Method for measuring cross-medium transmission flux of soluble phenolic pollutants

Abstract

The invention discloses a soluble phenolic pollutant cross-medium transmission flux measurement method, which comprises the following steps: measuring tracer substance concentrations of three water taking positions of an underground water layer and the concentration in a lower boundary water chamber, and based on a mass transmission and balance principle, measuring underground water lower boundary flux; based on the underground water lower boundary measurement flux and the underground water layered tracer solute concentration, obtaining the flux of the 1 / 2 position, the 3 / 4 position and the soil-underground water boundary layer of the underground water layer; based on an analytical solution of a soluble substance in a motion equation of soil water under a first type of boundary conditions, the concentration and flux of a soil layer soluble phenol tracer substance are solved, the solution flux of a soil-groundwater boundary layer is consistent with the measurement flux, and the flux and the variable quantity in the whole upper boundary-soil-groundwater-lower boundary range are balanced. Fluxes within the atmosphere-soil boundary, the soil-groundwater boundary, and the soil and groundwater layers are determined.

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] The soluble phenol pollutant simulated by sodium methyl paraben is phenol itself. It is uniformly deposited on the surface in the form of dry deposition. After dissolving with water in the soil, it reacts with water convection and diffusion. Phenol is a common pollutant in the atmosphere. Phenol enters the soil in the form of dry and wet deposition, moves in the soil and finally enters the groundwater, polluting the soil and groundwater. Because soluble phenol is dissolved in water, its flow properties are significantly higher than those of insoluble phenol pollutants. Under cross-medium transmission conditions, although phenol pollutants are more stable and not easy to react with chemicals in the medium and change mass during transmission, phenol pollutants have higher adsorption properties. The adsorption-desorption effect during the transmission process of porous media will have a significant impact on its transmission flux. It is difficult to measure its flux based on the mass balance principle by controlling the boundary conditions. More importantly, under the continuous transmission (cross-medium transmission) conditions of atmosphere-soil-groundwater multi-media, the boundary layer flux will undergo significant nonlinear changes. It is difficult for numerical equations to describe cross-medium transmission, so it is impossible to determine the flux based on the model inversion of the entire transmission process. Summary of the invention

[0003] In order 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 cavity of the test device to collect soil solution through vacuum for measurement. The lower boundary water chamber is below the test soil column;

[0005] S2, spray the tracer material on the soil surface of the test soil column to simulate the dry deposition in the atmosphere. After several hours of sealing the upper boundary with waterproof material, 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, measure the tracer substance concentration at the three water drawing locations 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 of the groundwater layer 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 after heating for 30 seconds and cooling, 0.1% 4-aminoantipyrine borate buffer with a pH value of 9 and 5.3% potassium ferrocyanide solution are added until red appears, and the concentration of sodium methyl parahydroxybenzoate is determined based on the added potassium ferrocyanide solution.

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

[0011] 1) Based on the mass balance method, 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. The concentration and water volume changes in the lower boundary water chamber are measured to determine the flux of the lower boundary of the groundwater;

[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 phenol in the layer. According to the principle of mass balance, at the upper boundary of the layer, i.e. the 3 / 4 depth position, the soluble flux entering is equal to the sum of the mass change of soluble phenol in the layer and the flux at the lower boundary. Determine the flux at the 3 / 4 depth position, and so on, 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 the soluble substance in the soil water is expressed as:

[0014] (1);

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

[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 the 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, its 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, which 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, 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.

[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 to 1 / 2 depth of groundwater, 1 / 2 to 3 / 4 depth of groundwater and the middle part between 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 amount in the entire upper boundary-soil-groundwater-lower boundary range are balanced, thereby obtaining the flux in the atmosphere-soil boundary, soil-groundwater boundary, and soil layer and 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 is 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 A schematic diagram of the device structure of a method for measuring the cross-medium transmission flux of soluble phenolic pollutants provided in an embodiment of the present invention.

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

[0037] Figure 3 The embodiment of the method for measuring the cross-media transport flux of soluble phenolic pollutants provided by 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 specification 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 comprising 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without 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 the structural composition mode, but must be based on the ability of ordinary technicians in this field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered 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 cavity of the test device to collect soil solution through vacuum for measurement. There is a lower boundary water chamber under the test soil column;

[0043] Before the test, the concentration of soluble total 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 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, and the lower boundary of the soil column is the water chamber, which is filled with soil from the original depth according to the measured soil parameters (bulk density).

[0044] S2, spray the tracer material on the surface of the test soil column to simulate the dry deposition in the atmosphere. After the upper boundary is sealed with water-proof materials, at different times t1, t2, ...t n , water is continuously taken 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 taking locations in 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 by the waterproof material, and the adjacent time periods in t1, t2, ...t were timed with a step length 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 in the middle of the soil-groundwater boundary ~ 1 / 4 depth of the groundwater, 1 / 4~1 / 2 depth of the groundwater, 1 / 2~3 / 4 depth of the groundwater, and 3 / 4 depth ~ the lower boundary of the groundwater. Under positive pressure, groundwater cannot enter the ceramic sampler 3, so as to control the sampling time and prevent groundwater from entering the sampler at non-measurement time to affect the measurement results.

[0047] The upper boundary of the soil uses granular sodium methyl paraben as a tracer to simulate the dry deposition of atmospheric phenols. In order to improve the measurement accuracy, the mass of the tracer in the soil column area is the concentration of soluble total phenols in the atmosphere measured on site × atmospheric deposition height (2.0m) × magnification factor × mass conversion factor, where the magnification factor is not less than 10.0, and the mass unit conversion factor is the molar mass of the tracer / the molar mass of total phenols. The size of the granular tracer is between 10 and 100 microns, and it is evenly distributed on 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 of the groundwater chamber between two measurements. The pollutant flux is the mass of pollutants / the time interval between the two measurements.

[0050] The principle of 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 ferrocyanide solution until red color appears, and determine the concentration of sodium methyl parahydroxybenzoate based on the added potassium ferrocyanide 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 3 / 4 depth position to the lower boundary of the groundwater layer. The concentration and water volume changes in the lower boundary water chamber can be measured to determine the flux of the lower boundary of the groundwater.

[0054] According to 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 of the groundwater layer and the soil-groundwater interface 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] Among them, R is the adsorption coefficient of soil for phenol pollutants, θ is the soil moisture content, c is the concentration of soluble phenol in soil solution, D is the diffusion coefficient of phenol in soil, z is the vertical coordinate, q is the convection 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 Laplace transform is used to solve the problem. The image function of c after the transformation is 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 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 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 the 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, its 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 based on 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 are balanced in the entire upper boundary-soil-groundwater-lower boundary range.

[0101] Based on the same inventive concept as the aforementioned method embodiment, the 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 ~ 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.

[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 of the groundwater layer 2 and is used to extract groundwater solutions at different depths of 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 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 sets 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 determines the flux in accordance with the soil-groundwater boundary layer, and the flux and change in the entire upper boundary-soil-groundwater-lower boundary are balanced, thereby obtaining the flux at the atmosphere-soil boundary, the soil-groundwater boundary, and the soil layer and the 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 cavity of the test device to collect soil solution through vacuum for measurement. The lower boundary water chamber is below the test soil column; S2, spray the tracer material on the soil surface of the test soil column to simulate the dry deposition in the atmosphere. After several hours of sealing the upper boundary with waterproof material, at different times t1, t2, ...t n , continuously draw water at three groundwater layer depths 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 concentration of tracer substances at three water drawing locations in 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 flux at the 1 / 2 position, 3 / 4 position and soil-groundwater interface layer of the groundwater layer was 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; 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 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 step S2, 10 ml of the water sample is extracted, 1 ml of 10.6% sodium carbonate solution is added, and after heating for 30 seconds and cooling, 0.1% 4-aminoantipyrine borate buffer with a pH value of 9 and 5.3% potassium ferrocyanide solution are added until red color appears. The concentration of sodium methyl parahydroxybenzoate is determined based on the added potassium ferrocyanide 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 measurement and the groundwater stratification tracer solute concentration, the fluxes of 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: 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. The concentration and water volume changes in the lower boundary water chamber are measured to determine the flux of the lower boundary of the groundwater; 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 phenol in the layer. According to the principle of mass balance, at the upper boundary of the layer, i.e. the 3 / 4 depth position, the soluble flux entering is equal to the sum of the mass change of soluble phenol in the layer and the flux at the lower boundary. Determine the flux at the 3 / 4 depth position, and so on, 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: In step S4, for the soil layer, the motion equation of soluble matter 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 soil solution, D is the diffusion coefficient of phenol in 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, .

5. The method for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 4, 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 can be 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.

6. A device for measuring the cross-medium transmission flux of soluble phenolic pollutants, used to implement the cross-medium transmission flux measurement method of soluble phenolic pollutants as claimed in any one of claims 1 to 5, characterized in that: include: The measuring shell is used to fill the soil to be tested to form a test soil column; A groundwater chamber, which 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, 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.

7. The device for measuring the cross-medium transmission flux of soluble phenolic pollutants according to claim 6, characterized in that: The soil to be tested is divided into soil layer and groundwater layer. 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.

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

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

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