CN107238667A - A kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil - Google Patents
A kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil Download PDFInfo
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Abstract
The invention discloses a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil, by the assessment indicator system for building science, determine that hexachlorobenzene content is in aqueous phase in soil, Ecological risk index in gas phase and solid phase, the method detected using gas-chromatography electron capture detector is detected to the hexachlorobenzene content in soil, experiment with computing is carried out to the toxic effect of animal to the hexachlorobenzene content in soil, the risk standard recommended finally according to U.S. EPA, to characterize the influence of influence and its environmental pollution of the three-phase discharge to hexachlorobenzene content in soil.The method design science of the present invention, is adapted to the soil hexachloro-benzene pollutant research caused for industrial production, by combination of qualitative and quantitative analysis, the influence degree of exact evaluation pollution sources.
Description
Technical field
It is specifically to be related to a kind of three-phase that is based on to discharge to soil the invention belongs to POPs class material assessment technique fields
The influence evaluation method of middle hexachlorobenzene content.
Background technology
Persistence organic pollutant（Persistent Organic Pollutants, abbreviation POPs）Refer to mankind's synthesis
It can persistently be present in environment, be accumulated by Food chain and human health is caused the chemical substance of adverse effect.It has
Standby four kinds of characteristics：High poison, lasting, bioaccumulation, long-distance mobility, and positioned at the mankind on biological chain top, then these
Toxicity has been amplified to 70,000 times.
The international first batch of persistence organic pollutant of POPs pacts is divided into organochlorine insecticide, industrial chemical and unintentional life
The class of accessory substance three of production, including drinox, Niran, DDT, dieldrite, endrin, heptachlor, mirex, toxaphene,
Polychlorinated biphenyls, hexachloro-benzene, bioxin and furans.
Hexachloro-benzene（Hexachlorobenzene, HCB）Environmental pollution and accumulation be due to be not easily decomposed in the environment,
Human body is enriched to by food chain, harm is produced to health.Main harm is shown as：（1）Toxicity：Hexachloro-benzene（HCB）Have
Low or relatively low Acute Toxicity, while have the effect of chronic or subchronic toxicity, animal is subacute and chronic toxicity
There is coproporphyrin excretion increase etc. in neurotoxic symptoms, liver, kidney weight increase, urine.（2）Genotoxicity：HCB is endocrine disruption
Thing, gives HCB and PCP（HCB metabolin）Significantly affect thyroxine in mouse cerebrospinal fluid（T4）Supply.Draw exposed to HCB
The change of the epidermis of the ovary of the primate risen.But also there are some researches show the mouse ovary to HCB still has instead to promoting sex hormone
Should, it is indirect to show influences of the HCB to ovary, and HCB genotoxicities are the increased results of class ester thing peroxidating, especially primary
Folliculus ovarii anomalous effects cell membrane, and then influence its permeability.（3）Carcinogenicity：IARC carcinogenicities are commented on：Carcinogenicity is classified：
Artificial dubiety reaction, animal is positive reaction.
Therefore, detection and improvement for hexachloro-benzene in natural environment is significant, is flowed into especially by number of ways
The hexachloro-benzene pollutant of soil, controls and comprehends the source for causing whole biological chain and pollute, so as to be good for human body and animal not in time
Health produces harm, while hexachloro-benzene pollutant in detecting soil, in addition it is also necessary to remove further investigation multiple factors to soil
The influence degree of middle hexachloro-benzene pollutant, this is only the key for administering problem of environmental pollution caused by hexachloro-benzene pollutant.
The content of the invention
Present invention solves the technical problem that there is provided a kind of influence discharged based on three-phase to hexachlorobenzene content in soil
Evaluation method, is built, three-phase discharges determination to hexachloro-benzene pollution effect risk index in soil, so by assessment indicator system
The method detected afterwards using gas chromatography-electron capture detector is detected to the hexachlorobenzene content in soil, in soil
Hexachlorobenzene content experiment with computing is carried out to the toxic effect of animal, risk assessment standard is most determined later.
The technical scheme is that：A kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil,
Mainly include the following steps that：
（1）Assessment indicator system is built：3 indexs of toxic factor, pollution index, detected level for choosing hexachloro-benzene in soil are built
Hexachloro-benzene pollutes combined influence evaluation model in soil；
（2）Three-phase discharges the determination to hexachloro-benzene pollution effect risk index in soil：According to described assessment indicator system, structure
Ecological risk index of the hexachlorobenzene content in aqueous phase, gas phase and solid phase in soil has been built, has been represented respectively with W, F and S；Based on not
The extent of injury being likely to result in hexachloro-benzene in phase to biology is different, distributes to three-phase discharge to hexachloro-benzene pollution effect in soil
The different weight of risk index, finally gives the comprehensive ecological risk index Q that hexachlorobenzene content is caused in each relative soil
It is determined, Q=ζ W+ η F+ θ S, in formula, ζ, η and θ are respectively aqueous phase, gas phase and the discharge of solid phase three-phase to hexachloro-benzene in soil
Weighted value, the comprehensive ecological risk index R of hexachlorobenzene content in soil to be measured is tried to achieve according to described model, is evaluated according to R values
The pollution level of hexachloro-benzene in soil；
（3）The method detected using gas chromatography-electron capture detector is detected to the hexachlorobenzene content in soil, and is painted
Detection curve processed, experiment with computing is carried out to the hexachlorobenzene content in soil to the toxic effect of animal；
（4）The risk assessment for carrying out animal individual breathing contact hexachloro-benzene toxicity is calculated：R=Di × CSF, wherein, R is animal
Body is the poisoning strength factor for the suction BaP that USEPA recommends by breathing the health risk value of hexachloro-benzene, CSF, is constant 3.1
(mg/kg·d)-1。
Further, described hexachloro-benzene toxic factor is used for the toxic level and biological growth that reflect hexachloro-benzene to chlordene
The sensitivity of benzene content；Hexachloro-benzene pollution index characterizes the content and pollution level of single hexachloro-benzene；Hexachloro-benzene detects scale
The detected level in pedological unit weight to be measured is levied, is characterized with unit ng/g.
Further, described aqueous phase refers to the moisture flowed into soil to be measured, including irrigation water, surface water, discharge dirt
Water etc..
Further, described gas phase refers to the air within 10cm directly over soil to be measured, and detection range includes air
Conventional ingredient, standard-exceeding components, pollutant component, and each abnormal component source.
Further, described solid phase refers to the solid matter of upper soll layer 2-3cm to be measured covering, specifically refers to soil
In chemical impurity, have the solid chemical material of contamination to environment.
Further, described Di computational methods are：Di=CA×IR×ET×EF×EDBW×AT/24]]>, wherein：Di
For animal individual breathing dosage (mg/kg-day), EF is the hourage (hours/year) of animal individual year contact hexachloro-benzene, CA
For animal individual breathing contact hexachloro-benzene toxic equivalent concentration (mg/m3), ED is total number of days (days) of animal contact hexachloro-benzene,
IR is respiratory rate (m3/hour), and BW is whose body weight (kg), and ET is the hourage (hours/ that animal individual contacts hexachloro-benzene
Day), AT is individual mean lifetimes (days).
Further, the risk standard that described risk assessment standard is recommended according to U.S. EPA, i.e. R<10-6, table
Show that risk factor is not obvious；R represents dangerous degree between 10-6-10-4；R>10-4 indicates notable risk factor.
Further, the chromatographic condition of described gas chromatography-electron capture detector detection is：Injector temperature is
185 DEG C, electron capture detector temperature is 225 DEG C, and carrier gas is nitrogen, and purity 99.99%, flow velocity is 45ml/min, described gas
Phase chromatographic column heating schedule is：5min is kept when being warming up to 40 DEG C, then 160 DEG C, holding are warming up to 10 DEG C/min speed
2min, then 185 DEG C are warming up to 10 DEG C/min, keep 5min.
Further, described aqueous phase, gas phase and the discharge of solid phase three-phase are to weighted value ζ, η and θ of hexachloro-benzene in soil
Determine that method is as follows：
（1）Weight coefficient x, y and z that aqueous phase, gas phase and solid phase discharge influence on hexachloro-benzene in soil are judged respectively；X, y, z is
Determined using analytic hierarchy process (AHP), be a procedure parameter for calculating ζ, η and θ；
（2）According to the water around surveyed soil, air, solids environmental quality function zoning, by water, air, solids
Composition and carry out key words sorting with the relation of hexachloro-benzene, judged successively using analytic hierarchy process (AHP) its corresponding weight coefficient α, β,
γ, δ and ε；
（3）The weight coefficients of weight coefficient x, y and z that three-phase discharge influences on hexachloro-benzene in soil respectively with Different Effects classification
α, β, γ, δ are multiplied with ε, respectively obtain weight coefficient α i, β i, γ i, δ i and the ε of component content under three-phase water, air, solids
i；Due to being three phase spaces, i span is 1~3, and three phase spaces are represented respectively, and i=1 represents aqueous phase, and i=2 represent gas phase, i
=3 represent solid phase；I is corresponding with x, y and z；
（4）Determine soil class number A, B, C, D and E to be measured of different zones；
（5）Weighted arithmetic average a, b and the c of three-phase discharge to the weighing factor coefficient of hexachloro-benzene in soil are calculated, is carried out
Normalized, so as to obtain heavy metal weighted value ζ, η and θ of aqueous phase, gas phase and solid phase, a=α 1A+ β 1B+ γ 1C+ δ 1D+
1EA+B+C+D+E]]>b=α2A+β2B+γ2C+δ2D+ϵ2EA+B+C+D+E]]>c=α3A+β3B+γ3C+δ3D+ϵ3EA+B+C+D
+E]]>ξ=aa+b+c；η=ba+b+c；θ=ca+b+c]]>, ζ, η and θ are tried to achieve, so as to obtain three-phase discharge to hexachloro-benzene in soil
The weight distribution of influence.
Compared with prior art, beneficial effects of the present invention are embodied in：By building the assessment indicator system of science, it is determined that
Ecological risk index of the hexachlorobenzene content in aqueous phase, gas phase and solid phase, utilizes gas chromatography-electron capture detector in soil
The method of detection is detected to the hexachlorobenzene content in soil, and the hexachlorobenzene content in soil is entered to the toxic effect of animal
Row experiment with computing, the risk standard recommended finally according to U.S. EPA, to characterize three-phase discharge to hexachlorobenzene content in soil
Influence and its environmental pollution influence.The method design science of the present invention, is adapted to the soil six caused for industrial production
Chlorobenzene pollutant is studied, by combination of qualitative and quantitative analysis, the influence degree of exact evaluation pollution sources.
Brief description of the drawings
Fig. 1 is that the gas chromatography-electron capture detector of the embodiment of the present invention 2 detects that the gas-chromatography of obtained hexachloro-benzene class is bent
Line chart.
Embodiment
For ease of the understanding of the present invention, below in conjunction with explanation is further explained exemplified by specific embodiment, implement
Example does not constitute the restriction to the embodiment of the present invention.
Embodiment 1：A kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil, mainly including following
Step：
（1）Assessment indicator system is built：3 indexs of toxic factor, pollution index, detected level for choosing hexachloro-benzene in soil are built
Hexachloro-benzene pollutes combined influence evaluation model in soil；
（2）Three-phase discharges the determination to hexachloro-benzene pollution effect risk index in soil：According to described assessment indicator system, structure
Ecological risk index of the hexachlorobenzene content in aqueous phase, gas phase and solid phase in soil has been built, has been represented respectively with W, F and S；Based on not
The extent of injury being likely to result in hexachloro-benzene in phase to biology is different, distributes to three-phase discharge to hexachloro-benzene pollution effect in soil
The different weight of risk index, finally gives the comprehensive ecological risk index Q that hexachlorobenzene content is caused in each relative soil
It is determined, Q=ζ W+ η F+ θ S, in formula, ζ, η and θ are respectively aqueous phase, gas phase and the discharge of solid phase three-phase to hexachloro-benzene in soil
Weighted value, the comprehensive ecological risk index R of hexachlorobenzene content in soil to be measured is tried to achieve according to described model, is evaluated according to R values
The pollution level of hexachloro-benzene in soil；
（3）The method detected using gas chromatography-electron capture detector is detected to the hexachlorobenzene content in soil, and is painted
Detection curve processed, experiment with computing is carried out to the hexachlorobenzene content in soil to the toxic effect of animal；
（4）The risk assessment for carrying out animal individual breathing contact hexachloro-benzene toxicity is calculated：R=Di × CSF, wherein, R is animal
Body is the poisoning strength factor for the suction BaP that USEPA recommends by breathing the health risk value of hexachloro-benzene, CSF, is constant 3.1
(mg/kg·d)-1。
Wherein, described hexachloro-benzene toxic factor is used to reflect that the toxic level and biological growth of hexachloro-benzene contain hexachloro-benzene
The sensitivity of amount；Hexachloro-benzene pollution index characterizes the content and pollution level of single hexachloro-benzene；Hexachloro-benzene detected level is characterized and treated
The detected level surveyed in pedological unit weight, is characterized with unit ng/g.Described aqueous phase refers to the moisture flowed into soil to be measured, bag
Include irrigation water, surface water, sewage effluent etc..Described gas phase refers to the air within 10cm directly over soil to be measured, detects model
Enclose the source of the conventional ingredient including air, standard-exceeding components, pollutant component, and each abnormal component.Described solid phase refers to
The solid matter of upper soll layer 2-3cm to be measured covering, specifically refers to the chemical impurity in soil, has contamination to environment
Solid chemical material.Described Di computational methods are：Di=CA×IR×ET×EF×EDBW×AT/24]]>, wherein：Di is
Thing individual breathing dosage (mg/kg-day), EF is the hourage (hours/year) of animal individual year contact hexachloro-benzene, and CA is
Thing individual breathing contact hexachloro-benzene toxic equivalent concentration (mg/m3), ED is total number of days (days) of animal contact hexachloro-benzene, and IR is
Respiratory rate (m3/hour), BW is whose body weight (kg), and ET is the hourage (hours/day) that animal individual contacts hexachloro-benzene,
AT is individual mean lifetimes (days).The risk standard that described risk assessment standard is recommended according to U.S. EPA, i.e. R<
10-6, represents that risk factor is not obvious；R represents dangerous degree between 10-6-10-4；R>10-4 indicates notable risk factor.
The chromatographic condition of described gas chromatography-electron capture detector detection is：Injector temperature is 185 DEG C, electron capture detection
Device temperature is 225 DEG C, and carrier gas is nitrogen, and purity 99.99%, flow velocity is 45ml/min, described gas chromatographic column heating schedule
For：5min is kept when being warming up to 40 DEG C, then 160 DEG C are warming up to 10 DEG C/min speed, 2min is kept, then with 10 DEG C/min
185 DEG C are warming up to, 5min is kept.
Wherein, described aqueous phase, gas phase and solid phase three-phase discharge the determination to weighted value ζ, η and θ of hexachloro-benzene in soil
Method is as follows：
（1）Weight coefficient x, y and z that aqueous phase, gas phase and solid phase discharge influence on hexachloro-benzene in soil are judged respectively；X, y, z is
Determined using analytic hierarchy process (AHP), be a procedure parameter for calculating ζ, η and θ；
（2）According to the water around surveyed soil, air, solids environmental quality function zoning, by water, air, solids
Composition and carry out key words sorting with the relation of hexachloro-benzene, judged successively using analytic hierarchy process (AHP) its corresponding weight coefficient α, β,
γ, δ and ε；
（3）The weight coefficients of weight coefficient x, y and z that three-phase discharge influences on hexachloro-benzene in soil respectively with Different Effects classification
α, β, γ, δ are multiplied with ε, respectively obtain weight coefficient α i, β i, γ i, δ i and the ε of component content under three-phase water, air, solids
i；Due to being three phase spaces, i span is 1~3, and three phase spaces are represented respectively, and i=1 represents aqueous phase, and i=2 represent gas phase, i
=3 represent solid phase；I is corresponding with x, y and z；
（4）Determine soil class number A, B, C, D and E to be measured of different zones；
（5）Weighted arithmetic average a, b and the c of three-phase discharge to the weighing factor coefficient of hexachloro-benzene in soil are calculated, is carried out
Normalized, so as to obtain heavy metal weighted value ζ, η and θ of aqueous phase, gas phase and solid phase, a=α 1A+ β 1B+ γ 1C+ δ 1D+
1EA+B+C+D+E]]>b=α2A+β2B+γ2C+δ2D+ϵ2EA+B+C+D+E]]>c=α3A+β3B+γ3C+δ3D+ϵ3EA+B+C+D
+E]]>ξ=aa+b+c；η=ba+b+c；θ=ca+b+c]]>, ζ, η and θ are tried to achieve, so as to obtain three-phase discharge to hexachloro-benzene in soil
The weight distribution of influence.
Embodiment 2：In evaluation method according to embodiment 1, the soil by industrial pollution of In A Certain Locality, Jiangsu Province is carried out
The detection of hexachloro-benzene pollutant, is mainly included the following steps that：
（1）Soil to be measured is tentatively extracted using the method for accelerated solvent extraction：Described soil natural to be measured is air-dried
Afterwards, its water content is less than 5%, then insert in crushing mixer and crush, cross 60 mesh sieves, be subsequently placed in accelerated solvent extraction pond
In, extracted with the organic solvent dichloromethane of 4 times of quality of soil to be measured, obtain the preliminary extract of soil to be measured, accelerated molten
Agent extracting process consumption of organic solvent is few, quick, matrix influences the small, rate of recovery high and favorable reproducibility；
（2）The solution that soil to be measured is tentatively extracted is purified：Composite chromatography post is eluted in advance with n-hexane, toward compound chromatographic column
It is middle to add the preliminary extract of soil to be measured, eluted with ethyl acetate and hexamethylene mixed solution, the body of ethyl acetate and hexamethylene
Product is than the mixed liquor for 1: 1, and flow velocity is 5.5mL/min, collects chromatographic solution 45min, refined solution is obtained, then by obtained purifying
After liquid via hole diameter is 0.65 μm of polyvinylidene fluoride microporous filtering film filtering, deposit in sealed brown glass container, it is standby；
（3）SPE membrane extraction is carried out to refined solution, and obtains petroleum ether dissolution liquid：Described refined solution is taken with 20mL/min
Speed by the solid-phase extraction membrane through overactivation, SPE membrane area is big, it is not easy to block, and solution is by rear, very
Empty pumping vacuum solid-phase extraction membrane 7.5min, removes the residual moisture in solid-phase extraction membrane, then successively with 4 times of amounts of extract solution
The acetone of volume, the hexamethylene of 5 times of amount volumes are eluted, the analyte being enriched with to elute in solid-phase extraction membrane, wherein using ring
Hexane is eluted 2 times repeatedly, eluent is collected, after the eluent being collected into is dehydrated with anhydrous sodium sulfate, in pump vacuum degree
At 0.1MPa, 40 DEG C of bath temperature, it is evaporated to dryness with Rotary Evaporators, the Volume Changes of solution, add and steam before and after record evaporation
The petroleum ether dissolution of 3 times of amounts of solution, obtains petroleum ether dissolution liquid after hair；
（4）Gas chromatography-electron capture detector is detected：
A. each μ l injecting chromatographs of standard liquid 5 of hexachloro-benzene standard series are drawn respectively, according to the gas-chromatography-electronics set
Acquisition detector condition is detected, records hexachloro-benzene chromatogram peak height（mm）, with a height of ordinate of chromatographic peak, with corresponding chlordene
Benzene concentration is that abscissa draws standard curve；Then the sample petroleum ether dissolution liquid injecting chromatograph after 5 μ l concentrations is drawn, is measured
Hexachloro-benzene chromatogram peak height, and corresponding data drafting empirical curve is marked, as shown in Figure 1；
B. chlordene benzene concentration in soil is calculated（μg/kg）=x1000
In formula：C is the concentration of hexachloro-benzene on standard curve（μg/ml）；
V accumulates for petroleum ether dissolution liquid（ml）；
Cycles of concentration of the solution for solution before evaporation after A evaporations；
W is pedotheque weight to be measured（g）.
Embodiment 3：According to embodiment 2 to the detection method of hexachloro-benzene pollutant in soil and the institute of embodiment 1
The influence evaluation method of hexachlorobenzene content is verified in the soil stated：
Research shows, before aqueous phase and solid phase come for potential information requirement coefficient caused by the influence of hexachlorobenzene content in soil
Before gas phase；Hexachloro-benzene pollutant is higher in the content of solid phase, therefore draws solid phase hexachloro-benzene pollutant for ecological risk
Grade is extremely strong, and aqueous phase is taken second place, and gas phase influence is weaker, therefore hexachloro-benzene solid pollutant has larger ecological danger for soil
Evil.
Finally illustrate：It is that, for the ease of understanding embodiments of the invention, the present invention can also have using above-mentioned technical proposal
Other embodiment, protection scope of the present invention is not limited to this.Without departing from the spirit and substance of the case in the present invention, affiliated skill
The technical staff in art field works as can make various corresponding changes and deformation according to the present invention, but these corresponding changes and deformation
Belong to the scope of the claims of the present invention.
Claims (8)
1. a kind of discharged to the influence evaluation method of hexachlorobenzene content in soil based on three-phase, it is characterised in that it is main include with
Lower step：
（1）Assessment indicator system is built：3 indexs of toxic factor, pollution index, detected level for choosing hexachloro-benzene in soil are built
Hexachloro-benzene pollutes combined influence evaluation model in soil；
（2）Three-phase discharges the determination to hexachloro-benzene pollution effect risk index in soil：According to described assessment indicator system, structure
Ecological risk index of the hexachlorobenzene content in aqueous phase, gas phase and solid phase in soil has been built, has been represented respectively with W, F and S；Based on not
The extent of injury being likely to result in hexachloro-benzene in phase to biology is different, distributes to three-phase discharge to hexachloro-benzene pollution effect in soil
The different weight of risk index, finally gives the comprehensive ecological risk index Q that hexachlorobenzene content is caused in each relative soil
It is determined, Q=ζ W+ η F+ θ S, in formula, ζ, η and θ are respectively aqueous phase, gas phase and the discharge of solid phase three-phase to hexachloro-benzene in soil
Weighted value, the comprehensive ecological risk index R of hexachlorobenzene content in soil to be measured is tried to achieve according to described model, is evaluated according to R values
The pollution level of hexachloro-benzene in soil；
（3）The method detected using gas chromatography-electron capture detector is detected to the hexachlorobenzene content in soil, and is painted
Detection curve processed, experiment with computing is carried out to the hexachlorobenzene content in soil to the toxic effect of animal；
（4）The risk assessment for carrying out animal individual breathing contact hexachloro-benzene toxicity is calculated：R=Di × CSF, wherein, R is animal
Body is the poisoning strength factor for the suction BaP that USEPA recommends by breathing the health risk value of hexachloro-benzene, CSF, is constant 3.1
(mg/kg·d)-1。
2. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described hexachloro-benzene toxic factor is used for the toxic level and biological growth that reflect hexachloro-benzene to the quick of hexachlorobenzene content
Sense degree；Hexachloro-benzene pollution index characterizes the content and pollution level of single hexachloro-benzene；Hexachloro-benzene detected level characterizes soil to be measured
Detected level in Unit Weight, is characterized with unit ng/g.
3. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described aqueous phase refers to the moisture flowed into soil to be measured.
4. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described gas phase refers to the air within 10cm directly over soil to be measured.
5. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described solid phase refers to the solid matter of upper soll layer 2-3cm to be measured covering.
6. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described Di computational methods are：Di=CA×IR×ET×EF×EDBW×AT/24]]>, wherein：Di is animal individual
Dosage (mg/kg-day) is breathed, EF is the hourage (hours/year) of animal individual year contact hexachloro-benzene, and CA is animal individual
Breathing contact hexachloro-benzene toxic equivalent concentration (mg/m3), ED is total number of days (days) of animal contact hexachloro-benzene, and IR is breathing speed
Rate (m3/ hour), BW is whose body weight (kg), and ET is the hourage (hours/day) that animal individual contacts hexachloro-benzene, and AT is individual
Body average life span (days).
7. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, the risk standard that described risk assessment standard is recommended according to U.S. EPA, i.e. R<10-6, represents risk factor not
Substantially；R represents dangerous degree between 10-6-10-4；R>10-4 indicates notable risk factor.
8. a kind of influence evaluation method discharged based on three-phase to hexachlorobenzene content in soil as claimed in claim 1, it is special
Levy and be, described aqueous phase, gas phase and the discharge of solid phase three-phase to the determination method of weighted value ζ, η and θ of hexachloro-benzene in soil such as
Under：
（1）Weight coefficient x, y and z that aqueous phase, gas phase and solid phase discharge influence on hexachloro-benzene in soil are judged respectively；X, y, z is
Determined using analytic hierarchy process (AHP), be a procedure parameter for calculating ζ, η and θ；
（2）According to the water around surveyed soil, air, solids environmental quality function zoning, by water, air, solids
Composition and carry out key words sorting with the relation of hexachloro-benzene, judged successively using analytic hierarchy process (AHP) its corresponding weight coefficient α, β,
γ, δ and ε；
（3）The weight coefficients of weight coefficient x, y and z that three-phase discharge influences on hexachloro-benzene in soil respectively with Different Effects classification
α, β, γ, δ are multiplied with ε, respectively obtain the weight coefficient α i of component content under three-phase water, air, solids, β i, γ i, δ i and
εi；Due to being three phase spaces, i span is 1~3, and three phase spaces are represented respectively, and i=1 represents aqueous phase, and i=2 represent gas phase,
I=3 represent solid phase；I is corresponding with x, y and z；
（4）Determine soil class number A, B, C, D and E to be measured of different zones；
（5）Weighted arithmetic average a, b and the c of three-phase discharge to the weighing factor coefficient of hexachloro-benzene in soil are calculated, is carried out
Normalized, so as to obtain heavy metal weighted value ζ, η and θ of aqueous phase, gas phase and solid phase, a=α 1A+ β 1B+ γ 1C+ δ 1D+
1EA+B+C+D+E]]>b=α2A+β2B+γ2C+δ2D+ϵ2EA+B+C+D+E]]>c=α3A+β3B+γ3C+δ3D+ϵ3EA+B+C+D
+E]]>ξ=aa+b+c；η=ba+b+c；θ=ca+b+c]]>, ζ, η and θ are tried to achieve, so as to obtain three-phase discharge to hexachloro-benzene in soil
The weight distribution of influence.
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