Soil calcium carbonate measuring device

Abstract

The utility model discloses a soil calcium carbonate measuring device which comprises a reaction bottle, a three-way connector is connected to a bottle opening of the reaction bottle in a sealed mode, an acid burette capable of measuring is connected to the top of the three-way connector, and the side portion of the three-way connector is sequentially connected with a gas measuring pipe and a water level through connecting hoses. The device is simple in structure and convenient to operate, the acid burette connected to the outside of the reaction bottle 1 can realize accurate filling control of acid liquor, the reaction bottle with the ground surface is better in sealing performance when being connected with the three-way connector, carbon dioxide generated by reaction is prevented from leaking, measured data are more accurate, and the accuracy of soil calcium carbonate content measurement is ensured.

Description

Technical Field

[0001] This utility model relates to the field of calcium carbonate measurement, specifically to a soil calcium carbonate measuring device. Background Technology

[0002] The gas volume method is used to measure soil calcium carbonate. It mainly uses a measuring device to measure the volume of carbon dioxide produced by the reaction of carbonates and hydrochloric acid in the soil. Based on the density of carbon dioxide at a certain temperature and pressure (or by referring to the working curve), the mass of carbon dioxide is calculated and converted into the content of soil calcium carbonate.

[0003] In existing technologies, the gas volume method mainly adopts the People's Republic of China Forestry Industry Standard LY / T 1250—1999 for measurement (e.g.) Figure 3 As shown in the diagram, during the measurement, weigh 0.5–10.0 g of air-dried soil sample (containing approximately 0.05–0.4 g of calcium carbonate) that has passed through a 0.149 mm sieve and place it in reaction flask 1. Pour approximately 10 mL of 3 mol / L hydrochloric acid solution into a small, curved test tube 2 (with a small hole at the bend) fixed to the rubber stopper 3 at the flask opening. Then place the test tube into reaction flask 1, seal it tightly, and tilt the flask to allow the hydrochloric acid in the small test tube to be poured out in 2–3 portions to react with the sample. Shake the reaction flask thoroughly and record the final reading of the gas measuring tube. The difference between the final reading and the initial reading is the volume of carbon dioxide produced. However, because the hydrochloric acid is poured out in 2–3 portions during the measurement process, it is impossible to precisely control the volume each time. Furthermore, after prolonged use, the sealing contact surface of the rubber stopper 3 may compress and deform, causing localized air leakage. This results in inaccurate carbon dioxide measurement data and ultimately affects the measurement of soil calcium carbonate content. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a soil calcium carbonate measuring device.

[0005] This utility model is achieved through the following technical solution:

[0006] A soil calcium carbonate measuring device includes a reaction bottle with a three-way connector sealed at the bottle mouth. A burette capable of measuring is connected to the top of the three-way connector. The side of the three-way connector is connected to a gas measuring tube and a level via a connecting hose. The gas measuring tube and the level can be fixed by a support frame.

[0007] Further optionally, the three-way connector includes a connecting base that matches the mouth of the reaction flask, a straight pipe in the center of the connecting base that connects to the outlet of the acid burette, and a connecting hose on the side of the connecting base that is connected to the connecting base via a bypass vent pipe.

[0008] Alternatively, the outer side of the connecting base can be sealed to the mouth of the reaction flask via a sealing assembly.

[0009] Further optionally, the sealing assembly includes an annular sealing groove formed at the mouth of the reaction flask, and a sealing ring disposed on the outside of the connecting base is inserted into the annular sealing groove.

[0010] Alternatively, the annular sealing groove may be filled with sealing water.

[0011] Alternatively, a ground joint surface may be provided at the connection between the mouth of the reaction flask and the connecting base.

[0012] Alternatively, the connecting base, straight pipe, exhaust pipe, and sealing ring of the tee connector can be made of a single piece of glass.

[0013] Compared with existing technologies, the advantages of this utility model are: the utility model has a simple structure and is easy to operate. The acid burette connected to the outside of the reaction bottle 1 can achieve precise control of acid addition. Moreover, the reaction bottle with the ground glass joint has better sealing when connected to the three-way connector, avoiding leakage of carbon dioxide from the reaction, and the measured data is more accurate, ensuring the accuracy of soil calcium carbonate content measurement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of a local structure in the diagram;

[0016] Figure 3 This is a schematic diagram of the prior art of this utility model;

[0017] In the diagram: 1. Reaction flask; 2. Small test tube; 3. Rubber stopper; 4. Connecting hose; 5. Gas measuring tube; 6. Level; 7. Acid burette; 8. Three-way connector; 9. Connecting base; 10. Straight pipe; 11. Exhaust pipe; 12. Ground joint; 13. Annular sealing groove; 14. Sealing ring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1 As shown, a soil calcium carbonate measuring device includes a reaction bottle 1. The mouth of the reaction bottle 1 is sealed with a three-way connector 8. The top of the three-way connector 8 is connected to an acid burette 7 capable of measurement. Acid solution is directly added to the acid burette 7 from the outside. Precise control is achieved through the scale of the acid burette 7. The side of the three-way connector 8 is connected to a gas measuring tube 5 and a level 6 in sequence through a connecting hose 4. The gas measuring tube and the level 6 can be fixed by a support frame.

[0020] like Figure 2As shown, the three-way connector 8 includes a connecting base 9 that matches the mouth of the reaction flask 1. A straight pipe 10 connected to the outlet of the acid burette 7 is provided in the center of the connecting base 9. The side of the connecting base 9 is connected to the connecting hose 4 through a bypass exhaust pipe 11. The exhaust pipe 11 is connected to the external space of the straight pipe 10 to realize the discharge of carbon dioxide gas.

[0021] The outer side of the connecting base 9 is sealed to the mouth of the reaction flask 1 via a sealing assembly.

[0022] like Figure 2 As shown, the sealing assembly includes an annular sealing groove 13 opened at the mouth of the reaction flask 1. A sealing ring 14 disposed on the outside of the connecting base 9 is inserted into the annular sealing groove 13. The annular sealing groove 13 is filled with sealing water. The amount of water is small to prevent it from overflowing from the annular sealing groove 13. In this way, the annular sealing groove 13 and the sealing ring 14 achieve a water seal to prevent gas leakage and ensure the accuracy of carbon dioxide gas.

[0023] A ground joint surface 12 is provided at the connection between the mouth of the reaction flask 1 and the connecting base 9. This ground joint surface 12 can be coated with a sealing liquid (water or sealing oil). The ground joint surface 12 increases the friction between the reaction flask 1 and the connecting base 9, thus increasing the tightness of the fit between the mouth and the connecting base 9 and preventing it from loosening. Since it is less likely to loosen, the sealing performance is naturally good. Therefore, the ground joint glass bottle will fit very tightly, preventing reagents from escaping or air from entering, thus improving its sealing performance.

[0024] The connecting base 9, straight pipe 10, exhaust pipe 11, and sealing ring 14 of the three-way connector 8 are made of one piece of glass.

[0025] The implementation principle of the soil calcium carbonate measuring device in this application embodiment is as follows:

[0026] Weigh 0.5–10.0 g of air-dried soil sample (containing approximately 0.05–0.4 g of calcium carbonate) that has passed through a 0.149 mm sieve and place it in reaction flask 1 (250 mL conical flask). Insert the three-way connector 8 into the mouth of reaction flask 1 for sealing. During sealing, the sealing ring 14 of the sealing component is inserted into the liquid contained in the annular sealing groove 13 to achieve a water seal. Moreover, the connecting base 9 and the mouth of reaction flask 1 use a ground joint surface 12 with better sealing performance. This makes the overall sealing performance of the three-way connector 8 better and eliminates the risk of air leakage.

[0027] At the same time, use the connecting hose 4 to connect to the exhaust pipe 11 and the gas measuring pipe 5, so that the reaction bottle 1 and the gas measuring pipe 5 are connected to the outside. Use the acidic sealing liquid in the level 6 (250mL separatory funnel) to adjust the liquid level of the gas measuring pipe to be close to zero and record the initial reading.

[0028] A burette 7 containing 3 mol / L hydrochloric acid solution is connected to a straight tube 10 via a rubber hose. The stopcock valve at the outlet of the burette 7 is opened, allowing the acid solution in the burette 7 to enter the reaction flask 1 and react with the air-dried soil sample. As the acid solution falls with the stopcock valve open, the amount added is read by the change in the scale on the burette 7, achieving precise control of acid addition and making the reaction more stable. After a period of reaction, the carbon dioxide produced in the reaction flask 1 enters the gas measuring tube 5 until the liquid level in the gas measuring tube 5 stops falling within 1 minute. The final reading of the gas measuring tube 5 is recorded. The difference between the final reading and the initial reading is the volume of carbon dioxide produced, which is then used to calculate the soil calcium carbonate content. This method provides more accurate data and ensures the precision of soil calcium carbonate content measurement.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A soil calcium carbonate measuring device comprising a reaction bottle (1), characterised in that: The reaction bottle (1) is sealed and connected with a three-way connector (8) at the bottle mouth, the top of the three-way connector (8) is connected with a measurable acid burette (7), and the side of the three-way connector (8) is sequentially connected with a gas measuring tube (5) and a level (6) through a connecting hose (4).

2. A soil calcium carbonate measuring device according to claim 1, characterised in that: The three-way connector (8) comprises a connecting base (9) matched with the bottle mouth of the reaction bottle (1), a straight-through pipe (10) connected with the outlet of the acid burette (7) is arranged in the center of the connecting base (9), and the side of the connecting base (9) is connected with the connecting hose (4) through a bypass exhaust pipe (11).

3. A soil calcium carbonate measuring device according to claim 2, characterised in that: The outer side of the connecting base (9) is sealed and connected with the bottle mouth of the reaction bottle (1) through a sealing assembly.

4. A soil calcium carbonate measuring device according to claim 3, characterised in that: The sealing assembly comprises an annular sealing groove (13) opened in the bottle mouth of the reaction bottle (1), and a sealing insertion ring (14) arranged at the outer side of the connecting base (9) is inserted into the annular sealing groove (13).

5. A soil calcium carbonate measuring device according to claim 4, characterised in that: The annular sealing groove (13) is filled with sealing water.

6. A soil calcium carbonate measuring device according to claim 4, characterised in that: The bottle mouth of the reaction bottle (1) is provided with a ground surface (12) at the connecting position of the connecting base (9).

7. A soil calcium carbonate measuring device according to claim 2, characterised in that: The connecting base (9), the straight-through pipe (10), the exhaust pipe (11) and the sealing insertion ring (14) of the three-way connector (8) are made of integrated glass.

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