, so as to avoid the inaccurate measurement of carbonate content caused by the failure of carbon dioxide to completely enter the titration absorption bottle.

[0020] Furthermore, the air intake assembly includes: an air pipe, an air drying tower and a first glass tube, one end of the air pipe is connected to the air outlet of the air compression pump, and the other end is connected to the air inlet of the air drying tower, the air outlet of the air drying tower is connected to one end of the first glass tube, the other end of the first glass tube extends into the reaction bottle through the first rubber stopper, and the first glass tube is provided with the air intake switch.

[0021] The beneficial effect of adopting the above technical solution is that the air generated by the air compression pump first enters the air drying tower through the air pipe for drying, and the dried air enters the reaction bottle through the first glass tube, and then blows the carbon dioxide in the reaction bottle out of the reaction bottle. Therefore, the setting of the air drying tower can avoid the problem that there is moisture in the air entering the reaction bottle, and then the carbon dioxide in the reaction bottle dissolves in water, resulting in a decrease in the carbon dioxide content and affecting the measurement results.

[0022] Furthermore, the first glass tube includes: a first tube segment, a second tube segment and a first connecting hose, one end of the first tube segment is connected to the air outlet of the air drying tower, and the other end is connected to one end of the first connecting hose, the other end of the first connecting hose is connected to one end of the second tube segment, the other end of the second tube segment extends into the reaction bottle through the first rubber stopper, and the air inlet switch is a first water stop clamp, which is clamped on the first connecting hose.

[0023] The beneficial effect of adopting the above technical solution is that the first connecting hose can be opened and closed by the first water stop clamp, thereby realizing the opening and closing operation of the first glass tube pipeline. The structure is simple and easy to operate.

[0024] Furthermore, the gas outlet component includes: a second glass tube, a drying bottle, and a connecting component. One end of the second glass tube extends into the reaction bottle through the first rubber stopper, and the other end extends into the drying bottle through a second rubber stopper installed on the bottle mouth of the drying bottle. One end of the connecting component extends into the drying bottle through the second rubber stopper, and the other end is connected to the interior of the titration absorption bottle. The gas outlet switch is provided on the second glass tube.

[0025] The beneficial effect of adopting the above technical solution is that the dried air blows out the carbon dioxide gas generated in the reaction bottle and enters the drying bottle through the second glass tube for secondary drying, thereby preventing the presence of moisture in the carbon dioxide from affecting the measurement results.

[0026] Furthermore, the connecting assembly includes: a third glass tube, a buffer bottle, and a fourth glass tube, one end of the third glass tube extends into the drying bottle through the second rubber stopper, and the other end extends into the buffer bottle through the third rubber stopper installed on the bottle mouth of the buffer bottle, one end of the fourth glass tube extends into the buffer bottle through the third rubber stopper, and the other end is connected to the interior of the titration absorption bottle.

[0027] The beneficial effect of the above technical solution is that the carbon dioxide after secondary drying enters the buffer bottle through the third glass tube, and then the buffered carbon dioxide enters the titration absorption bottle through the fourth glass tube. Therefore, the setting of the buffer bottle can make the generated gas output stably, ensuring the best effect of subsequent titration.

[0028] Furthermore, a porous glass baffle is fixed inside the titration absorption bottle, and the other end of the fourth glass tube is located below the porous glass baffle.

[0029] The beneficial effects of adopting the above technical solution are as follows: the porous glass baffle can make the carbon dioxide be distributed steadily and evenly in the titration absorption bottle located in the space above the porous glass baffle, and after the air compression pump is turned on, gas is continuously generated to blow the carbon dioxide generated by the reaction in the reaction bottle into the titration absorption bottle, and the gas flow of the air compression pump can be adjusted so that the titration solution can be placed above the glass baffle under the action of air pressure, so that the titration solution is mixed with the carbon dioxide located above the porous glass baffle, which is convenient for observing the color of the titration solution.

[0030] Furthermore, the second glass tube includes: a third tube segment, a fourth tube segment and a second connecting hose, one end of the third tube segment extends into the reaction bottle through the first rubber stopper, and the other end is connected to one end of the second connecting hose, the other end of the second connecting hose is connected to one end of the fourth tube segment, and the other end of the fourth tube segment extends into the drying bottle through the second rubber stopper, and the gas outlet switch is a second water stop clamp, which is clamped on the second connecting hose.

[0031] The beneficial effect of adopting the above technical solution is that the second connecting hose can be opened and closed by the second water stop clamp, thereby realizing the opening and closing operation of the second glass tube pipeline. The structure is simple and easy to operate.

[0032] Furthermore, a waste liquid discharge pipe is provided at the bottom end of the titration absorption bottle, and a waste liquid discharge valve is provided on the waste liquid discharge pipe.

[0033] The beneficial effect of adopting the above technical solution is: after the titration is completed, the waste liquid discharge valve is opened to discharge the waste liquid.

[0034] Furthermore, a waste gas discharge pipe is provided at the top of the titration absorption bottle.

[0035] The beneficial effect of adopting the above technical solution is that the waste gas in the titration absorption bottle can be discharged through the waste gas discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0037] Figure 1 The utility model provides a schematic structural diagram of a device for measuring the carbonate content in soil. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] like Figure 1 As shown, the embodiment of the utility model discloses a device for measuring the carbonate content in soil, comprising:

[0040] Magnetic stirrer 1;

[0041] A reaction bottle 2, the reaction bottle 2 is placed on the magnetic stirrer 1, a magnetic stirrer 3 and a soil sample are placed in the reaction bottle 2, and a first rubber stopper 21 is installed on the bottle mouth of the reaction bottle 2;

[0042] A separatory funnel 4, in which a dilute hydrochloric acid solution is contained, a liquid outlet pipe 41 on the separatory funnel extends into the reaction bottle 2 through the first rubber stopper 21, and a liquid outlet valve 42 is provided on the liquid outlet pipe 41;

[0043] A pressure gauge 5, the pressure gauge 5 is connected with a detection tube 6, and the detection tube 6 extends into the reaction bottle 2 through a first rubber stopper 21;

[0044] A gas outlet component 7, one end of which extends into the reaction bottle 2 through the first rubber stopper 21, and the other end is placed outside the reaction bottle 2. A gas outlet switch 74 is provided on the gas outlet component 7;

[0045] The titration absorption bottle 8 is fixed on the bracket 9, the interior of the titration absorption bottle 8 is connected with the other end of the gas outlet component 7, and a titration liquid dripping tube 10 is arranged on the top of the titration absorption bottle 8.

[0046] In some embodiments, the device further comprises: an air compression pump 11, the air outlet of the air compression pump 11 is connected to an air intake assembly 12, the pipe end of the air intake assembly 12 away from the air compression pump 11 extends into the reaction bottle 2 through the first rubber stopper 21, and an air intake switch 124 is provided on the air intake assembly 12. In this way, when the pressure gauge is stable, the air intake switch, the air outlet switch, and the air compression pump are turned on, and the air source generated by the air compression pump quickly blows all the carbon dioxide gas deposited in the reaction bottle out of the reaction bottle, so as to avoid inaccurate measurement of carbonate content caused by incomplete entry of carbon dioxide into the titration absorption bottle.

[0047] Specifically, the air intake assembly 12 includes: an air pipe 121, an air drying tower 122 and a first glass tube 123. One end of the air pipe 121 is connected to the air outlet of the air compression pump 11, and the other end is connected to the air inlet of the air drying tower 122. The air outlet of the air drying tower 122 is connected to one end of the first glass tube 123. The other end of the first glass tube 123 extends into the reaction bottle 2 through the first rubber stopper 21. The first glass tube 123 is provided with an air intake switch 124.

[0048] Among them, the air drying tower 122 is equipped with a soda lime layer 1221, and a cotton layer 1222 is laid on the top of the soda lime layer 1221, so that the gas generated by the air compression pump 11 enters the air drying tower 122 through the air pipe 121, and the soda lime layer 1221 absorbs and dries the moisture in the gas. The dried gas is filtered by the cotton layer 1222, which can prevent the dry gas entering the first glass tube 123 from containing soda lime impurities, so that the gas entering the reaction bottle 2 is clean and dry gas, and will not interfere with the reagents in the reaction bottle.

[0049] In a preferred embodiment, the first glass tube 123 includes: a first tube section 1231, a second tube section 1232 and a first connecting hose 1233. One end of the first tube section 1231 is connected to the air outlet of the air drying tower 122, and the other end is connected to one end of the first connecting hose 1233. The other end of the first connecting hose 1233 is connected to one end of the second tube section 1232. The other end of the second tube section 1232 extends into the reaction bottle 2 through the first rubber stopper 21. The air inlet switch 124 is a first water stopper clamp, which is clamped on the first connecting hose 1233. In this way, the first connecting hose can be controlled to be on and off by the first water stopper clamp.

[0050] The gas outlet component 7 includes: a second glass tube 71, a drying bottle 72, and a connecting component 73. One end of the second glass tube 71 extends into the reaction bottle 2 through the first rubber stopper 21, and the other end extends into the drying bottle 72 through the second rubber stopper 721 installed on the bottle mouth of the drying bottle 72. One end of the connecting component 73 extends into the drying bottle 72 through the second rubber stopper 721, and the other end is connected to the interior of the titration absorption bottle 8. A gas outlet switch 74 is provided on the second glass tube 71.

[0051] The drying bottle 72 contains concentrated sulfuric acid, so that the dried gas blows out the carbon dioxide gas generated in the reaction bottle, and passes through the drying bottle 72 filled with concentrated sulfuric acid to perform secondary drying on the gas, thereby preventing the carbon dioxide entering the titration absorption bottle from carrying moisture and affecting the measurement results.

[0052] In a preferred embodiment, the connecting component 73 includes: a third glass tube 731, a buffer bottle 732, and a fourth glass tube 733. One end of the third glass tube 731 extends into the drying bottle 72 through the second rubber stopper 721, and the other end extends into the buffer bottle 732 through the third rubber stopper 7321 installed on the bottle mouth of the buffer bottle 732. One end of the fourth glass tube 733 extends into the buffer bottle 732 through the third rubber stopper 7321, and the other end is connected to the interior of the titration absorption bottle 8.

[0053] In this way, the carbon dioxide after secondary drying enters the buffer bottle through the third glass tube, and then the buffered carbon dioxide enters the titration absorption bottle through the fourth glass tube. Therefore, the setting of the buffer bottle can make the generated gas output stably, ensuring the best effect of subsequent titration.

[0054] In a preferred embodiment, the second glass tube 71 includes: a third tube section 711, a fourth tube section 712 and a second connecting hose 713, one end of the third tube section 711 extends into the reaction bottle 2 through the first rubber stopper 21, and the other end is connected to one end of the second connecting hose 713, the other end of the second connecting hose 713 is connected to one end of the fourth tube section 712, and the other end of the fourth tube section 712 extends into the drying bottle 72 through the second rubber stopper 721, and the gas outlet switch 74 is a second water stopper clamp, which is clamped on the second connecting hose 713. In this way, the second connecting hose can be controlled to be on and off by the second water stopper clamp.

[0055] A porous glass baffle 13 is fixed inside the titration absorption bottle 8, and the other end of the fourth glass tube 733 is located below the porous glass baffle 13. In this way, the carbon dioxide entering the titration absorption bottle can be evenly distributed in the titration absorption bottle in the space above the porous glass baffle 13 after passing through the porous glass baffle.

[0056] The bottom end of the titration absorption bottle 8 is provided with a waste liquid discharge pipe 14, and a waste liquid discharge valve 15 is provided on the waste liquid discharge pipe 14. The top end of the titration absorption bottle 8 is provided with a waste gas discharge pipe 16.

[0057] When the device is used, a weighed soil sample and a magnetic stirrer 3 are placed in the reaction bottle 2, hydrochloric acid is pre-filled in the separating funnel 4, the first water stop clamp, i.e., the air inlet switch 124, is closed, the second water stop clamp, i.e., the air outlet switch 74, is opened, the liquid outlet valve 42 on the separating tube 41 is opened, so that all the hydrochloric acid flows into the reaction bottle 2 through the separating tube 41, the air outlet switch 74 is immediately closed, the magnetic stirrer 1 is turned on, so that the calcium carbonate in the soil reacts fully with the hydrochloric acid, at which time the chemical reaction formula carried out in the reaction bottle 2 is CaCO3+2HCl=CaCl2+H2O+CO2↑, and when the indicator needle of the pressure gauge 5 is stable, it is proved that the reaction has been completed, and the pressure value is recorded at this time. After that, the air source is provided by the air compressor 11, and the air inlet switch 124 and the air outlet switch 74 are turned on at the same time. The gas generated by the air compressor 11 enters the absorption tower 122 equipped with the soda lime layer 1221 through the air pipe 121. The soda lime absorbs the moisture in the gas. The dried gas is filtered through the cotton layer 1222 and enters the reaction bottle 2 through the first glass tube 123. Then, the dried gas blows out the carbon dioxide gas generated in the reaction bottle 2, passes through the second glass tube 71 and passes through the absorption tower 122 equipped with the concentrated carbon dioxide gas. The gas is dried in a drying bottle 72 of sulfuric acid, and then enters the buffer bottle 732 through the third glass tube 731 for gas buffering. After that, the buffered gas enters the titration absorption bottle 8 through the fourth glass tube 733, and is evenly distributed in the space above the porous glass baffle 13 through the porous glass baffle 13. At the same time, a titration solution is added through the titration dropper 10 using a burette (the titration solution is 5g of potassium hydroxide added to a 1:1 methanol and acetone mixture. After it is fully dissolved, thymolphthalein is added. Thymephthalein is an acid-base indicator. The reaction formula in the titration absorption bottle is: CH3OH+KOH=CH3OK (potassium methylate)+H2O, CH3OK+CO2=CH3KCO3 (potassium methyl carbonate). Carbon dioxide is dissolved in methanol solution. The purpose of adding acetone is to reduce surface tension, make the generated gas more easily dispersed in the solution, and accelerate the absorption rate. ), and adjust the gas flow rate of the air compression pump 11 to keep the titration liquid above the porous glass baffle 13, so as to facilitate uniform mixing with the carbon dioxide above the porous glass plate 13, and better judge the titration end point. Then observe the color of the titration liquid. After the color changes (the original mixed solution is purple, as carbon dioxide is generated, it gradually dissolves in the solution, so that the pH value of the mixed solution begins to change, and the color of the mixed solution gradually becomes lighter. At this time, the titration liquid is supplemented. As the amount of carbon dioxide gradually decreases, the titration end point is that the mixed solution becomes light blue.), at this time, the volume added to the titration absorption bottle is accurately recorded by a burette with a scale, and the content of carbonate is calculated according to the following formula:

[0058] Calcium carbonate content (g·kg -1 ) = (titer of the titration solution to calcium carbonate (g·mL -1)×volume of consumed titrant (mL) / mass of sample (g))×1000.

[0059] The remaining gas blown out by the air compressor is discharged through the waste gas discharge pipe 16 above the titration absorption bottle. After the titration is completed, the waste liquid discharge valve 15 below the titration absorption bottle is opened to discharge the waste liquid.

[0060] Therefore, the device realizes automatic and full stirring of the reaction solution through a magnetic stirrer, accelerates the reaction rate of the reaction solution, does not require manual stirring or shaking of the reaction bottle, and greatly reduces the physical labor of the experimenter; in addition, a pressure gauge is set on the reaction bottle to monitor whether the reaction solution in the reaction bottle is completely reacted, thereby improving the accuracy of the measurement; and the device uses methanol, a non-aqueous solvent, as a titrant, which greatly enhances the acidity of the solution in the titration absorption bottle, and can directly perform acid-base titration. At the same time, the driving gas generated by the air compression pump is used to quickly blow all the carbon dioxide gas deposited in the reaction bottle out of the reaction bottle, avoiding inaccurate measurement of carbonate content caused by incomplete entry of carbon dioxide into the titration absorption bottle.

[0061] Therefore, the titration method can avoid the influence of atmospheric pressure, room temperature and reaction heat when using the gas volume method to determine the carbonate content in the soil, and can obtain reliable data results.

[0062] The utility model uses a non-aqueous titration method to determine the carbonate content in soil, and can solve the problem that the accuracy of the determination result is affected by factors such as atmospheric pressure, room temperature, reaction heat, etc. when the gas volume method is used for determination.

[0063] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for determining the carbonate content in soil, characterized in that: include: Magnetic stirrer (1); A reaction bottle (2), the reaction bottle (2) is placed on the magnetic stirrer (1), a magnetic stirrer (3) and a soil sample are placed in the reaction bottle (2), and a first rubber stopper (21) is installed on the bottle mouth of the reaction bottle (2); A separatory funnel (4), wherein the separatory funnel (4) contains a dilute hydrochloric acid solution, and a liquid outlet pipe (41) on the separatory funnel extends into the reaction bottle (2) through the first rubber stopper (21), and a liquid outlet valve (42) is provided on the liquid outlet pipe (41); A pressure gauge (5), the pressure gauge (5) being connected to a detection tube (6), the detection tube (6) extending into the reaction bottle (2) through the first rubber stopper (21); a gas outlet component (7), one end of which extends into the reaction bottle (2) through the first rubber stopper (21), and the other end of which is placed outside the reaction bottle (2), and a gas outlet switch (74) is provided on the gas outlet component (7); A titration absorption bottle (8), the titration absorption bottle (8) is fixed on a bracket (9), the interior of the titration absorption bottle (8) is connected to the other end of the gas outlet component (7), and a titration liquid dripping tube (10) is arranged at the top of the titration absorption bottle (8).

2. A device for measuring the carbonate content in soil according to claim 1, characterized in that: Also includes: An air compression pump (11), wherein the air outlet of the air compression pump (11) is connected to an air intake assembly (12), the tube end of the air intake assembly (12) away from the air compression pump (11) extends into the reaction bottle (2) through the first rubber stopper (21), and an air intake switch (124) is provided on the air intake assembly (12).

3. A device for measuring the carbonate content in soil according to claim 2, characterized in that: The air intake assembly (12) comprises: an air pipe (121), an air drying tower (122) and a first glass tube (123); one end of the air pipe (121) is connected to the air outlet of the air compression pump (11), and the other end is connected to the air inlet of the air drying tower (122); the air outlet of the air drying tower (122) is connected to one end of the first glass tube (123); the other end of the first glass tube (123) extends into the reaction bottle (2) through the first rubber stopper (21); and the first glass tube (123) is provided with the air intake switch (124).

4. A device for measuring the carbonate content in soil according to claim 3, characterized in that: The first glass tube (123) comprises: a first tube section (1231), a second tube section (1232) and a first connecting hose (1233); one end of the first tube section (1231) is connected to the air outlet of the air drying tower (122), and the other end is connected to one end of the first connecting hose (1233); the other end of the first connecting hose (1233) is connected to one end of the second tube section (1232); the other end of the second tube section (1232) extends into the reaction bottle (2) through the first rubber stopper (21); the air inlet switch (124) is a first water stopper clamped on the first connecting hose (1233).

5. A device for measuring the carbonate content in soil according to any one of claims 1 to 4, characterized in that: The gas outlet assembly (7) comprises: a second glass tube (71), a drying bottle (72), and a connecting assembly (73); one end of the second glass tube (71) extends into the reaction bottle (2) through the first rubber stopper (21), and the other end extends into the drying bottle (72) through a second rubber stopper (721) installed on the bottle mouth of the drying bottle (72); one end of the connecting assembly (73) extends into the drying bottle (72) through the second rubber stopper (721), and the other end is connected to the inside of the titration absorption bottle (8); the second glass tube (71) is provided with the gas outlet switch (74).

6. A device for measuring the carbonate content in soil according to claim 5, characterized in that: The connecting assembly (73) comprises: a third glass tube (731), a buffer bottle (732), and a fourth glass tube (733); one end of the third glass tube (731) extends into the drying bottle (72) through the second rubber stopper (721), and the other end extends into the buffer bottle (732) through a third rubber stopper (7321) installed on the bottle mouth of the buffer bottle (732); one end of the fourth glass tube (733) extends into the buffer bottle (732) through the third rubber stopper (7321), and the other end is connected to the interior of the titration absorption bottle (8).

7. A device for measuring carbonate content in soil according to claim 6, characterized in that: A porous glass baffle (13) is fixed inside the titration absorption bottle (8), and the other end of the fourth glass tube (733) is located below the porous glass baffle (13).

8. The device for measuring the carbonate content in soil according to claim 5, characterized in that: The second glass tube (71) comprises: a third tube section (711), a fourth tube section (712) and a second connecting hose (713); one end of the third tube section (711) extends into the reaction bottle (2) through the first rubber stopper (21), and the other end is connected to one end of the second connecting hose (713); the other end of the second connecting hose (713) is connected to one end of the fourth tube section (712), and the other end of the fourth tube section (712) extends into the drying bottle (72) through the second rubber stopper (721); the gas outlet switch (74) is a second water stopper clamped on the second connecting hose (713).

9. A device for measuring the carbonate content in soil according to any one of claims 1-4, 6-8, characterized in that: A waste liquid discharge pipe (14) is provided at the bottom end of the titration absorption bottle (8), and a waste liquid discharge valve (15) is provided on the waste liquid discharge pipe (14).

10. A device for measuring carbonate content in soil according to any one of claims 1-4, 6-8, characterized in that: The top of the titration absorption bottle (8) is provided with a waste gas discharge pipe (16).

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