CN219434766U - Simple device for measuring soil calcium carbonate by gas flow method - Google Patents

Abstract

The utility model discloses a simple device for measuring soil calcium carbonate by gas volume method, which is characterized in that it comprises a flat-bottomed plastic finger tube (1), a conical bottle (2), a two-way piston (4), a glass straight tube (5 ), right-angled glass elbow (7), alkaline burette I (9), alkaline burette II (10), glass tee (12), flat-bottomed plastic finger tube 1 placed at the bottom of the Erlenmeyer flask (2), The mouth of the conical flask (2) is sealed with a rubber stopper A (3), on which a two-way piston (4) and a glass straight tube (5), an alkaline burette I (9) and an alkaline burette are inserted. The bottom end of the burette II (10) is connected to the two ends of the glass three-way pipe (12) through the latex tube, and the lower end of the glass three-way pipe (12) is connected to the latex tube B (13) equipped with glass beads. The upper end of the alkaline burette I (9) is sealed with a rubber stopper B (8), and the rubber stopper B (8) is inserted into the right-angle glass bend (7), and the right-angle glass bend (7) passes through the latex tube A (6) and Glass straight pipes (5) are connected. The structure of the invention is simple, easy to obtain and easy to operate.

Description

A Simple Device for Determination of Soil Calcium Carbonate by Air Volume Method

technical field

The utility model belongs to the technical field of soil detection, in particular to a simple device for measuring soil calcium carbonate by air volume method.

Background technique

The main component of carbonate in soil is calcium carbonate, which has a significant impact on soil pH, nutrient status, and soil colloidal properties. In soil analysis and testing work, this project is also the basis for selecting soil analysis methods.

At present, there are two main methods for soil calcium carbonate detection: volumetric titration and gas volumetric method. The volumetric titration method is to use an excess of standard acid to react with the soil sample, and then back-titrate the remaining acid with standard base. This method can only measure approximate results, and the amount of acid consumed cannot represent the real calcium carbonate content. The gas method is to calculate the calcium carbonate content by measuring the volume of _CO2 released after the acid reacts with the soil sample at a certain temperature and atmospheric pressure. However, the existing gas volume method for measuring calcium carbonate is relatively complicated, and the components are not easy to obtain, and some components even need to be customized, and for non-professional technicians, it is not easy to operate and not popular.

Contents of the invention

The purpose of this utility model is to overcome above-mentioned shortcoming and provide a kind of simple and easy-to-obtain, easy-to-operate air volume method to measure the simple and easy device of soil calcium carbonate.

The utility model relates to a simple device for measuring soil calcium carbonate by gas volume method, which includes a flat-bottomed plastic finger tube, a conical flask, a two-way piston, a glass straight tube, a right-angle glass curved tube, an alkaline burette I, an alkaline burette II, Glass three-way tube, in which: a flat-bottomed plastic finger tube is placed at the bottom of the conical flask, the mouth of the conical flask is sealed with a rubber stopper A, and a two-way piston and a glass straight tube are inserted into the rubber stopper A, the alkaline burette I and alkali The bottom end of the type burette II is connected to the two ends of the glass tee through a latex tube, the lower end of the glass tee is connected to the latex tube B equipped with glass beads, and the rubber stopper B used for the upper end of the alkaline burette I Airtight, the rubber plug B is inserted into the right-angle glass elbow, and the right-angle glass elbow is connected to the glass straight pipe through the latex tube A.

The above-mentioned gas volume method measures the simple and easy device of soil calcium carbonate, wherein: described right angle glass bend pipe, latex pipe A and glass straight pipe are replaced with U-shaped glass pipe.

The above-mentioned simple device for measuring soil calcium carbonate by air volume method, wherein: the glass beads of the latex tube B are replaced by water-stop clips.

The above-mentioned simple device for measuring soil calcium carbonate by air volume method, wherein: the basic burette I and the basic burette II are fixed on the burette frame.

Compared with the prior art, the utility model has obvious beneficial effects. It can be seen from the above technical solutions that the latex tube B of the utility model has a built-in glass bead for controlling the flow velocity and flow rate of the liquid. The two-way piston is opened and closed to adjust the communication or isolation of the reaction system with the outside air. The parts of the utility model are common standard parts, simple in structure, easy to operate, and can be used by non-professional technicians.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Marked in the picture:

1. Plastic finger tube with flat bottom; 2. Erlenmeyer flask; 3. Rubber stopper A; 4. Two-way piston; 5. Glass straight tube; 6. Latex tube A; ; 9. Basic burette Ⅰ; 10. Basic burette Ⅱ; 11. Burette rack; 12. Glass three-way tube; 13. Latex tube B.

Detailed ways

Below in conjunction with accompanying drawing and preferred embodiment, to the specific embodiment, structure, feature and effect thereof of the simple and easy device of a kind of air volume method that the present invention proposes to measure soil calcium carbonate, be described in detail as follows.

The utility model relates to a simple device for determining soil calcium carbonate by gas volume method, which comprises a flat-bottomed plastic finger tube 1, a conical flask 2, a two-way piston 4, a glass straight tube 5, a right-angle glass bend tube 7, an alkaline burette I9, Alkaline burette II 10, glass tee pipe 12, wherein: flat-bottomed plastic finger tube 1 is placed at the bottom of conical flask 2, and the mouth of conical flask 2 is sealed with rubber stopper A3, on which two-way piston 4 and The glass straight tube 5, the alkaline burette I9 and the alkaline burette II10 are fixed on the burette frame 11, and the bottom ends of the two are connected to the two ends of the glass tee pipe 12 through the latex tube, and the lower end of the glass tee pipe 12 is connected to the The latex tube B13 equipped with glass beads is connected to control the flow rate and flow rate of the liquid. The upper end of the alkaline burette I9 is sealed with a rubber plug B8. The rubber plug B8 is inserted into the right-angle glass bend 7, and the right-angle glass bend 7 passes through Latex tube A6 is connected with glass straight tube 5.

The right-angled glass elbow 7 is connected to the glass straight tube 5 on the Erlenmeyer flask 2 through the latex tube A6, and this part of the assembly can be replaced by a U-shaped glass tube.

The glass beads of the latex tube B13 can be replaced by water-stop clips.

Working principle: Check the airtightness of the utility model before use to ensure that it does not leak; inject 0.5mol/L sulfuric acid colored solution (adding methyl red indicator) from the upper part of the basic burette II10, and wait for the basic burette II10 and After the liquid level of the alkaline burette I9 is level, read the scale on the alkaline burette I9; weigh the soil sample in the Erlenmeyer flask 2, moisten the soil sample with a small amount of water, and put 10.00ml of 1:3 hydrochloric acid The flat-bottomed plastic finger tube 1 is clamped with V-shaped long tweezers and gently put into the bottom of the Erlenmeyer flask 2; the Erlenmeyer flask 2 is sealed with a rubber stopper A3, and the two-way piston 4 is closed (isolated from the outside air). Tilt the Erlenmeyer flask 2 to let a small amount of hydrochloric acid in the flat-bottomed plastic finger tube 1 flow out to prevent the reaction from being too violent. Mix and shake well, and at the same time drain slowly through the glass beads in the latex tube B13; when the drop rate of the liquid level in the alkaline burette I9 is less than 0.5ml. Stop shaking at min ^-1 , stop draining when the liquid level in the alkaline burette II drops to the same level as that in the alkaline burette I, and read the scale number on the alkaline burette I immediately.

When the soil sample is measured, a calcium carbonate standard substance should be inserted into every 5 samples as a reference, that is, 0.15g (accurate to 0.001g) of anhydrous calcium carbonate is weighed in the conical flask 1, and the remaining operation steps are the same as that of the sample. Determination.

The specifications and volume of the Erlenmeyer flask must be consistent for each measurement.

At a certain temperature and atmospheric pressure, measure calcium carbonate standard substance and soil sample at the same time, according to the volume of carbon dioxide produced by a certain amount of calcium carbonate standard substance, and compare it with the volume of carbon dioxide produced by the soil sample, the amount of carbon dioxide in the soil sample can be calculated. Contains the equivalent of calcium carbonate.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Any modifications made to the above embodiments according to the technical essence of the present utility model do not deviate from the content of the technical solution of the present utility model. Any simple modifications, equivalent changes and modifications still belong to the scope of the technical solution of the present utility model.

Claims (4)

1. A simple device for measuring soil calcium carbonate by air volume method, characterized in that: it comprises a flat-bottomed plastic finger tube (1), a Erlenmeyer flask (2), a two-way piston (4), a glass straight tube (5), a right-angled Glass elbow (7), alkaline burette I (9), alkaline burette II (10), glass tee (12), flat-bottomed plastic finger (1) placed at the bottom of the Erlenmeyer flask (2), conical The bottle mouth of the shaped bottle (2) is sealed with a rubber stopper A (3), and the two-way piston (4) and glass straight tube (5), alkaline burette I (9) and alkaline burette are inserted into the rubber stopper A (3). Ⅱ (10) The nozzle at the bottom end is connected to the two ends of the glass tee pipe (12) through the latex tube, and the lower end of the glass tee pipe (12) is connected to the latex tube B (13) equipped with glass beads. The rubber plug B (8) used for the upper end of the type burette I (9) is airtight, and the rubber plug B (8) is inserted into the right-angle glass elbow (7), and the right-angle glass elbow (7) passes through the latex tube A (6) and the glass Straight pipes (5) are connected. 2. The simple device for measuring soil calcium carbonate by air volumetric method as claimed in claim 1, characterized in that: said right-angled glass elbow (7), latex tube A (6) and glass straight tube (5) use U-shaped glass tube replacement. 3. The simple device for determining soil calcium carbonate by air volume method according to claim 1, characterized in that: the glass beads of the latex tube B (13) are replaced by water-stop clips. 4. The simple device for measuring soil calcium carbonate by air volume method according to claim 1, characterized in that: the basic burette I (9) and the basic burette II (10) are fixed on the burette holder (11).