CN216082497U

CN216082497U - Diffusion dish for soil alkaline hydrolysis nitrogen determination

Info

Publication number: CN216082497U
Application number: CN202121815396.7U
Authority: CN
Inventors: 陈建宇; 骆子璇; 胡海波
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-03-18
Anticipated expiration: 2031-08-04

Abstract

The utility model discloses a diffusion vessel for soil alkaline hydrolysis nitrogen determination, and belongs to the technical field of soil detection tools. The utility model is acid and alkali resistant, wear resistant and easy to clean, is not easy to damage compared with the traditional glass diffusion vessel, and can effectively reduce experiment loss; by arranging the separated inner chamber and the separated outer chamber, the soil sample can be independently taken out for soil sample weighing, solution filling and titration, the structure is simple, the operation is convenient, the test error caused by improper operation is avoided, the experimental efficiency and the accuracy can be improved, the experimental steps are simplified, and the method is suitable for measuring a large batch of soil samples; gas leakage can be effectively avoided; the bottom of the working groove adopts a fillet design, so that bubbles generated at corners due to the surface tension of plastic materials are effectively reduced, and the soil sample and the solution are fully reacted.

Description

Diffusion dish for soil alkaline hydrolysis nitrogen determination

Technical Field

The utility model belongs to the technical field of soil detection tools, and particularly relates to a diffusion vessel for soil alkaline hydrolysis nitrogen determination.

Background

The soil nitrogen supply capability is one of important indexes for evaluating soil fertility, wherein alkaline hydrolysis nitrogen comprises inorganic nitrogen and organic nitrogen, and is also called quick-acting nitrogen because the alkaline hydrolysis nitrogen can be absorbed and utilized by crops recently. In soil physicochemical property experiments of students, soil alkaline hydrolysis nitrogen is an important index. The method for measuring the soil alkaline hydrolysis nitrogen mainly comprises the step of treating soil with alkali liquor to convert organic nitrogen and ammonium nitrogen which are easy to hydrolyze into ammonia, and converting nitrate nitrogen into ammonium by ferrous sulfate. The content of the hydrolyzed nitrogen was calculated by absorbing ammonia with boric acid and titrating with a standard acid.

The standard method for measuring the soil hydrolyzable nitrogen in China at the present stage mainly adopts an alkaline hydrolysis diffusion method, and a measuring device of the method in a laboratory is mainly a ground diffusion vessel with a ground glass sheet, and the whole diffusion vessel main body is divided into an inner chamber and an outer chamber. In the experiment, a tested soil sample needs to be uniformly paved on an outer chamber of a diffusion dish, and then a boric acid indicator is added into an inner chamber; coating alkaline glue solution on the edge of the outer chamber, covering a frosted glass sheet, and rotating the frosted glass for several times to completely bond the edge of the diffusion vessel and the frosted glass; the ground glass was then slowly rotated to leak out of a slit where sodium hydroxide solution was rapidly added to the outer chamber of the diffusion dish, primarily for the purpose of treating the soil with lye. Then immediately using the ground glass cover to tightly seal, rotating the diffusion vessel to fully mix the external chamber solution and the tested soil sample, then using the rubber band to fix the ground glass, and moving the ground glass into a constant temperature box.

The diffusion dish that adopts in the experiment is glass diffusion dish mostly, and glass diffusion dish has following defect:

1. the glass diffusion vessel is high in price, heavy and easy to damage, and is not suitable for measuring a large batch of soil samples;

2. the sealing effect of the ground glass sheet and the glass diffusion vessel is poor, and the alkaline glue solution is not uniformly coated, so that air leakage is easily caused, and the experimental result is influenced;

3. when the alkaline glue solution is coated, the coating operation is complicated, samples are easily polluted, and the alkaline solution is difficult to clean and is stained in a vessel, so that experimental errors are easily caused;

4. the ground glass sheets need to be opened, closed and rotated for many times in the experimental process, the experimental efficiency is low, and the work division and cooperation are difficult;

5. after the liquid seal is carried out by using the alkaline glue, the ground glass sheet is not easy to be uncovered, and the sample liquid in the inner chamber and the outer chamber is easy to overturn, so that the pollution to the tested sample is caused;

6. the vessel body needs to be shaken for many times in the processes of soil sample weighing, solution filling and titration, and the inner chamber is easy to be polluted by the sample in the outer chamber.

In recent years, plastic diffusion vessels made of Polyethylene (PE) and polypropylene (PP) have been used in experiments, and at present, the plastic diffusion vessels have the following defects:

1. the existing plastic diffusion vessel upper cover and vessel body are only sealed by manually screwing a threaded port, so that the actual sealing effect is poor;

2. the inside diapire of plastics diffusion ware is mostly the right angle with the lateral wall junction, because of material surface tension, the solution back of annotating easily forms the bubble in soil sample.

SUMMERY OF THE UTILITY MODEL

The technical problem is as follows: aiming at the problems in the prior art, the utility model aims to solve the technical problem of providing a diffusion vessel for soil alkaline hydrolysis nitrogen determination, which is efficient and has good sealing effect.

The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

the diffusion vessel for measuring the soil alkaline hydrolysis nitrogen comprises a vessel cover, a vessel body and a base, wherein the vessel body is positioned in the base, and the vessel cover is detachably connected with the base.

Preferably, the utensil body comprises an outer chamber body and an inner chamber body, the outer chamber body is in a ring shape with a cylindrical through hole in the middle, an outer chamber working groove is formed in the outer chamber body, the inner chamber body is in a cylindrical shape with the inner chamber working groove, and the diameter of the bottom surface of the inner chamber body is smaller than that of the bottom surface of the through hole.

Preferably, the height of the inner chamber body is higher than the height of the outer chamber body.

Preferably, a fixed ring body is arranged in the base, and the outer diameter of the bottom surface of the fixed ring body is equal to the diameter of the bottom surface of the through hole.

Preferably, the junction of the side wall and the bottom wall of the outer chamber working groove is arc-shaped, and the junction of the side wall and the bottom wall of the inner chamber working groove is arc-shaped.

Preferably, the dish cover comprises a cover body and a sealing ring, and the cover body is provided with a sealing ring groove corresponding to the sealing ring.

Preferably, the dish cover is in threaded connection with the base.

Preferably, the dish body is made of polypropylene.

Has the advantages that: compared with the prior art, the utility model has the following advantages: 1. the diffusion vessel is integrally made of polypropylene (PP) materials, is acid-base resistant, wear resistant and easy to clean, is not easy to damage compared with the traditional glass diffusion vessel, and can effectively reduce experiment loss; 2. the diffusion vessel is provided with the separated inner chamber and the separated outer chamber, can be independently taken out for soil sample weighing, solution filling and titration, has a simple structure and convenient operation, avoids test errors caused by improper operation, can improve the experimental efficiency and accuracy, simplifies the experimental steps, and is suitable for measuring mass soil samples; 3. compared with the existing plastic diffusion vessel, the diffusion vessel has the advantages that the vessel cover is provided with the sealing groove, and the silicon rubber gasket is arranged in the sealing groove and matched with the spiral opening, so that gas leakage can be effectively avoided; 4. the bottom of the working tank adopts a fillet design, so that bubbles generated at corners due to the surface tension of plastic materials are effectively reduced, and the soil sample and the solution are fully reacted.

Drawings

FIG. 1 is an exploded view of the structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the capsule of the present invention;

FIG. 3 is a schematic cross-sectional view of the outer housing of the present invention;

FIG. 4 is a schematic cross-sectional view of the internal chamber body of the present invention;

figure 5 is a schematic cross-sectional view of a base of the present invention.

Detailed Description

The present invention will be further illustrated by the following specific examples, which are carried out on the premise of the technical scheme of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.

As shown in figure 1, a diffusion vessel for soil alkaline hydrolysis nitrogen determination comprises a vessel cover 1, a vessel body 2 and a base 3, wherein the vessel body 2 is positioned in the base 3, concave spiral lines are arranged on the vessel cover 1, corresponding convex spiral lines are arranged on the outer side of the base 3, the vessel cover 1 and the base 3 are detachably connected through threads (the vessel cover 1 and the base 3 can also be connected through other detachable modes such as a buckle), and the vessel body 2 can be taken out when the vessel cover 1 is opened. The dish body 2 comprises an outer chamber body 21 and an inner chamber body 22, the outer chamber body 21 is in a ring shape with a cylindrical through hole 211 in the middle, an outer chamber working groove 212 is formed in the outer chamber body 21, and the outer chamber working groove 212 is used for containing soil samples and filling sodium hydroxide solution; the inner chamber body 22 is cylindrical with an inner chamber working groove 221, the inner chamber working groove 221 is used for filling the boric acid indicator, the diameter of the bottom surface of the inner chamber body 22 is smaller than that of the bottom surface of the through hole 211, so that the inner chamber body 22 can be put in and taken out from the cylindrical through hole 211 of the outer chamber body 21, the height of the inner chamber body 22 is higher than that of the outer chamber body 21, and when the inner chamber body 22 and the outer chamber body 21 are put into the base 3 together, the taking-out is convenient due to the higher height of the inner chamber body 22.

As shown in fig. 1 and 5, a fixing ring body 31 is provided in the base 3, an outer diameter of a bottom surface of the fixing ring body 31 is equal to a diameter of a bottom surface of the through hole 211, and an inner diameter of a bottom surface of the fixing ring body 31 is equal to a diameter of a bottom surface of the inner chamber body 22, so that the fixing ring body 31 can fix the inner chamber body 22 and the outer chamber body 21 in the base 3.

As shown in fig. 2, the dish cover 1 includes a cover body 11 and a sealing ring 12, the cover body 11 is provided with a sealing ring groove 111 corresponding to the sealing ring 12, the sealing ring 12 can be made of silica gel, and when the cover body 11 is screwed down, the sealing ring 12 plays a good role in sealing, so as to avoid gas leakage.

As shown in fig. 3, the outer chamber working tank 212 is an annular body, and the joint of the side wall and the bottom wall of the outer chamber working tank is a round angle, so that bubbles generated at the corner due to the surface tension of the plastic material are effectively reduced, and the soil sample and the solution are fully reacted.

As shown in fig. 4, the inner chamber working groove 221 is cylindrical, and the joint of the side wall and the bottom wall is a round angle, which effectively reduces the generation of bubbles at the corner due to the surface tension of the plastic material.

The ware body 2 is made by polypropylene (PP) material, and acid and alkali-resistance, stand wear and tear, easy washing, and ware lid 1 and base 3 are made by polypropylene (PP) material, compare with traditional glass diffusion ware, and difficult damage reduces the experiment loss.

A using step;

the method comprises the following steps: 1.00g-2.00g (accurate to 0.01g) of air-dried soil sample which is sieved by a 2mm sieve is weighed and evenly paved in an outer chamber working groove 212 of an outer chamber body 21, and simultaneously 1g of zinc-ferrous sulfate reducing agent is added and paved on the soil sample.

Step two: 3.0mL of a 20g/L boric acid indicator solution was added to the inner chamber working tank 221 of the inner chamber body 22.

Step three: adding 10.0mL of 1.8mol/L sodium hydroxide solution into the outer chamber working groove 212, quickly putting the outer chamber body 21 and the inner chamber body 22 into the base 3 in sequence, then immediately covering the dish cover 1, forming a seal by manual rotary extrusion, and carefully rotating the whole diffusion dish to uniformly mix the soil sample and the sodium hydroxide solution.

Step four: placing in a thermostat, and culturing at 40 deg.C for 24 hr while intermittently and slightly rotating for 2-3 times to make the outer chamber fully react.

Step five: and taking out the whole diffusion dish after 24 hours, carefully taking out the inner chamber body 22, titrating the ammonia amount absorbed in boric acid of the inner chamber body 22 by using 0.01mol/L hydrochloric acid standard solution, slightly shaking the inner chamber body 22 during titration, and dipping the standard acid solution at the tip of the burette by using a glass rod when the solution is purple so as to prevent the solution from passing through the end point, wherein the color is changed from blue to purplish red, and the end point is reached.

Step six: and simultaneously carrying out reagent blank and standard soil sample measurement on the sample.

The data result analysis (see table 1) shows that, when 9 groups of soil samples are used for carrying out the control experiment, the volume test result of the sodium hydroxide solution consumed by titration without using a glass diffusion dish is taken as the true value and is basically consistent with the standard deviation and the relative standard deviation of the utility model, and the data result of the utility model is slightly superior to that of the brand new glass diffusion dish:

TABLE 1

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. The diffusion dish for measuring the soil alkaline hydrolysis nitrogen is characterized by comprising a dish cover (1), a dish body (2) and a base (3), wherein the dish body (2) is positioned in the base (3), and the dish cover (1) is detachably connected with the base (3).

2. The diffusion dish for soil alkaline hydrolysis nitrogen determination according to claim 1, wherein the dish body (2) comprises an outer chamber body (21) and an inner chamber body (22), the outer chamber body (21) is in a ring shape with a cylindrical through hole (211) in the middle, an outer chamber working groove (212) is formed in the outer chamber body (21), the inner chamber body (22) is in a cylindrical shape with an inner chamber working groove (221), and the diameter of the bottom surface of the inner chamber body (22) is smaller than that of the bottom surface of the through hole (211).

3. The diffusion dish for soil alkaline hydrolysis nitrogen measurement according to claim 2, wherein the height of the inner chamber body (22) is higher than the height of the outer chamber body (21).

4. The diffusion dish for soil alkaline hydrolysis nitrogen determination according to claim 2, wherein a fixed ring body (31) is provided in the base (3), and the outer diameter of the bottom surface of the fixed ring body (31) is equal to the diameter of the bottom surface of the through hole (211).

5. The diffusion dish for soil alkaline hydrolysis nitrogen determination according to claim 2, wherein a junction between the side wall and the bottom wall of the outer chamber working tank (212) is arc-shaped, and a junction between the side wall and the bottom wall of the inner chamber working tank (221) is arc-shaped.

6. The diffusion dish for soil alkaline hydrolysis nitrogen measurement according to claim 1, wherein the dish lid (1) comprises a lid body (11) and a seal ring (12), and the lid body (11) is provided with a seal ring groove (111) corresponding to the seal ring (12).

7. The diffusion dish for soil alkaline hydrolysis nitrogen determination according to claim 1, wherein the dish lid (1) is screwed to the base (3).

8. The diffusion dish for soil alkaline hydrolysis nitrogen measurement according to claim 1, wherein the dish body (2) is made of polypropylene.