Measurement method for cross-media transmission flux of soluble phenolic pollutants

Abstract

The present invention discloses a method for measuring the cross-medium transmission flux of soluble phenolic pollutants. The method comprises: determining the groundwater lower boundary flux based on the mass transfer and equilibrium principle by measuring the concentration of a tracer substance at three water extraction locations in a groundwater layer and the concentration in a lower boundary water chamber; obtaining the fluxes at the 1 / 2 position, the 3 / 4 position, and the soil-groundwater interface layer of the groundwater layer based on the measured flux at the groundwater lower boundary and the concentration of a tracer solute in the groundwater stratification; solving the concentration and flux of the soluble phenolic tracer substance in the soil layer based on an analytical solution of a motion equation of soluble substances in soil water under first-class boundary conditions; the solved flux in the soil-groundwater boundary layer is consistent with the measured flux, and the flux and variation are balanced within the entire upper boundary-soil-groundwater-lower boundary range, thereby determining the fluxes at the atmosphere-soil boundary, the soil-groundwater boundary, and the soil and groundwater layers.

Description

Technical Field

[0001] The present invention relates to the field of soil colloid migration measurement methods in the vadose zone, in particular to the field of soil colloid migration path measurement methods in the vadose zone based on electron transfer tracing, specifically to a method for measuring the cross-medium transmission flux of soluble phenolic pollutants. Background Art

[0002] Soluble phenolic pollutants, such as sodium methyl paraben, are simulated. Phenols, themselves phenols, are uniformly deposited on the surface through dry deposition. After dissolving in soil water, they interact with convection and diffusion. Phenols are common atmospheric pollutants and enter soil through both dry and wet deposition, where they migrate and ultimately enter groundwater, contaminating both soil and groundwater. Because they dissolve in water, soluble phenols exhibit significantly higher mobility than insoluble phenolic pollutants. Under cross-medium transport conditions, although phenolic pollutants are relatively stable and less susceptible to reacting with chemicals in the medium and undergoing mass changes during transport, they exhibit high adsorption properties. The adsorption-desorption interactions during transport through porous media significantly affect their transport flux, making it difficult to measure their flux based on mass balance principles and control boundary conditions. Furthermore, under continuous transport (cross-medium transport) through the atmosphere, soil, and groundwater multi-media, the boundary layer flux exhibits significant nonlinear variations, making cross-medium transport difficult to describe using numerical equations. Consequently, determining the flux based on an inversion model of the entire transport process is impossible. Summary of the Invention

[0003] To overcome the above-mentioned deficiencies of the prior art, the present invention provides a method for measuring the cross-medium transmission flux of soluble phenolic pollutants, comprising:

[0004] S1: The soil to be tested is filled into the test device to form a test soil column. The soil filling method in different areas of the soil column is consistent with the original soil and the moisture content is kept consistent. Multiple water collectors are buried in the test device cavity to collect soil solution by vacuum for measurement. The lower boundary water chamber is located below the test soil column.

[0005] S2, spraying tracer material on the surface of the test soil column to simulate dry deposition in the atmosphere, sealing the upper boundary with water-proof material for several hours, and then spraying at different times t1, t2, ... t n , continuously draw water at three depths of the groundwater layer and the lower boundary water chamber, and automatically replenish the water with the same amount of water as the measured water intake after the water is taken, keep the groundwater level unchanged, measure the tracer substance concentration at the three water intake positions of the groundwater layer and the concentration in the lower boundary water chamber, and measure the groundwater lower boundary measurement flux;

[0006] S3, based on the flux measured at the lower boundary of groundwater and the concentration of tracer solutes in groundwater stratification, the fluxes at the 1 / 2 position, 3 / 4 position and the soil-groundwater interface layer were obtained;

[0007] S4, based on the analytical solution of the motion equation of soluble substances in soil water under the first type of boundary conditions, the concentration and flux of soluble phenol tracer substances at each position in the soil layer are solved;

[0008] S5, based on the concentration and flux of soluble phenol tracer substances in each layer, the cross-media flux processes at the atmosphere-soil boundary, soil-groundwater boundary, and within the soil layer and groundwater layer were obtained.

[0009] As a further technical solution, the tracer substance in step S2 is particulate sodium methyl parahydroxybenzoate. 10 ml of the water sample extracted in step S2 is extracted, 1 ml of 10.6% sodium carbonate solution is added, and the mixture is heated for 30 seconds, cooled, and then 0.1% 4-aminoantipyrine borate buffer solution with a pH value of 9 and 5.3% potassium ferricyanide solution are added until a red color appears. The concentration of sodium methyl parahydroxybenzoate is determined based on the added potassium ferricyanide solution.

[0010] As a further technical solution, in step S3, based on the groundwater lower boundary flux measurement and the groundwater stratification tracer solute concentration, the fluxes at the groundwater layer 1 / 2 position, 3 / 4 position and the soil-underground interface layer are obtained, including:

[0011] 1) Based on the mass balance method, the groundwater layer is divided into four layers: the interval from the soil water-groundwater interface to the 1 / 4 depth position, the interval from the 1 / 4 to the 1 / 2 depth position, the interval from the 1 / 2 to the 3 / 4 depth position, and the interval from the 3 / 4 depth position to the lower boundary of the groundwater layer. The concentration and water volume changes in the lower boundary water chamber are measured to determine the flux of the lower groundwater boundary.

[0012] 2) Based on the concentration measured by sampling between the 3 / 4 depth position and the lower boundary of the groundwater, calculate the mass difference of soluble phenols in the layer. According to the principle of mass balance, at the upper boundary of the layer, that is, the 3 / 4 depth position, the soluble flux entering is equal to the sum of the mass change of soluble phenols in the layer and the flux at the lower boundary. Determine the flux at the 3 / 4 depth position. Similarly, determine the flux at the 1 / 2 position, 1 / 4 position of the groundwater layer and the boundary layer between soil and groundwater.

[0013] As a further technical solution, in step S4, for the soil layer, the motion equation of soluble matter in soil water is expressed as:

[0014] (1);

[0015] Where R is the adsorption coefficient of soil for phenolic pollutants, θ is the soil moisture content, c is the concentration of soluble phenol in the soil solution, D is the diffusion coefficient of phenol in the soil, z is the vertical coordinate, and q is the convective flux formed by the movement of soil water;

[0016] The upper boundary (atmosphere-soil boundary) is the first type of boundary condition:

[0017] (2);

[0018] That is, at the z=0 position, the concentration at any time t is c0;

[0019] For equation (1) and boundary conditions (2), the analytical solution is:

[0020] (3);

[0021] in, is the complementary error function, .

[0022] As a further technical solution, under test conditions, q is a constant value that depends on the soil moisture content. According to equation (3), the concentration at the depth z of the soil layer at time t can be determined. For the horizontal interface at the depth z in the soil, the pollution flux can be expressed as:

[0023] ;

[0024] Where D is the diffusion coefficient of phenol in soil, c is the concentration of soluble phenol in soil solution, z is the vertical coordinate, Q s (z) is the pollution load flux at position z.

[0025] According to another aspect of the present invention, a device for measuring the cross-medium transmission flux of soluble phenolic pollutants is provided, comprising:

[0026] The measuring shell is used to fill the soil to be tested to form a test soil column;

[0027] A groundwater chamber is set below the measuring soil column and is used to obtain the mass of pollutants that enter the water chamber through the lower boundary of the groundwater layer;

[0028] Ceramic samplers are buried at different depths of the groundwater layer to extract groundwater solutions at different depths of the groundwater layer;

[0029] The Malliot bottle is connected to the groundwater layer and the groundwater chamber of the test soil column respectively. It is used to automatically replenish water after the groundwater layer solution and the groundwater chamber solution are extracted to keep the groundwater level unchanged.

[0030] As a further technical solution, the soil to be tested is divided into soil layer and groundwater layer, and the groundwater layer is divided into four layers: soil water ~ groundwater interface ~ 1 / 4 depth position interval, 1 / 4 ~ 1 / 2 depth position interval, 1 / 2 ~ 3 / 4 depth position interval and 3 / 4 depth position ~ lower boundary of the groundwater layer.

[0031] As a further technical solution, the ceramic sampler collects water samples through a vacuum pump and a water receiver.

[0032] As a further technical solution, the ceramic samplers are divided into four groups and buried at the soil-groundwater boundary - 1 / 4 depth of groundwater, 1 / 4~1 / 2 depth of groundwater, 1 / 2~3 / 4 depth of groundwater and the middle of 3 / 4 depth of groundwater and the lower boundary of groundwater, respectively, for extracting water sample solutions of corresponding depths.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: based on the analytical solution of the motion equation of soluble substances in soil water under the first type of boundary conditions, the present invention solves the concentration and flux of soluble phenol tracer substances in each layer, and the flux is consistent with the flux measured in the soil-groundwater boundary layer, and the flux and change in the entire upper boundary-soil-groundwater-lower boundary range are balanced, thereby obtaining the flux at the atmosphere-soil boundary, the soil-groundwater boundary, and the soil layer and the groundwater layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 Schematic diagram of the device structure of the method for measuring the cross-medium transmission flux of soluble phenol pollutants provided in an embodiment of the present invention.

[0036] Figure 2 The concentrations of the tracer substance (sodium methyl parahydroxybenzoate) at three monitoring locations in groundwater were measured according to an embodiment of the method for measuring the cross-media transmission flux of soluble phenolic pollutants provided in an embodiment of the present invention.

[0037] Figure 3 The embodiment of the method for measuring the cross-media transmission flux of soluble phenolic pollutants provided in the present invention is based on the soil-groundwater boundary flux determined by the mass balance process and the comparison with the analytical solution.

[0038] In the figure: 1. Soil layer; 2. Groundwater layer; 3. Ceramic sampler; 4. Vacuum pump; 5. Water receiver; 6. Malliot bottle. DETAILED DESCRIPTION

[0039] The terms "including" and "having" and any variations thereof in the description and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to the steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention are arbitrarily combined with each other to form a new technical solution. This combination is not restricted by the sequence of steps and / or structural composition mode, but must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that this combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] See also Figure 1-3 The embodiment of the present invention provides a method for measuring the cross-medium transmission flux of soluble phenolic pollutants, comprising the following steps:

[0042] S1: The soil to be tested is filled into the test device to form a test soil column. The soil filling method in different areas of the soil column is consistent with the original soil, and the moisture content is kept consistent. Multiple water collectors are buried in the test device cavity to collect soil solution through vacuum for measurement. There is a lower boundary water chamber below the test soil column;

[0043] Before the test, the concentration of total soluble phenols in the atmosphere at the site was measured and the depth of the soil-shallow groundwater profile was determined. According to the thickness of the soil-shallow groundwater profile at the test site, soil columns were made in proportion. Figure 1 The height of the soil-groundwater layer 2 in the soil column is not less than 1.0 m. The lower boundary of the soil column is the water chamber, which is filled with soil from the in-situ depth according to the measured soil parameters (bulk density).

[0044] S2, spraying tracer material on the surface of the test soil column to simulate dry deposition in the atmosphere. After several hours of sealing the upper boundary with water-proof material, at different times t1, t2, ... t n , water is continuously sampled at three depths of the groundwater layer 2 and the lower boundary water chamber through multiple ceramic samplers 3, the tracer substance concentrations at the three water sampling locations of the groundwater layer 2 and the concentration in the lower boundary water chamber are measured, and the groundwater lower boundary flux is measured.

[0045] The test was carried out 12 hours after the upper boundary was sealed with the waterproof material, and the adjacent time periods in t1, t2, ...t were time intervals of 2 hours.

[0046] The moisture content of the entire soil layer 1 remains consistent, and the groundwater level is controlled to remain unchanged by the Marriott bottle 6. Ceramic negative pressure samplers are buried between the soil-groundwater boundary and the 1 / 4 depth of the groundwater, the 1 / 4 to 1 / 2 depth of the groundwater, the 1 / 2 to 3 / 4 depth of the groundwater, and the 3 / 4 depth to the lower boundary of the groundwater. Under positive pressure, groundwater cannot enter the ceramic sampler 3, thereby controlling the sampling time and preventing groundwater from entering the sampler at non-measurement time and affecting the measurement results.

[0047] At the upper boundary of the soil, particulate sodium methyl paraben was used as a tracer to simulate atmospheric phenol dry deposition. To improve measurement accuracy, the mass of the tracer per soil column area was calculated as the field-measured concentration of total soluble phenols in the atmosphere multiplied by the atmospheric deposition height (2.0 m) multiplied by the magnification factor and the mass conversion factor, where the magnification factor was no less than 10.0. The mass conversion factor was calculated as the molar mass of the tracer divided by the molar mass of total phenols. The particulate tracer ranged from 10 to 100 microns and was evenly distributed across the surface of the soil column.

[0048] After taking water from different depths in the groundwater layer 3 and the groundwater chamber, the Marriott bottle 6 contains deionized water. After taking water from the groundwater layer and the water chamber, water is automatically replenished to keep the groundwater level unchanged. The amount of water replenished in the Marriott bottle 6 is the same as the measured amount of water taken.

[0049] The mass of pollutants entering the water chamber through the lower boundary of the groundwater layer can be determined based on the changes in concentration and water volume in the groundwater chamber between the two measurements. The pollutant flux is the pollutant mass / the time interval between the two measurements.

[0050] The principle for calculating the concentration of tracer substances in water samples is to select 10 ml of sample, add 1 ml of 10.6% sodium carbonate solution, heat for 30 seconds and then cool, then add 0.1% 4-aminoantipyrine in borate buffer (pH 9.0) and 5.3% potassium ferricyanide solution until red color appears, and determine the concentration of sodium methyl parahydroxybenzoate based on the added potassium ferricyanide solution.

[0051] The test was terminated without significant changes in the flux of soluble phenols into the lower boundary groundwater chamber.

[0052] S3, based on the flux measured at the lower groundwater boundary and the concentration of tracer solutes in the groundwater stratification, determines the concentration of the soil-groundwater interface layer, including:

[0053] Based on the mass balance method, the groundwater layer 2 is divided into four layers: the interval from the soil water-groundwater interface to the 1 / 4 depth position, the interval from the 1 / 4 to the 1 / 2 depth position, the interval from the 1 / 2 to the 3 / 4 depth position, and the interval from the 3 / 4 depth position to the lower boundary of the groundwater layer. The concentration and water volume changes in the water chamber at the lower boundary can be measured to determine the flux of the lower groundwater boundary.

[0054] Based on the concentration measured by sampling between the 3 / 4 depth position and the lower boundary of the groundwater layer, the mass difference of soluble phenol in the layer is calculated. According to the mass balance principle, the soluble flux entering at the upper boundary of the layer (i.e., the 3 / 4 depth position) is equal to the sum of the mass change of soluble phenol in the layer and the flux at the lower boundary. The flux at the 3 / 4 depth position is determined, and so on, the flux at the 1 / 2 position, 1 / 4 position and the soil-groundwater interface layer of the groundwater layer is determined. Figure 2 Soluble phenol tracer concentrations measured at four locations.

[0055] S4, based on the analytical solution of the motion equation of soluble substances in soil water under the first type of boundary conditions, the concentration and flux of soluble phenol tracer substances in each layer are solved.

[0056] Specifically, for soil layer 1, the motion equation of soluble matter in soil water is expressed as:

[0057] (1);

[0058] Where R is the adsorption coefficient of soil for phenolic pollutants, θ is the soil moisture content, c is the concentration of soluble phenol in the soil solution, D is the diffusion coefficient of phenol in the soil, z is the vertical coordinate, q is the convective flux formed by soil water movement, and t is the test time.

[0059] The upper boundary (atmosphere-soil boundary) is the first type of boundary condition:

[0060] (2);

[0061] That is, at the z=0 position, the concentration at any time t is c0;

[0062] Formula (1) can be expressed as:

[0063] (3);

[0064] According to the principle of water flow continuity:

[0065] (4);

[0066] so:

[0067] ;

[0068] Therefore (3) becomes:

[0069] (5);

[0070] The image function of c after the transformation is obtained by Laplace transform. The is:

[0071] (6);

[0072] right Using Laplace transform, that is:

[0073] (7);

[0074] Using the method of integration by parts, let

[0075] , , , (8);

[0076] ;

[0077] Transform the right side of Equation (5) to obtain:

[0078] (9);

[0079] After transformation, Equation (5) can be written in ordinary differential form because it only contains the derivative of the image function with respect to z:

[0080]

[0081] (10);

[0082] The general solution of formula (10) is:

[0083] (11);

[0084] After the transformation of formula (10), the boundary condition becomes:

[0085] ;

[0086] According to the measurement conditions of the soil column, C1 is 0, then formula (11):

[0087] ;

[0088] ;

[0089] Substituting into (11), we get the image function The solution is:

[0090] ;

[0091] From the Laplace transform inverse transformation table:

[0092] = ;

[0093] The analytical solution is:

[0094] (12);

[0095] in, is the complementary error function, ;

[0096] Under test conditions, q is a constant value that depends on the soil moisture content. According to Equation (12), the concentration at the depth z of the soil layer at time t can be determined. For the horizontal interface at the depth z in the soil, the pollution flux can be expressed as:

[0097] ;

[0098] Where D is the diffusion coefficient of phenol in soil, c is the concentration of soluble phenol in soil solution, z is the vertical coordinate, Q s (z) is the pollution load flux at position z.

[0099] S5, based on the concentration and flux of soluble phenol tracer substances in each layer, the flux processes at the atmosphere-soil boundary, soil-groundwater boundary, and within soil layer 1 and groundwater layer 2 are obtained.

[0100] Specifically, the concentration and flux of soluble phenol tracer substances in each layer are solved, and the flux is consistent with the flux measured in the soil-groundwater boundary layer, and the flux and variation are balanced in the entire upper boundary-soil-groundwater-lower boundary range.

[0101] Based on the same inventive concept as the aforementioned method embodiment, an embodiment of the present invention further provides a device for testing the flux and kinetic parameters of stable gaseous pollutants under cross-medium transmission conditions, comprising:

[0102] The measuring shell is used to fill the soil to be tested to form a test soil column.

[0103] The soil to be tested is divided into soil layer 1 and groundwater layer 2. The groundwater layer 2 is divided into four layers: soil water to groundwater interface to 1 / 4 depth position, 1 / 4 to 1 / 2 depth position, 1 / 2 to 3 / 4 depth position, and 3 / 4 depth position to the lower boundary of the groundwater layer.

[0104] The groundwater chamber is set below the measuring soil column and is used to obtain the mass of pollutants that enter the water chamber through the lower boundary of the groundwater layer.

[0105] The ceramic sampler 3 is buried at different depths in the groundwater layer 2 and is used to extract groundwater solutions at different depths in the groundwater layer 2 .

[0106] Among them, the ceramic sampler 3 is also connected to a vacuum pump 4 located outside the test soil column and a water receiver 5. Under positive pressure, groundwater cannot enter the ceramic sampler 3, so as to control the sampling time and avoid groundwater entering the sampler at non-measurement time to affect the measurement results. When the sample needs to be collected, the vacuum pump 4 will pump the ceramic sampler 3 into a negative pressure environment, and the corresponding solution can enter the water receiver 5 through the ceramic sampler 3 for collection.

[0107] There are four groups of ceramic samplers 3, which are buried at the soil-groundwater boundary - 1 / 4 depth of groundwater, 1 / 4~1 / 2 depth of groundwater, 1 / 2~3 / 4 depth of groundwater and the middle of 3 / 4 depth of groundwater and the lower boundary of groundwater, respectively, for extracting water sample solutions of corresponding depths.

[0108] The Malliot bottle 6 is connected to the groundwater layer 2 of the test soil column and the groundwater chamber respectively, and is used to automatically replenish water after the groundwater layer solution and the groundwater chamber solution are extracted to keep the groundwater level unchanged.

[0109] In summary, the present invention is based on the analytical solution of the motion equation of soluble substances in soil water under the first type of boundary conditions, solves the concentration and flux of soluble phenol tracer substances in each layer, and is consistent with the flux measured in the soil-groundwater boundary layer, and the flux and change in the entire upper boundary-soil-groundwater-lower boundary range are balanced, thereby obtaining the flux at the atmosphere-soil boundary, the soil-groundwater boundary, and the soil layer and groundwater layer.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring the cross-medium transmission flux of soluble phenolic pollutants, characterized in that: include: S1: The soil to be tested is filled into the test device to form a test soil column. The soil filling method in different areas of the soil column is consistent with the original soil, and the moisture content is kept consistent. Multiple water collectors are buried in the test device cavity to collect soil solution through vacuum for measurement. The lower boundary water chamber is located below the test soil column; S2, spraying tracer material on the surface of the test soil column to simulate dry deposition in the atmosphere, sealing the upper boundary with water-proof material for several hours, and then at different times t1, t2, ... t n , continuously draw water at three depths of the groundwater layer and the lower boundary water chamber, and automatically replenish the water with the same amount of measured water after drawing water, keep the groundwater level unchanged, and measure the tracer concentration at the three water drawing positions of the groundwater layer and the concentration in the lower boundary water chamber to determine the groundwater lower boundary measurement flux; S3, based on the flux measured at the lower boundary of groundwater and the concentration of tracer solutes in groundwater stratification, the fluxes at the 1 / 2 position, 3 / 4 position and soil-groundwater interface layer were obtained based on the flux and equilibrium principle; S4. Based on the analytical solution of the motion equation of soluble substances in soil water under the first type of boundary conditions, the concentration and flux of soluble phenol tracer substances at each position in the soil layer are solved; for the soil layer, the motion equation of soluble substances in soil water is expressed as: （1）； Where R is the adsorption coefficient of soil for phenolic pollutants, θ is the soil moisture content, c is the concentration of soluble phenol in the soil solution, D is the diffusion coefficient of phenol in the soil, z is the vertical coordinate, q is the boundary layer water flux, and t is the test time; The upper boundary, that is, the atmosphere-soil boundary, is under the first type of boundary conditions: （2）； That is, at the z=0 position, the concentration at any time t is c0; For equation (1) and boundary conditions (2), the analytical solution is: （3）； in, is the complementary error function, ; S5, based on the concentration and flux of soluble phenol tracers in each layer, the flux processes at the atmosphere-soil boundary, soil-groundwater boundary, and within the soil layer and groundwater layer were obtained.

2. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 1, characterized in that: The tracer substance in step S2 is particulate sodium methyl parahydroxybenzoate. In the extraction step S2, 10 ml of the water sample is extracted, 1 ml of a 10.6% sodium carbonate solution is added, the sample is heated for 30 seconds, cooled, and then a 0.1% 4-aminoantipyrine borate buffer solution with a pH of 9 and a 5.3% potassium ferricyanide solution are added until a red color appears. The concentration of sodium methyl parahydroxybenzoate is determined based on the added potassium ferricyanide solution.

3. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 1, characterized in that: In step S3, based on the groundwater lower boundary flux and the groundwater stratification tracer solute concentration, the fluxes at the groundwater layer 1 / 2 position, 3 / 4 position and the soil-underground interface layer are obtained, including: 1) Based on the mass balance method, the groundwater layer is divided into four layers: the interval from the soil water-groundwater interface to the 1 / 4 depth position, the interval from the 1 / 4 to the 1 / 2 depth position, the interval from the 1 / 2 to the 3 / 4 depth position, and the interval from the 3 / 4 depth position to the lower boundary of the groundwater layer. The concentration and water volume changes in the lower boundary water chamber are measured to determine the flux of the lower groundwater boundary. 2) Based on the concentration measured by sampling between the 3 / 4 depth position and the lower boundary of the groundwater layer, calculate the mass difference of soluble phenols in the layer. According to the mass balance principle, at the upper boundary of the layer, that is, at the 3 / 4 depth position, the soluble flux entering is equal to the sum of the mass change of soluble phenols in the layer and the flux at the lower boundary. Determine the flux at the 3 / 4 depth position. Similarly, determine the flux at the 1 / 2 position, 1 / 4 position of the groundwater layer and the soil-groundwater interface layer.

4. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 1, characterized in that: Under the test conditions, q is a constant value that depends on the soil moisture content. The concentration at the depth z of the soil layer at time t is determined according to equation (3). For the horizontal interface at the depth z in the soil, its pollution load flux is expressed as: ； Where D is the diffusion coefficient of phenol in soil, c is the concentration of soluble phenol in soil solution, z is the vertical coordinate, Q s (z) is the pollution load flux at position z.

5. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to any one of claims 1 to 4, characterized in that: The method is implemented using a device for measuring the cross-medium transmission flux of soluble phenolic pollutants, the device comprising: The measuring shell is used to fill the soil to be tested to form a test soil column; A groundwater chamber is set below the measuring soil column and is used to obtain the mass of pollutants that enter the water chamber through the lower boundary of the groundwater layer; Ceramic samplers are buried at different depths of the groundwater layer to extract groundwater solutions at different depths of the groundwater layer; The Malliot bottle is connected to the groundwater layer and the groundwater chamber of the test soil column respectively. It is used to automatically replenish water after the groundwater layer solution and the groundwater chamber solution are extracted to keep the groundwater level unchanged.

6. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 5, characterized in that: The soil to be tested is divided into soil layer and groundwater layer. The groundwater layer is divided into four layers: the interval between the soil-water and groundwater interface and the 1 / 4 depth position, the 1 / 4 to 1 / 2 depth position, the 1 / 2 to 3 / 4 depth position, and the 3 / 4 depth position to the lower boundary of the groundwater layer.

7. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 6, characterized in that: The ceramic sampler collects water samples through a vacuum pump and a water collector.

8. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 7, characterized in that: There are four groups of ceramic samplers, which are buried respectively at the junction of soil and groundwater - 1 / 4 depth of groundwater, 1 / 4~1 / 2 depth of groundwater, 1 / 2~3 / 4 depth of groundwater and the middle part between 3 / 4 depth of groundwater and the lower boundary of groundwater, for extracting water sample solutions of corresponding depths.

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