JP6924344B1 - Preparation equipment and method for solid waste soil leachate in pesticide pesticide production areas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a drawback that the extraction process of a leachate extraction device is complicated and the extraction is incomplete, the test results vary widely, and the purity of the leachate and the thoroughness of extraction affect the accuracy of the experiment. give. The present invention relates to a technical field of soil pot detection, specifically, an apparatus and a method for preparing a solid waste soil leachate in a pesticide pesticide production area, wherein the preparation apparatus of the present invention is a condensation tank and the condensation. Including an evaporation mechanism provided above the tank, the condensation tank is connected via an evaporation mechanism and a steam press mechanism, and the preparation method of the present invention is a soil sample to be measured using a high pressure steam jet flow melting method. Not only can the composition to be extracted in the soil sample be uniformly and sufficiently dissolved by dissolving and extracting the pesticide pesticide inside, but also the temperature of the high-pressure steam is effectively secured, and the composition to be extracted is high. Prevents decomposition by and ensures the accuracy of detection experiments. [Selection diagram] Fig. 1

Description

The present invention relates to the technical field of soil pit detection, and specifically to a device and method for preparing a solid waste soil leachate in an insecticide pesticide production area.

In experiments to measure soil toxicity in pesticide pesticide production areas, it is necessary to extract soil exudate,
Currently, the extraction process of a leachate extractor has the disadvantage that the extraction process is complicated and the extraction is incomplete, the test results vary widely, and the purity of the leachate and the thoroughness of extraction affect the accuracy of the experiment. give.

In order to achieve the above object, the present invention provides a device for preparing a solid waste soil leachate in a pesticide pesticide production area, a corresponding usage method designed according to the device, and has low impurities and high yield. The soil exudate is prepared and the specific technical solution is as follows.

1. Soil leachate preparation device The solid waste soil leachate preparation device for the pesticide pesticide production area designed by the present invention includes a condensing tank and an evaporation mechanism provided above the condensing tank.
In the evaporation mechanism, a solvent evaporator and a water evaporator are sequentially provided in the circumferential direction with the central axis as the center, and a second heating plate and a second heat transfer plate are provided inside the solvent evaporator. Is provided, a solvent vapor conduit is communicated to the outside, a first heating plate and a first heat transfer plate are provided inside the water evaporator, and a steam conduit is communicated to the outside.
A steam press mechanism is provided at the center of the top of the condensation tank, and a condensing plate extending in a spiral shape is provided on the inner wall of the condensing tank corresponding to the position of the steam press mechanism to condense the position corresponding to the position of the steam press mechanism. A condensing tube is provided on the outer wall of the tank,
The vapor press mechanism includes a sample container with a vapor exhaust hole, a liquid collection cover having a vapor ring column inserted at the top of the sample container and a through hole hollowed out in the center of the cone-shaped bottom of the sample container. Is connected.
A steam microhole is provided on the surface of the steam ring column, a secondary heating column is provided on the central axis, and a seal ring cover is provided on the top to communicate with the steam conduit and the solvent steam conduit.
After the leachate condensed on the bottom of the sample container is collected by the liquid collection cover, it flows into the solution outlet tube provided in the center of the bottom of the condensing tank along the guide strip provided on the lower edge of the condensing plate and provided with the guide cover. do.
The leachate that has slipped off the guide strip is collected by an annular guide shell provided outside the solution outlet tube, and then flows into the annular guide tube.

As one aspect of the present invention, a support base is provided below the condensing tank, a support plate is provided above, and a support ring connected to the support base via a support column is provided on the outside of the support ring. A support hydraulic cylinder is provided at the top, and the top of the hydraulic rod in the support hydraulic cylinder is fixedly connected to the bottom of the support plate.
As one aspect of the present invention, a movable seal cover is provided at the top of the sample container, an annular sample push plate fitted to the steam ring column is provided inside the sample container, and the steam conduit of the steam ring column and the steam conduit of the steam ring column are provided. A solvent communication ring is provided at the connection with the solvent vapor conduit.

As one aspect of the present invention, an outer seal ring is provided on the outer wall of the sample container which is flush with the movable seal cover, an outer seal ring groove is provided at the lower end of the outer seal ring, and the outer side is provided on the top of the condensing tank. A tightly restrained seal fit ring is provided in the seal ring groove.

As one aspect of the present invention, a first constant pressure valve, a first electric control valve and a first air pressure sensor are provided on the water evaporator, and a second constant pressure valve and a second constant pressure valve are provided on the solvent evaporator. An electric control valve and a second air pressure sensor are provided.

As one aspect of the present invention, a steam pipe fixing hole is provided on the support plate.

As one aspect of the present invention, a pressure release valve is fixedly provided on the top of the condensation tank, a condensation protection shell for covering the condensation tube is provided on the outer wall of the condensation tank, and the inner wall of the condensation tank is hydrophobically resistant. The wear coat layer is plated.

As one aspect of the present invention, an inner sealing ring is provided at the lower end of the inner wall of the movable seal cover, and the inner sealing ring is extended downward so as to be lower than the lower end of the movable seal cover.
An inner sealing ring groove provided with a sealing ring is provided on the outer surface of the inner sealing ring.

2. Method for preparing soil leachate The method for preparing soil leachate designed by the present invention is as follows.
S1, the step of drying the soil pot sample at a low temperature of 30 to 45 ° C., crushing it into powder, and filtering and removing the particles of gravel weeds.
S2, the step of putting the treated earthenware sample into the sample container, pushing the steam ring column into the sample container, and firmly pressing the sample top with the annular sample push plate.
S3, pure water is injected into the water evaporator, and a mixed solution is injected into the solvent evaporator. The mixed solution contains alcohol having a mass concentration of 50 to 95% and acetone having a mass concentration of 10 to 20%. A step composed of being mixed at a mass ratio of 1 and
S4, the first heating plate and the second heating plate are started and heated, and the pressure in the water evaporator is 0.18.
The step of controlling the pressure in the solvent evaporator to 0.14 to 0.16 MPa by controlling the pressure to ~ 0.22 MPa, and the step of controlling the pressure in the solvent evaporator to 0.14 to 0.16 MPa.
S5, First, open the first electric control valve of the water evaporator, and put high-pressure steam in the sample container for 10 to 15
The step of venting the evaporative solvent into the sample container by opening the second electric control valve of the solvent evaporator after min aeration,
S6, a step of mixing high-pressure steam and an evaporation solvent and aerating the sample container for 30 to 45 minutes, at which time controlling the temperature of the sample container to 75 to 85 ° C.
S7, the step of closing the second electric control valve and the first electric control valve in sequence and cooling for 15 to 20 minutes, and
S8 includes a step of collecting the exudate discharged from the outer drainage pipe and the outlet drainage pipe, allowing it to stand and centrifuging to obtain a supernatant, and obtaining an exudate satisfying the standard.

Compared with the conventional soil exudate preparation device, the beneficial effects of the present invention are as follows.
The present invention can extract the pesticide pesticide dissolution in the soil sample to be measured by using the high-pressure steam jet flow dissolution method, and can uniformly and sufficiently dissolve the extraction composition in the soil sample at high efficiency and high speed. Instead, the temperature of the high-pressure steam is well controlled so that the extraction composition is not decomposed by the high temperature to ensure the accuracy of the detection experiment.

It is a front view of this invention. It is a top view of FIG. FIG. 1 is a cross-sectional view taken along the line AA of FIG. FIG. 1 is a partial view B of FIG. FIG. 1 is a partial view C of FIG. FIG. 1 is a partial view D of FIG. FIG. 1 is a partial view E of FIG.

[Explanation of code]
10 Support base 11 Support ring 12 Support column 13 Support hydraulic cylinder 14 Support plate 141 Steam pipe fixing hole 20 Condensing tank 201 Sample storage fixing hole 202 Seal fit ring 21 Condensing plate 22 Condensing protection shell 23 Condensing tube 24 Circular guide shell 25 Circular guide Pipe 251 Outer liquid drain pipe 26 Liquid outlet pipe 261 Derived liquid drain pipe 27 Guide cover 271 Guide cover through hole 28 Guide strip 29 Pressure relief valve 30 Steam press mechanism 31 Sample container 311 Steam exhaust hole 32 Movable seal cover 33 Steam ring column 331 Seal ring cover 332 Vapor entry port 333 Steam fine hole 34 Secondary heating column 35 Circular sample push plate 36 Solvent communication ring 361 Solution entry port 37 Liquid collection cover 371 Hollow through hole 38 Inner seal ring 381 Inner seal ring groove 39 Outer seal Ring 391 Outer seal Ring groove 40 Evaporation mechanism 41 Water evaporator 411 First heating plate 412 First heat transfer plate 413 Steam discharge port 414 First air pressure sensor 415 First constant pressure valve 42 Solvent evaporator 421 Second Heating plate 422 Second heat transfer plate 423 Solvent discharge port 424 Second air pressure sensor 425 Second constant pressure valve 43 Steam conduit 431 First electric control valve 44 Solvent steam conduit 441 Second electric control valve

In order to further illustrate the methods and effects achieved by the present invention, the technical solutions of the present invention will be described below clearly and completely in conjunction with the accompanying drawings.

Example 1
Example 1 mainly describes the specific structure of the soil leachate preparation device designed by the present invention, and the specific contents are as follows.
As shown in FIG. 1, the device for preparing the solid waste soil leachate in the pesticide pesticide production area designed by the present invention includes a condensing tank 20 and an evaporation mechanism 4 provided above the condensing tank 20.
Includes 0.

As shown in FIG. 4, in the evaporation mechanism 40, a solvent evaporator 42 and a water evaporator 41 are sequentially provided in the circumferential direction along the radial direction about the central axis, and a second solvent evaporator 42 is provided inside the solvent evaporator 42. A heating plate 421 and a second heat transfer plate 422 are provided, and a solvent vapor conduit 44 is communicated to the outside.
A first heating plate 411 and a first heat transfer plate 412 are provided inside the water evaporator 41.
The steam conduit 43 is communicated to the outside.
As shown in FIG. 1, a steam press mechanism 30 is provided at the center of the top of the condensation tank 20, and a condensing plate 21 extending spirally is provided on the inner wall of the condensation tank 20 corresponding to the position of the steam press mechanism 30. A condensing tube 23 is provided on the outer wall of the condensing tank 20 corresponding to the position of the steam press mechanism 30.
The steam press mechanism 30 includes a sample container 31 provided with a steam exhaust hole 311, and a steam ring column 33 is inserted into the top of the sample container 31, and a hollow through hole is formed in the center of the cone-shaped bottom of the sample container 31. A liquid collection cover 37 with 371 is connected.
A steam microhole 333 is provided on the surface of the steam ring column 33, a secondary heating column 34 is provided on the central axis, and a seal ring cover 331 is provided on the top thereof to communicate with the steam conduit 43 and the solvent steam conduit 44.
After the leachate condensed from the bottom of the sample container 31 is collected by the liquid collection cover 37, the guide cover 27 is provided at the center of the bottom of the condensing tank 20 along the guide strip 28 provided on the lower edge of the condensing plate 21. It flows into the solution outlet pipe 26.
The leachate that has slipped off the guide strip 28 is collected by the annular guide shell 24 provided outside the solution outlet pipe 26, and then flows into the annular guide pipe 25.
Specifically, a support base 10 is provided below the condensation tank 20, and a support plate 14 is provided above.
Is provided, and the support ring 11 is connected to the support base 10 via the support column 12 on the outside.
Is provided, a support hydraulic cylinder 13 is provided at the top of the support ring 11, and the top of the hydraulic rod in the support hydraulic cylinder 13 is fixedly connected to the bottom of the support plate 14.
Specifically, a movable seal cover 32 is provided on the top of the sample container 31, and an annular sample push plate 35 fitted in the steam ring column 33 is provided inside the sample container 31, and the steam ring column 33 is provided. A solvent communication ring 36 is provided at a connection portion between the steam conduit 43 and the solvent vapor conduit 44.

Specifically, with reference to FIG. 5, an outer seal ring 39 is provided on the outer wall of the sample container 31 which is flush with the movable seal cover 32, and an outer seal ring groove 391 is provided at the lower end of the outer seal ring 39. The outer seal ring groove 391 is formed on the top of the condensation tank 20.
A tightly constrained seal fit ring 202 is provided inside.
Specifically, a first constant pressure valve 415, a first electric control valve 431, and a first air pressure sensor 414 are provided on the water evaporator 41, and a second constant pressure valve 425 is provided on the solvent evaporator 42. ,
A second electrical control valve 441 and a second air pressure sensor 424 are provided.
Specifically, the steam pipe fixing hole 141 is provided on the support plate 14.
Specifically, a pressure release valve 29 is fixedly provided on the top of the condensation tank 20, a condensation protection shell 22 for covering the condensation tube 23 is provided on the outer wall of the condensation tank 20, and an inner wall of the condensation tank 20 is provided. Is plated with a hydrophobic wear-resistant coat layer.
Specifically, an inner sealing ring 38 is provided at the lower end of the inner wall of the movable seal cover 32.
The inner sealing ring groove 381 is extended downward so that the inner sealing ring 38 is lower than the lower end of the movable seal cover 32, and the inner sealing ring 38 is provided with a sealing ring on the outer surface.
Is provided.

Example 2
Example 2 is based on the preparation apparatus described in Example 1, and an object of the present invention is to explain a method for preparing a soil leachate designed by the present invention.
The method of soil exudate preparation designed by the present invention is:
S1, the step of drying the soil pot sample at a low temperature of 30 ° C., crushing it into powder, and filtering and removing the particles of gravel weeds.
S2, a step of putting the treated earthenware sample into the sample container 31, pushing the steam ring column 33 into the sample container 31, and firmly pressing the top of the sample with the annular sample push plate 35.
S3, pure water is injected into the water evaporator 41, and a mixed solution is injected into the solvent evaporator 42. The mixed solution contains 5: 1 alcohol having a mass concentration of 50% and acetone having a mass concentration of 10%. And the steps that are mixed in the mass ratio of
S4, the first heating plate 411 and the second heating plate 421 are started and heated, the pressure in the water evaporator 41 is controlled to 0.18 MPa, and the pressure in the solvent evaporator 42 is controlled to 0.14 MPa. Steps to do and
S5, First, the first electric control valve 431 of the water evaporator 41 is opened, high-pressure steam is ventilated into the sample container 31 for 10 minutes, then the second electric control valve 441 of the solvent evaporator 42 is opened, and the sample container 31 is opened. With the step of aerating the evaporative solvent inside,
S6, a step of mixing high-pressure steam and an evaporation solvent and aerating the sample container 31 for 30 minutes, at which time controlling the temperature of the sample container 31 to 75 ° C.
S7, a step of sequentially closing the second electric control valve 441 and the first electric control valve 431 and cooling for 15 minutes,
S8 includes a step of collecting the exudate discharged from the outer drainage pipe 251 and the lead drainage pipe 261 and allowing it to stand and centrifuge to obtain a supernatant to obtain a leachate that meets the standards.

Example 3
Example 3 is based on the preparation method described in Example 2, and mainly describes the preparation method under different different parameters.
The method of preparing the soil leachate under another parameter designed by the present invention is:
S1, the step of drying the soil pot sample at a low temperature of 45 ° C., crushing it into powder, and filtering and removing the particles of gravel weeds.
S2, a step of putting the treated earthenware sample into the sample container 31, pushing the steam ring column 33 into the sample container 31, and firmly pressing the top of the sample with the annular sample push plate 35.
S3, pure water is injected into the water evaporator 41, and a mixed solution is injected into the solvent evaporator 42. The mixed solution has a mass ratio of alcohol having a mass concentration of 95% and acetone having a mass concentration of 20% in a mass ratio of 5: 1. Steps that are mixed in proportion and
S4, the first heating plate 411 and the second heating plate 421 are started and heated to control the pressure in the water evaporator 41 to 0.22 MPa and the pressure in the solvent evaporator 42 to 0.16 MPa. death,
S5, First, the first electric control valve 431 of the water evaporator 41 is opened, high-pressure steam is ventilated into the sample container 31 for 15 minutes, then the second electric control valve 441 of the solvent evaporator 42 is opened, and the sample container 31 is opened. With the step of aerating the evaporative solvent inside,
S6, a step of mixing high-pressure steam and an evaporation solvent and aerating the sample container 31 for 45 minutes, at which time controlling the temperature of the sample container 31 to 85 ° C.
S7, a step of sequentially closing the second electric control valve 441 and the first electric control valve 431 and cooling for 20 minutes,
S8 includes a step of collecting the exudate discharged from the outer drainage pipe 251 and the lead drainage pipe 261 and allowing it to stand and centrifuge to obtain a supernatant to obtain an exudate that meets the standards.

Experimental Example This experimental example is based on the preparation method described in Example 2 above, and an object of the present invention is to explain the actual application effect of the invention. The leaching efficiency of the pesticide in the soil can be indicated by the amount of the residual insecticide in the soil, and the smaller the residual amount of the insecticide, the higher the extraction efficiency of the exudate. Since the residual amount of pesticide can be intuitively expressed in animal experiments, the test method is designed based on this idea.
The soil used in this experimental example is an artificially prepared experimental soil, and its composition is specifically shown in Table 1.
Shown in.
Table 1 Composition and proportion of experimental soil

The method for constructing the animal model used in this experimental example is as follows.
Eisenia fetida introduced from the Tianjin Great Ring Earthworm Factory was bred in an artificial environment (temperature 20 ± 2 ° C., humidity 80% ± 2, light irradiation 400 to 800 Lux, light-dark ratio 10:14) for 7 days. During the experiment, 300-500 mg of healthy 6-month-old earthworms with obvious reproductive rings were used.
In this experiment, imidacloprid contained in neonicotinoid insecticides was used as an experimental insecticide, and the information is shown in Table 2.
Table 2 Insecticide information

Comparison group:
In this experimental example, the soil pit leachate prepared by the conventional extraction method is used as a comparative group, and the specific preparation method is as follows.
The experimental soil pot and imidacloprid having a concentration of 2 mg / kg were mixed and dried as a soil pot sample at 60 ° C. for 0.5 h. The dried clay pot sample was crushed in a mortar, then sifted through a 20 mesh sieve, and the soil remaining on the sieve was crushed again and then sifted again. Water is added to the clay pot sample that has been thoroughly crushed and mixed uniformly, mixed, and leached and extracted for 15 minutes by ultrasonic waves.
Centrifugation was carried out at a rate of 4000 r / min for 10 min, and the supernatant was passed through a 0.22 μm filter.
500 g of a clay pot sample from which the exudate was extracted was placed in a 1 L beaker, 10 earthworms domesticated for 24 hours were placed in a drug-free artificial soil, and finally placed in an artificial climate box. 14 days later, the number of earthworm deaths and poisoning status were confirmed. ..

Experimental group:
In this experimental example, the soil exudate prepared by the preparation method of the present application is used as the experimental group, and the experimental soil of the experimental group is also mixed with imidacloprid having a concentration of 2 mg / kg. Divided into groups:
Experimental group 1: The pressure in the water evaporator 41 is controlled to 0.18 MPa, the pressure in the solvent evaporator 42 is controlled to 0.14 MPa, the ventilation time of the high-pressure steam is set to 10 min, and the ventilation time of the mixed steam is 30 min. To
Experimental group 2: The pressure in the water evaporator 41 is controlled to 0.22 MPa, the pressure in the solvent evaporator 42 is controlled to 0.16 MPa, the ventilation time of the high-pressure steam is set to 10 min, and the ventilation time of the mixed steam is 30 min. To
Experimental group 3: The pressure in the water evaporator 41 is controlled to 0.22 MPa, the pressure in the solvent evaporator 42 is controlled to 0.16 MPa, the ventilation time of the high-pressure steam is set to 15 min, and the ventilation time of the mixed steam is 45 min. And.
In each experimental group, 500 g of a clay pot sample from which the exudate was extracted was placed in a beaker, 10 earthworms bred in drug-free artificial soil for 24 hours were placed in the beaker, and finally placed in an artificial climate box. It was confirmed.
The extraction rate of the insecticide in the experimental soil from which the exudate was extracted was calculated, and the results are shown in Table 3.

Table 4 shows specific data on the effects of residual insecticides on earthworm growth and reproduction in the experimental soil from which the exudate was extracted.
Table 4 Effects of residual pesticides on earthworm growth and reproduction

As can be seen from the data in Tables 3 and 4, in the comparative group using the conventional soil leachate extraction method,
The pesticide extraction rate is about 46.6%, whereas in the experimental group using the soil pit leachate extraction method designed by the present invention, the pesticide extraction rate exceeds 85%, and the experimental results are In the best experimental group 3, the pesticide extraction rate reached 93.2%. This indicates that the extraction efficiency of the present invention is significantly improved as compared with the conventional method for extracting soil effluent.
Comparing the data of Experimental Group 1 and Experimental Group 2 in Table 4, when the ventilation time is the same, the larger the ventilation pressure, the smaller the effect on the weight and reproduction of earthworms, which is the insecticidal activity in the experimental soil. It can be seen that the residual amount of the agent decreases as the air pressure increases.
Comparing the data of Experimental Group 2 and Experimental Group 3 in Table 4, when the ventilation pressure is the same, the longer the ventilation time, the smaller the effect on the weight and reproduction of earthworms, which is the insecticidal activity in the experimental soil. It can be seen that the residual amount of the agent decreases as the ventilation time increases.

In short, as can be seen from the above experimental data, the soil exudate extraction method designed by the present invention has a higher pesticide extraction rate and a higher residual amount of pesticide in the treated soil as compared with the conventional method. Since there are few, it has high application value.

Claims (6)

A condensation tank (20) and an evaporation mechanism (4) provided above the condensation tank (20).
0) and a solid waste soil leachate preparation device for pesticide pesticide production areas, including
The evaporation mechanism (40) is a solvent evaporator (42) sequentially along the radial direction with the central axis as the center.
A water evaporator (41) is provided in the circumferential direction, a second heating plate (421) and a second heat transfer plate (422) are provided inside the solvent evaporator (42), and solvent vapor is provided outside. Conduit (44
) Is provided, a first heating plate (411) and a first heat transfer plate (412) are provided inside the water evaporator (41), and a steam conduit (43) communicates with the outside.
A steam press mechanism (30) is provided in the center of the top of the condensation tank (20), and a condensing plate (21) spirally extends to the inner wall of the condensation tank (20) corresponding to the position of the steam press mechanism (30). ) Is provided, and the condensing tank (20) corresponding to the position of the steam press mechanism (30) is provided.
) Is provided with a condensing tube (23) on the outer wall.
A sample container (31) provided with a steam exhaust hole (311) in the steam press mechanism (30).
Is provided, and the steam ring column (33) is inserted into the top of the sample container (31).
A liquid collection cover (37) having a hollowed-out hole (371) is connected to the center of the cone-shaped bottom of the sample container (31).
A steam microhole (333) is provided on the surface of the steam ring column (33), a secondary heating column (34) is provided on the central axis, and a seal ring cover (331) is provided on the top of the steam conduit (43). And the solvent vapor conduit (44) communicate with each other.
The leachate condensed from the bottom of the sample container (31) is collected by the liquid collection cover (37) and then along the guide strip (28) provided on the lower edge of the condensing plate (21) in the condensing tank (20). ) With a guide cover (27) provided in the center of the bottom of the solution outlet tube (26).
Inflow to
The leachate that has slid off the guide strip (28) is collected by the annular guide shell (24) provided outside the solution outlet tube (26), and then flows into the annular guide tube (25).
A device for preparing solid waste soil leachate in pesticide pesticide production areas. A support base (10) is provided below the condensation tank (20), and a support plate (14) is provided above.
Is provided, and a support ring (11) connected to a support base (10) via a support column (12) is provided on the outside, and a support hydraulic cylinder (13) is provided on the top of the support ring (11).
Is provided, and the top of the hydraulic rod in the support hydraulic cylinder (13) is the support plate (14).
The preparation apparatus according to claim 1, wherein the preparation apparatus is fixedly connected to the bottom of the). A movable seal cover (32) is provided on the top of the sample container (31), and an annular sample push plate (35) fitted in a steam ring column (33) inside the sample container (31).
2), And a solvent communication ring (36) is provided at a connection portion between the steam ring column (33), the steam conduit (43) and the solvent vapor conduit (44).
The preparation device described in. An outer seal ring (39) is provided on the outer wall of the sample container (31) which is flush with the movable seal cover (32), and an outer seal ring groove (391) is provided at the lower end of the outer seal ring (39). , Outer seal ring groove (391) on the top of the condensation tank (20)
The preparation apparatus according to claim 3, wherein a seal fit ring (202) constrained in the) is provided. The water evaporator (41) is provided with a first constant pressure valve (415), a first electric control valve (431) and a first air pressure sensor (414), and the solvent evaporator (42) is provided with a second. Constant pressure valve (4
25) The preparation apparatus according to claim 1, wherein a second electric control valve (441) and a second air pressure sensor (424) are provided. A method for preparing a soil exudate using the preparation device according to any one of claims 1 to 5.
S1, the step of drying the soil pot sample at a low temperature of 30 to 45 ° C., crushing it into powder, and filtering and removing the particles of gravel weeds.
S2, the treated soil sample is placed inside the sample container (31), the steam ring column (33) is pushed into the sample container (31), and then the top of the soil sample is pressed by the annular sample push plate (35). The step to press and
S3, pure water is injected into the water evaporator (41), a mixed solution is injected into the solvent evaporator (42), and the mixed solution contains alcohol having a mass concentration of 50 to 95% and a mass concentration of 10 to 20. A step composed of% acetone mixed in a mass ratio of 5: 1 and
S4, the first heating plate (411) and the second heating plate (421) are started to start heating,
A step of controlling the pressure in the water evaporator (41) to 0.18 to 0.22 MPa and a step of controlling the pressure in the solvent evaporator (42) to 0.14 to 0.16 MPa.
S5, First, the first electric control valve (431) of the water evaporator (41) is opened, and the sample container (31) is opened.
), And the second electric control valve (441) of the solvent evaporator (42) is opened to ventilate the evaporative solvent into the sample container (31).
S6, a step of mixing an evaporative solvent with high-pressure steam and aerating the sample container (31) for 30 to 45 minutes, and controlling the temperature of the sample container (31) to 75 to 85 ° C.
S7, sequentially close the second electric control valve (441) and the first electric control valve (431), 15 to 2
The step of cooling for 0 min and
S8, the step of collecting the exudate by the outer drainage pipe (251) and the outlet drainage pipe (261), allowing it to stand and centrifuging to obtain the supernatant liquid, and obtaining the exudate that meets the standard.
A method characterized by including.

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