Diffusion vessel convenient for measuring nitrogen in soil
By dividing the diffusion dish into independent outer and inner chambers and employing a design with protrusions, bumps, and grooves, the problems of inaccurate titration endpoint observation and contaminant introduction in existing technologies are solved, thereby achieving accurate experimental results and simplifying operation.
Patent Information
- Application Number
- CN202422942874.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-01
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-01
AI Technical Summary
The existing diffusion dish is a one-piece molded structure, which makes it impossible to accurately observe the titration endpoint during the titration process. The volatilization of materials in the outer chamber affects the experimental results, and contaminants are easily introduced during the stirring process.
A diffusion dish consisting of an outer chamber and an inner chamber was designed. The outer chamber and the inner chamber are separated by a barrier wall. During titration, the outer chamber can be removed separately, leaving only the inner chamber for titration. The design of protrusions, bumps and grooves ensures a stable connection, and the barrier block prevents nitrogen from overflowing and avoids the outer chamber from affecting the experiment.
It enables accurate observation of the titration endpoint, reduces external contamination, ensures the accuracy and reliability of experimental results, avoids the influence of external volatiles, and simplifies the operation process.
Smart Images
Figure CN223770157U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of experimental equipment technology, specifically relating to a diffusion dish for facilitating the determination of nitrogen in soil. Background Technology
[0002] When determining hydrolyzable nitrogen in soil, the alkaline hydrolysis diffusion method is often used. The key point of this method is to treat the soil with a 1.8 mol / L sodium hydroxide solution. In a diffusion dish, the soil undergoes hydrolysis under alkaline conditions, converting easily hydrolyzable nitrogen into ammonium nitrogen through alkaline hydrolysis. After diffusion, the ammonium nitrogen is absorbed by boric acid solution and titrated with a standard acid to calculate the content of alkaline hydrolyzable nitrogen.
[0003] The specific steps of the experiment are as follows: Weigh out an air-dried soil sample and spread it evenly in the outer chamber of a diffusion dish. Add zinc-ferrous sulfate reducing agent to the soil sample in the outer chamber, and add boric acid-indicator solution to the inner chamber of the diffusion dish. Apply alkaline adhesive to the edge of the outer chamber of the diffusion dish, cover it with frosted glass, and rotate it several times to ensure that the frosted glass is completely adhered to the edge of the diffusion dish. Then, slowly rotate one side of the frosted glass to expose a narrow slit on one side of the diffusion dish. Add sodium hydroxide solution to the outer chamber of the diffusion dish in this slit, and immediately cover it tightly with frosted glass. Gently rotate the diffusion dish horizontally to fully mix the solution in the outer chamber with the soil sample. Then, use two rubber bands crossed in a cross shape to tighten the frosted glass and place it in a constant temperature incubator. After the incubation period, titrate the amount of ammonia absorbed by boric acid in the inner chamber with standard hydrochloric acid solution. During titration, use a fine glass rod to stir the solution in the inner chamber; do not shake the diffusion dish to avoid overflow.
[0004] In the titration process using hydrochloric acid standard solution, the sample in the outer chamber is no longer needed. However, existing diffusion dishes are integrally molded, making it impossible to separate the outer and inner chambers. This prevents researchers from accurately observing color changes during the titration process, thus affecting the determination of the titration endpoint. Simultaneously, the evaporation and diffusion of sodium hydroxide solution in the outer chamber and alkaline adhesive on the edge of the outer chamber can easily affect the titration process in the inner chamber, thus influencing the titration results. Furthermore, existing diffusion dishes require stirring the solution in the inner chamber with a thin glass rod during titration. This is also because the inner and outer chambers of existing diffusion dishes are integrally molded; shaking the diffusion dish causes the material in the outer chamber to spill out. Using a thin glass rod for stirring introduces contaminants from the glass rod, affecting the experimental results. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies and provide a diffusion dish that facilitates the determination of nitrogen (especially hydrolyzable nitrogen) in soil.
[0006] This utility model is achieved through the following technical solution:
[0007] A diffusion dish for facilitating the determination of nitrogen in soil comprises an outer chamber and an inner chamber. The outer chamber is formed by a container wall, an outer chamber bottom surface, and a barrier wall. The inner chamber is formed by an inner chamber bottom surface and a barrier wall. Both the container wall and the barrier wall are cylindrical and concentrically arranged. The bottom surface of the outer chamber is annular, and the bottom surface of the inner chamber is circular, with the bottom surfaces of the outer and inner chambers concentrically arranged. The outer and inner chambers are separated by a barrier wall. The barrier wall includes a front barrier wall and a rear barrier wall. The front barrier wall is integrally formed with the bottom surface of the outer chamber, and the rear barrier wall is integrally formed with the bottom surface of the inner chamber. The upper end of the front barrier wall is bent to form a protrusion, the width of which equals the thickness of the rear barrier wall. The height of the front barrier wall minus the height of the protrusion equals the height of the rear barrier wall. The height of the container wall minus the height of the barrier wall equals (1~2) cm.
[0008] Preferably, a protrusion is provided at the center of the bottom of the protrusion, and a groove is provided at the center of the top of the rear barrier wall, wherein the shape of the protrusion and the shape of the groove are the same.
[0009] Preferably, a blocking block is also provided on the side of the rear barrier wall near the inner chamber, and the blocking block is integrally formed with the rear barrier wall. The height of the blocking block is equal to the height of the barrier wall, and the thickness of the blocking block is 1-3mm.
[0010] Compared with the prior art, the present invention has the following beneficial effects:
[0011] 1. This invention, without altering the performance of existing diffusion dishes, divides a one-piece diffusion dish into two independent parts. Before titration with hydrochloric acid standard solution, the two parts are combined to form the existing diffusion dish. During titration with hydrochloric acid standard solution, the outer chamber, formed by the container wall, the bottom of the outer chamber, and the front barrier wall, is removed, leaving only the inner chamber, formed by the bottom of the inner chamber and the rear barrier wall. This prevents the outer chamber from obstructing accurate observation of the titration endpoint and avoids the evaporation and diffusion of sodium hydroxide solution in the outer chamber or alkaline adhesive on the edge of the outer chamber, which could affect the experimental results. Furthermore, since the outer chamber is removed, stirring with a fine glass rod is unnecessary during titration; simply shaking the inner chamber ensures a more complete and timely reaction, reducing external contamination and allowing for more accurate determination of the titration endpoint, thus ensuring accurate and reliable experimental results.
[0012] 2. The upper end of the front barrier wall of this utility model is bent to form a protrusion. The width of the protrusion is equal to the thickness of the rear barrier wall, and the height of the front barrier wall minus the height of the protrusion equals the height of the rear barrier wall. This design allows the front barrier wall and the protrusion to completely cover the rear barrier wall, so that when applying alkaline adhesive or adding sodium hydroxide solution, these two alkaline liquids will not adhere to the rear barrier wall, thereby further ensuring the accuracy of the experimental results.
[0013] 3. The height of the container wall minus the height of the barrier wall in this utility model is (1~2) cm. This structure ensures that after the frosted glass is covered, a channel with a height of 1~2 cm will be formed between the barrier wall and the frosted glass to facilitate diffusion.
[0014] 4. The protrusion at the bottom center of this utility model is further provided with a bump, and the top center of the rear barrier wall is further provided with a groove. The shape of the bump and the shape of the groove are consistent. The bump and the groove are matched one-to-one, and the number can be 1-5 sets. The design of the bump and the groove makes the connection between the bottom of the protrusion and the top of the rear barrier wall more stable. During the experiment, whether it is when applying alkaline glue to the edge of the diffusion dish, covering the frosted glass and rotating it several times, or when the frosted glass is completely adhered to the edge of the diffusion dish and then one side of the frosted glass is slowly turned off, or when the diffusion dish is gently rotated horizontally, the outer chamber will not slide relative to the inner part, thus making the experimental process closer to that of using existing diffusion dishes.
[0015] 5. The rear barrier wall of this utility model is also provided with a blocking block on the side near the inner chamber. The blocking block is integrally formed with the rear barrier wall. The height of the blocking block is equal to the height of the barrier wall. The thickness of the blocking block is 1-3mm. By setting the blocking block, the ammonium nitrogen diffused into the inner chamber can be prevented from overflowing from the gap between the front barrier wall and the rear barrier wall, so as to ensure the accuracy of the experimental results to the greatest extent.
[0016] 6. This utility model also features a simple structure, reasonable design, and convenient use. Using the diffusion dish of this utility model can better ensure the accuracy of experimental results and the efficiency of the experimental process. Attached Figure Description
[0017] Figure 1 This is a top view of the present invention;
[0018] Figure 2 This is a sectional view of AA.
[0019] Figure 3 and Figure 4 All are magnified schematic diagrams of point B.
[0020] In the diagram: 1-outer chamber, 2-container wall, 3-inner chamber, 4-barrier wall, 5-bottom surface of outer chamber, 6-bottom surface of inner chamber, 7-front barrier wall, 8-rear barrier wall, 9-protrusion, 10-bulge, 11-groove, 12-blocking block.
[0021] Figure 2 , Figure 3 , Figure 4 The gap between the front and rear barrier walls is for the purpose of more clearly illustrating the division between the equipment. In actual production, the gap is so small that it can be ignored. Detailed Implementation
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited by the embodiments.
[0023] Figure 2 , Figure 3 , Figure 4 The gaps between the front and rear barrier walls, the gaps between the protrusions and grooves, and the gaps between the blocking blocks and protrusions are all for the purpose of more clearly illustrating the division between the equipment. In actual production, these gaps are so small that they can be ignored. Example 1
[0024] like Figure 1 and Figure 2 As shown, a diffusion dish for easily determining nitrogen in soil consists of an outer chamber and an inner chamber. The outer chamber is formed by a container wall, an outer chamber bottom surface, and a barrier wall; the height difference between the container wall and the barrier wall is 1 cm. The inner chamber is formed by an inner chamber bottom surface and a barrier wall; the outer and inner chambers are separated by a barrier wall. The barrier wall is divided into a front barrier wall and a rear barrier wall; the front barrier wall is integrally formed with the outer chamber bottom surface, and the rear barrier wall is integrally formed with the inner chamber bottom surface. Both the container wall and the barrier wall are cylindrical and concentrically arranged; the bottom surface of the outer chamber is annular, and the bottom surface of the inner chamber is circular, with the bottom surfaces of the outer and inner chambers being concentrically arranged; the upper end of the front barrier wall is bent to form a protrusion, the width of which is equal to the thickness of the rear barrier wall, and the difference between the height of the front barrier wall and the height of the protrusion is equal to the height of the rear barrier wall.
[0025] Before the experiment, the outer and inner chambers are nested together to form a complete diffusion dish. A piece of air-dried soil sample is weighed and evenly spread in the outer chamber of the diffusion dish. Zinc-ferrous sulfate reducing agent is added to the outer chamber with the soil sample. Boric acid-indicator solution is added to the inner chamber of the diffusion dish. Alkaline adhesive is applied to the edge of the outer chamber of the diffusion dish. The frosted glass is then covered and rotated several times. During the rotation, in order to prevent the outer chamber from rotating relative to the inner chamber, the container wall needs to be manually controlled so that the frosted glass can be completely adhered to the edge of the diffusion dish.
[0026] Slowly rotate one side of the frosted glass. To prevent the outer chamber from rotating relative to the inner chamber, manual control of the container wall is still required. Once a narrow slit is exposed on one side of the diffusion dish, add sodium hydroxide solution into the outer chamber through this slit, and immediately cover it tightly with the frosted glass. Gently rotate the diffusion dish horizontally. Since rotating the dish is only to thoroughly mix the solution in the outer chamber with the soil sample, manual control of the container wall is not necessary; rotating only the outer chamber while keeping the inner chamber stationary is more beneficial for the experiment. After the solution and soil sample are thoroughly mixed, secure the frosted glass with two rubber bands crossed in a cross shape, and place it in a constant temperature incubator. After the heat preservation is completed, the amount of ammonia absorbed by boric acid in the inner chamber is titrated with standard hydrochloric acid solution. At this time, the outer chamber is separated from the inner chamber by removing part of the outer chamber from the diffusion dish, leaving only the inner chamber to be titrated. In this way, the titration endpoint will not be obstructed by the outer chamber, and the experimental results will not be affected by the volatilization and diffusion of sodium hydroxide solution in the outer chamber and alkaline adhesive on the edge of the outer chamber of the diffusion dish, thus ensuring the accuracy and reliability of the experimental results. Example 2
[0027] like Figures 1-3 As shown, the height difference between the container wall and the barrier wall is 3cm. A protrusion is provided at the center of the bottom of the protrusion, and a groove is provided at the center of the top of the rear barrier wall. The shape of the protrusion and the shape of the groove are the same. The rest is the same as in Embodiment 1.
[0028] The protrusions and grooves are matched one-to-one, and there are 5 sets in total. The design of the protrusions and grooves makes the connection between the bottom of the protrusion and the top of the rear barrier wall more stable. During the experiment, whether it was applying alkaline glue to the edge of the diffusion dish, covering the frosted glass and rotating it several times, or after the frosted glass was completely adhered to the edge of the diffusion dish and then slowly turning off one side of the frosted glass, or gently rotating the diffusion dish horizontally, the outer chamber did not slip relative to the inner part, thus making the experimental process closer to that of using existing diffusion dishes. Example 3
[0029] like Figures 1 to 4 As shown, the height difference between the container wall and the barrier wall is 2cm, the protrusions and grooves are matched one-to-one, and there is one set; the rear barrier wall is also provided with a blocking block on the side near the inner chamber. The blocking block is integrally formed with the rear barrier wall. The height of the blocking block is equal to the height of the barrier wall. The thickness of the blocking block is 1mm. The rest is the same as in Embodiment 2.
[0030] By setting up a blocking block, ammonium nitrogen diffused into the inner chamber can be prevented from leaking out through the gap between the front and rear blocking walls, thus maximizing the accuracy of the experimental results. Example 4
[0031] The protrusions and grooves are matched one-to-one, and there are 3 sets; the thickness of the blocking block is 3mm, and the rest is the same as in Example 3. Example 5
[0032] The protrusions and grooves are matched one-to-one, and there are 4 sets; the thickness of the blocking block is 2mm, and the rest is the same as in Example 3.
Claims
1. A diffusion cell for facilitating the determination of nitrogen in soil, consisting of an outer chamber and an inner chamber, characterised in that, The outer chamber is surrounded by the container wall, the outer chamber bottom surface and the barrier wall; the inner chamber is surrounded by the inner chamber bottom surface and the barrier wall; the container wall and the barrier wall are both cylindrical and concentrically arranged; the outer chamber bottom surface is annular, the inner chamber bottom surface is circular, and the outer chamber bottom surface and the inner chamber bottom surface are concentrically arranged; the outer chamber and the inner chamber are separated by the barrier wall; the barrier wall comprises a front barrier wall and a rear barrier wall, the front barrier wall is integrally formed with the outer chamber bottom surface, and the rear barrier wall is integrally formed with the inner chamber bottom surface.
2. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 1, wherein, The upper end of the front barrier wall is bent to form a protruding portion, and the width of the protruding portion is equal to the thickness of the rear barrier wall.
3. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 2, wherein, The height of the front barrier wall minus the height of the protruding portion is equal to the height of the rear barrier wall.
4. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 3, wherein The height of the container wall minus the height of the barrier wall is (1-2) cm.
5. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 4, wherein, A protruding portion is arranged on the bottom surface of the outer chamber, and a recess is arranged on the top surface of the inner chamber.
6. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 5, wherein, The barrier wall is provided with a blocking block near the inner chamber, and the blocking block is integrally formed with the barrier wall.
7. The diffusion cell for facilitating the determination of nitrogen in soil according to claim 6, wherein The height of the blocking block is equal to the height of the barrier wall, and the thickness of the blocking block is 1-3 mm.