Detection device for inorganic carbon in soil

Abstract

The utility model discloses a device for detecting inorganic carbon in soil, which relates to the technical field of soil detection, and comprises a reactor and a non-dispersive infrared detector, one end of the top of the reactor is connected with a gas inlet pipe, the end part of the gas inlet pipe is connected with a nitrogen cylinder, and one end of the middle part of the gas inlet pipe is provided with a pressure stabilizing valve; a flow stabilizing valve is arranged at the other end of the middle of the air inlet pipe. According to the device for detecting the inorganic carbon in the soil, through the arrangement of the nitrogen cylinder, after a sample is put into the reactor and is sealed, high-purity nitrogen is purged to remove original carbon dioxide in the reactor, and then diluted hydrochloric acid in the liquid storage tank is injected into the reactor by the hydrochloric acid pump, so that carbonate in the sample in the reactor and hydrochloric acid are subjected to oxidation reaction; wherein the carbon element is completely decomposed and oxidized into carbon dioxide, the carbon dioxide is condensed and dehydrated by an electronic condenser, then is dried by a Nafion drying tube, and then is detected by a non-dispersive infrared detector.

Description

Technical Field

[0001] The utility model relates to the technical field of soil detection, in particular to a detection device for inorganic carbon in soil. Background Technique

[0002] The soil carbon pool consists of two major parts: the organic carbon pool and the inorganic carbon pool. Organic carbon includes stable organic carbon and unstable organic carbon. According to the existing state, inorganic carbon in soil includes CO2 in the gas phase, liquid solutions rich in HCO3 and CO3, and carbon in the carbonate three-phase in solid form. However, under well-drained conditions and when the soil pH > 6.5, the amounts of gas-phase and liquid-phase inorganic carbon in the soil are negligible compared to the solid phase, and the solid phase is the main component of inorganic carbon in the soil.

[0003] Currently, the main methods for determining inorganic carbon in soil are the gas volume method, neutral titration method, and difference method. The gas volume method calculates by the volume of CO2 generated from the reaction of carbonate in the soil sample with hydrochloric acid. However, the volume of CO2 is greatly affected by temperature, air pressure, measurement methods, etc., resulting in a large error between the measurement result of the gas volume method and the actual value. The neutral titration method involves adding a standard acid to the soil for reaction and then titrating back the excess acid with a standard base, and calculating the content of inorganic carbon by the consumed base. However, due to the slow color change of the indicator, it is difficult to distinguish the titration end point, resulting in large measurement errors and poor repeatability. The difference method first uses an instrumental method to burn and determine the total carbon in the soil, then removes the inorganic carbon with acid, and measures the soil carbon content again. The content of inorganic carbon in the soil is obtained through the difference between the two measurements. The result of measuring inorganic salts in the soil by the difference method is relatively accurate, but the operation is cumbersome and the cost is high. It can be seen that the existing methods for determining the content of inorganic carbon in soil have problems such as requiring a large amount of samples, cumbersome operations, low accuracy of measurement results, and poor repeatability.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and deficiencies to provide a detection device for inorganic carbon in soil. Content of the Utility Model

[0005] The purpose of the utility model is to provide a detection device for inorganic carbon in soil to solve the problems raised in the above background technique.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for detecting inorganic carbon in soil, comprising a reactor and a non-dispersive infrared detector, wherein one end of the top of the reactor is connected to an air inlet pipe, and the end of the air inlet pipe is connected to a nitrogen bottle, one end of the middle of the air inlet pipe is provided with a pressure-stabilizing valve, and the other end of the middle of the air inlet pipe is provided with a flow-stabilizing valve, the rear end of the top of the reactor is connected to a liquid inlet pipe, and the end of the liquid inlet pipe is provided with a hydrochloric acid pump, and the bottom of the hydrochloric acid pump is connected to a liquid storage tank, the other end of the top of the reactor is connected to an exhaust pipe, and the end of the exhaust pipe is connected to an electronic condenser, one end of the top of the electronic condenser is connected to a halogen scrubber through a pipeline, and one end of the halogen scrubber is connected to a Nafion drying tube through a pipeline, the non-dispersive infrared detector is connected to the end of the Nafion drying tube, and a drainage pump is provided on one side of the electronic condenser.

[0007] Furthermore, a mixing assembly is provided at the bottom of the reactor, and the mixing assembly includes a spring seat and a base. The outer end of the bottom of the reactor is provided with a spring seat, and the bottom of the spring seat is connected to the base.

[0008] Furthermore, the mixing assembly also includes a motor and a transmission rod. The motor is placed in the center of the bottom of the base, and the top of the motor is connected to the transmission rod.

[0009] Furthermore, the transmission rod is in the shape of a hexagonal prism, and the center line of the transmission rod coincides with the center line of the reactor.

[0010] Furthermore, the mixing assembly further comprises a stirring shaft and a connecting plate, the stirring shaft is slidably connected to the outer side of the upper end of the transmission rod, and the connecting plate is fixed to the outer side of the lower portion of the transmission rod.

[0011] Furthermore, the stirring shaft is rotatably connected to the reactor, and the spring seats are equidistantly distributed around the bottom of the reactor.

[0012] Furthermore, the mixing assembly further includes a first magnet and a second magnet. The first magnet is disposed inside both ends of the connecting plate, and the second magnet is fixed to both ends of the bottom of the reactor.

[0013] Furthermore, the first magnet and the second magnet repel each other, and the first magnet and the second magnet are equal in size.

[0014] The utility model provides a device for detecting inorganic carbon in soil, which has the following beneficial effects:

[0015] 1. With the provision of a nitrogen cylinder, after placing the sample into the reactor and covering it, high-purity nitrogen is purged to remove the original carbon dioxide inside the reactor. Then, the hydrochloric acid pump injects dilute hydrochloric acid from the liquid storage tank into the reactor, causing the carbonate in the sample inside to undergo an oxidation reaction with hydrochloric acid. The carbon element therein is completely decomposed and oxidized into carbon dioxide. After the carbon dioxide is condensed and dehydrated by the electronic condenser, it is dried by the Nafion drying tube, and then detected by a non-dispersive infrared detector. The detector calculates the total inorganic carbon content in the soil sample by measuring the integral area of the CO2 concentration in the carrier gas. This method has the advantages of simple operation, small sample requirement, high data accuracy, and good repeatability;

[0016] 2. With the provision of a mixing component, during the reaction of dilute hydrochloric acid with the sample, the motor can be started, causing the transmission rod to drive the stirring shaft to rotate, thereby improving the reaction efficiency of dilute hydrochloric acid with the sample. Moreover, during the rotation of the transmission rod, it will also drive the connecting plate to rotate synchronously. When the first magnet aligns with the second magnet, the reactor is lifted by the repulsive force, and the vibration of the reactor is amplified by the spring seat, so that vibration mixing can also occur during the stirring process, making the reaction more efficient and sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall three-dimensional left view structural schematic diagram of a device for detecting inorganic carbon in soil according to the present utility model;

[0018] Figure 2 is the overall three-dimensional right view structural schematic diagram of a device for detecting inorganic carbon in soil according to the present utility model;

[0019] Figure 3 is the three-dimensional structural schematic diagram of the mixing component of a device for detecting inorganic carbon in soil according to the present utility model.

[0020] In the figure: 1. Reactor; 2. Air inlet pipe; 3. Nitrogen cylinder; 4. Pressure stabilizing valve; 5. Flow stabilizing valve; 6. Liquid inlet pipe; 7. Hydrochloric acid pump; 8. Liquid storage tank; 9. Exhaust pipe; 10. Electronic condenser; 11. Halogen scrubber; 12. Nafion drying tube; 13. Non-dispersive infrared detector; 14. Drainage pump; 15. Mixing component; 1501. Spring seat; 1502. Base; 1503. Motor; 1504. Transmission rod; 1505. Stirring shaft; 1506. Connecting plate; 1507. First magnet; 1508. Second magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0022] AsFigure 1 and Figure 2 As shown, a detection device for inorganic carbon in soil includes a reactor 1 and a non-dispersive infrared detector 13. One end of the top of the reactor 1 is connected to an air inlet pipe 2, and the end of the air inlet pipe 2 is connected to a nitrogen cylinder 3. First, high-purity nitrogen is purged into the reactor 1 to exclude the original carbon dioxide inside the reactor 1 to avoid affecting the detection accuracy. A pressure stabilizing valve 4 is provided at one end in the middle of the air inlet pipe 2, and a flow stabilizing valve 5 is arranged at the other end in the middle of the air inlet pipe 2. The rear end of the top of the reactor 1 is connected to a liquid inlet pipe 6, and a hydrochloric acid pump 7 is arranged at the end of the liquid inlet pipe 6. And the bottom of the hydrochloric acid pump 7 is connected to a liquid storage tank 8. The hydrochloric acid pump 7 injects the dilute hydrochloric acid inside the liquid storage tank 8 into the reactor 1, causing the carbonate in the internal sample to undergo an oxidation reaction with hydrochloric acid, and the carbon element therein is completely decomposed and oxidized into carbon dioxide. The other end of the top of the reactor 1 is connected to an exhaust pipe 9, and the end of the exhaust pipe 9 is connected to an electronic condenser 10. The electronic condenser 10 condenses and dehydrates the discharged gas. One end of the top of the electronic condenser 10 is connected to a halogen scrubber 11 through a pipe, and one end of the halogen scrubber 11 is connected to a Nafion drying tube 12 through a pipe. The Nafion drying tube 12 is used to improve the drying effect of the gas. The non-dispersive infrared detector 13 is connected to the end of the Nafion drying tube 12 and is detected by the non-dispersive infrared detector 13. The detector calculates the total inorganic carbon content in the soil sample by measuring the integral area of the carbon dioxide concentration in the carrier gas. A drain pump 14 is arranged on one side of the electronic condenser 10, and the drain pump 14 is used to discharge the sewage inside the electronic condenser 10.

[0023] As Figure 2 and Figure 3As shown, a mixing component 15 is provided at the bottom of the reactor 1. The mixing component 15 includes a spring seat 1501 and a base 1502. The outer ends of the bottom of the reactor 1 are all provided with spring seats 1501, and the bottom of the spring seat 1501 is connected to the base 1502. The spring seat 1501 is used to amplify the vibration of the reactor 1. The mixing component 15 further includes a motor 1503 and a transmission rod 1504. The motor 1503 is arranged at the center of the bottom of the base 1502, and the top of the motor 1503 is connected to the transmission rod 1504. The mixing component 15 further includes a stirring shaft 1505 and a connecting plate 1506. The stirring shaft 1505 is slidably connected to the outer side of the upper end of the transmission rod 1504, and the connecting plate 1506 is fixed to the outer side of the lower part of the transmission rod 1504. The transmission rod 1504 is hexagonal prism-shaped, and the center line of the transmission rod 1504 coincides with the center line of the reactor 1. When the transmission rod 1504 and the stirring shaft 1505 slide up and down, it will not affect the normal transmission. The stirring shaft 1505 is rotatably connected to the reactor 1, and the spring seats 1501 are evenly distributed in a circumferential manner about the bottom of the reactor 1. Starting the motor 1503 causes the transmission rod 1504 to drive the stirring shaft 1505 to rotate, so as to improve the reaction efficiency between the dilute hydrochloric acid and the sample. The mixing component 15 further includes a first magnet 1507 and a second magnet 1508. The first magnets 1507 are arranged inside both ends of the connecting plate 1506, and the second magnets 1508 are fixed to both ends of the bottom of the reactor 1. The first magnet 1507 and the second magnet 1508 repel each other, and the first magnet 1507 and the second magnet 1508 are of equal size. During the rotation of the transmission rod 1504, it will also drive the connecting plate 1506 to rotate synchronously. When the first magnet 1507 and the second magnet 1508 are aligned, the reactor 1 is driven to move upward by the repulsive force, so that vibration mixing can also be carried out during the stirring process, making the reaction more efficient and sufficient.

[0024] In summary, for the detection device of inorganic carbon in the soil, when in use, first according to Figure 1 、 Figure 2 and Figure 3In the structure shown in the figure, first, the sample is placed into the reactor 1. After the carbon dioxide in the reactor 1 is completely discharged, the reactor 1 is capped. Secondly, the pressure stabilizing valve 4 and the flow stabilizing valve 5 are opened, so that the nitrogen gas inside the nitrogen gas cylinder 3 enters the reactor 1 through the air inlet pipe 2, thereby completely discharging the internal carbon dioxide. And when the non-dispersive infrared detector 13 cannot detect carbon dioxide, the hydrochloric acid pump 7 is started to inject the dilute hydrochloric acid inside the liquid storage tank 8 into the reactor 1 through the liquid inlet pipe 6, so that the carbonate in the internal sample reacts with the hydrochloric acid. Then, the motor 1503 is started, so that the transmission rod 1504 drives the stirring shaft 1505 to rotate, to improve the reaction efficiency of the dilute hydrochloric acid and the sample. And during the rotation of the transmission rod 1504, it will also drive the connecting plate 1506 to rotate synchronously. When the first magnet 1507 and the second magnet 1508 are aligned, the reactor 1 is driven to move upward by the repulsive force, and the spring seat 1501 is used to amplify the vibration of the reactor 1, so as to vibrate and mix during the stirring process. Then, the generated carbon dioxide can enter the electronic condenser 10 through the exhaust pipe 9 for condensation and dehydration, and then undergoes halogen drying through the halogen scrubber 11 and the Nafion drying tube 12. After that, a standard curve between the infrared spectrum intensity value and the inorganic carbon content is established by using the non-dispersive infrared detector 13. By detecting the infrared spectrum intensity of the soil sample, the content of inorganic carbon in the soil is calculated. Finally, after the detection, the drain pump 14 can discharge the sewage inside the electronic condenser 10.

[0025] The embodiments of the present invention are given for purposes of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the present invention and its practical application, and to enable those of ordinary skill in the art to understand the present invention so as to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A device for detecting inorganic carbon in soil, comprising a reactor (1) and a non-dispersive infrared detector (13), characterized in that: One end of the top of the reactor (1) is connected to an air inlet pipe (2), and the end of the air inlet pipe (2) is connected to a nitrogen bottle (3), one end of the middle of the air inlet pipe (2) is provided with a pressure stabilizing valve (4), and the other end of the middle of the air inlet pipe (2) is provided with a flow stabilizing valve (5), the rear end of the top of the reactor (1) is connected to a liquid inlet pipe (6), and the end of the liquid inlet pipe (6) is provided with a hydrochloric acid pump (7), and the bottom of the hydrochloric acid pump (7) is connected to a liquid storage tank (8), the top of the reactor (1) is connected to a pressure stabilizing valve (4), and the other end of the middle of the air inlet pipe (2) is provided with a flow stabilizing valve (5), the rear end of the top of the reactor (1) is connected to a liquid inlet pipe (6), and the end of the liquid inlet pipe (6) is provided with a hydrochloric acid pump (7), and the bottom of the hydrochloric acid pump (7) is connected to a liquid storage tank (8), The other end of the electronic condenser (10) is connected to an exhaust pipe (9), and the end of the exhaust pipe (9) is connected to an electronic condenser (10). One end of the top of the electronic condenser (10) is connected to a halogen scrubber (11) through a pipeline, and one end of the halogen scrubber (11) is connected to a Nafion drying tube (12) through a pipeline. The non-dispersive infrared detector (13) is connected to the end of the Nafion drying tube (12). A drainage pump (14) is arranged on one side of the electronic condenser (10).

2. The device for detecting inorganic carbon in soil according to claim 1, characterized in that: A mixing assembly (15) is provided at the bottom of the reactor (1), and the mixing assembly (15) comprises a spring seat (1501) and a base (1502). The outer end of the bottom of the reactor (1) is provided with a spring seat (1501), and the bottom of the spring seat (1501) is connected to the base (1502).

3. The device for detecting inorganic carbon in soil according to claim 2, characterized in that: The mixing assembly (15) further comprises a motor (1503) and a transmission rod (1504). The motor (1503) is arranged at the center of the bottom of the base (1502), and the top of the motor (1503) is connected to the transmission rod (1504).

4. The device for detecting inorganic carbon in soil according to claim 3, characterized in that: The transmission rod (1504) is in the shape of a hexagonal prism, and the center line of the transmission rod (1504) coincides with the center line of the reactor (1).

5. The device for detecting inorganic carbon in soil according to claim 3, characterized in that: The mixing assembly (15) further comprises a stirring shaft (1505) and a connecting plate (1506), wherein the stirring shaft (1505) is slidably connected to the outer side of the upper end of the transmission rod (1504), and the connecting plate (1506) is fixed to the outer side of the lower portion of the transmission rod (1504).

6. The device for detecting inorganic carbon in soil according to claim 5, characterized in that: The stirring shaft (1505) is rotatably connected to the reactor (1), and the spring seats (1501) are equidistantly distributed around the bottom of the reactor (1).

7. The device for detecting inorganic carbon in soil according to claim 5, characterized in that: The mixing assembly (15) further comprises a first magnet (1507) and a second magnet (1508), wherein the first magnet (1507) is provided inside both ends of the connecting plate (1506), and the second magnet (1508) is fixed at both ends of the bottom of the reactor (1).

8. The device for detecting inorganic carbon in soil according to claim 7, characterized in that: The first magnet (1507) and the second magnet (1508) repel each other, and the first magnet (1507) and the second magnet (1508) are equal in size.

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