CN105181760A - Method for judging pollution level of heavy metal polluted site by applying change rate of electrical resistivity - Google Patents
Method for judging pollution level of heavy metal polluted site by applying change rate of electrical resistivity Download PDFInfo
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- CN105181760A CN105181760A CN201510665953.4A CN201510665953A CN105181760A CN 105181760 A CN105181760 A CN 105181760A CN 201510665953 A CN201510665953 A CN 201510665953A CN 105181760 A CN105181760 A CN 105181760A
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Abstract
The invention discloses a method for judging a pollution level of a heavy metal polluted site by applying change rate of electrical resistivity. The method comprises the following steps: (1) measuring the electrical resistivity of a soil body of an unpolluted area of the site; (2) measuring the electrical resistivity of a soil body of a potential heavy metal polluted area of the site; (3) calculating the change rate of the electrical resistivity of the soil body of the polluted area relative to the soil body of the unpolluted area; (4) judging the heavy metal pollution level of the site according to the change rate of the electrical resistivity. The method disclosed by the invention has the advantages that quantification of heavy metal concentration and electrical resistivity values under the same condition is realized; the heavy metal pollution level of the soil body can be judged according to the change rate of the electrical resistivity; the method is in favor of rapid diagnosis on the heavy metal polluted site; a basis is provided for follow-up survey and management, and time and cost are greatly saved.
Description
Technical field
The invention belongs to environmental geotechnical technical field, be specifically related to a kind ofly apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree.
Background technology
China's Study on Soil Pollution Problems is day by day serious, particularly along with the adjustment of the industrial structure in recent years and the quickening of urbanization process, many contaminated sites that may work the mischief to health of human body have been left over after the resettlement of a large amount of industrial enterprises, if again develop, just need to carry out necessary investigation or reparation to these places.Space distribution and the concentration of understanding pollutant carry out contaminated site to administer and the prerequisite of repairing.Layout boring sampling, the laboratory chemical analysis of traditional scene can carry out the monitoring of contaminated site, and by comparison, the advantages such as resistivity method has fast, original position, economy, test specification are wide, resistivity method carries out the effective way of quick diagnosis to contaminated site by likely becoming.
What lot of domestic and international scholar investigated at contaminated site resistivity method should be used as a lot of basic works, by simulation laboratory test, native resistivity models research and related chemistry analysis, have accumulated valuable theoretical result, for resistivity method detection provides technical guarantee.But more existing resistivity methods are for judging that in soil, pollution range has certain research, but between resistivity and pollutant levels, the research of correlationship is also less, realize resistivity method quantification and differentiating that the research of pollution level needs to deepen further.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, there is provided a kind of and apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, the method is by utilizing the Polluted area soil body relative to the change in resistance rate of the uncontaminated region soil body to realize the judgement of place by heavy metal pollution degree.
The object of the invention realizes being completed by following technical scheme:
Apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, it is characterized in that, described method comprises the following step: (1) measures the resistivity of uncontaminated region, the place soil body; (2) resistivity of potential heavy metal pollution region, the place soil body is measured; (3) the change in resistance rate of the Polluted area soil body relative to the uncontaminated soil body is calculated; (4) degree of place by heavy metal pollution is judged according to change in resistance rate.
The assay method of the resistivity used in step (1) and step (2) is resistivity static sounding method, one or more in resistivity method, high-density electric, resistivity CT method, shop experiment determination method.
The computing method of described step (3) are: use the following formulae discovery Polluted area soil body relative to the change in resistance rate of the uncontamination region soil body:
Wherein,
for Polluted area is relative to uncontaminated region soil body change in resistance rate;
for Polluted area soil body resistivity, unit is Ω m;
for uncontaminated region soil body resistivity, unit is Ω m.
When described change in resistance rate is for being more than or equal to 0.3 and being less than 0.5, can judge that the contaminated grade of the soil body is slight pollution; When described change in resistance rate is for being more than or equal to 0.5 and being less than 0.8, can judge that the contaminated grade of the soil body is intermediate pollution; When described change in resistance rate is for being more than or equal to 0.8, can judge that the contaminated grade of the soil body is heavily contaminated.
Advantage of the present invention is, under realizing condition of the same race, the quantification of heavy metal concentration and resistivity value, optional resistivity rate of change judges the pollution level of the soil body by heavy metal pollution, be conducive to the quick diagnosis in heavy metal pollution place, for follow-up investigation, improvement provide foundation, greatly save time and cost.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram judging heavy metal pollution contaminated sites degree in the present invention;
Fig. 2 is the Polluted area soil body and uncontaminated region soil body static sounding resistivity curve map in the present invention;
Fig. 3 is the resistivity measurement result chart of place build-in test point position in the embodiment of the present invention 1;
Fig. 4 is for analyzing the test point position testing result chart drawn in boring with sampling Binding experiment room conventional in the embodiment of the present invention 1;
Fig. 5 is the chart preparing different heavy metal concentration gradient soil sample in the embodiment of the present invention 2;
Fig. 6 is the resistivity measurement result of different heavy metal concentration soil sample and the chart of change in resistance rate thereof in the embodiment of the present invention 2.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
Embodiment 1: as shown in Figure 1, the present embodiment is specifically related to a kind ofly apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, because the mensuration response of resistivity method heavy metal Polluted Soil is obvious, the quantification of heavy metal concentration and resistivity value under condition of the same race can be realized, therefore can realize judging that the soil body is subject to the degree of heavy metal pollution by the rate of change of resistivity, specifically comprise the steps:
(1) data of heavy metal contaminated site and field survey situation gather, the potential pollution region in preliminary judgement place, in regional choice one piece of uncontaminated region that distance heavy metal pollution place is nearer;
(2) measure the resistivity of the different depth soil body in uncontaminated region, resistivity measurement result as shown in Figure 3, gets the resistivity mean value of the variant degree of depth soil body afterwards
as data analysis foundation, measuring the method for resistivity can be one or more in resistivity static sounding method, resistivity method, high-density electric, resistivity CT method, shop experiment determination method, and in the present embodiment, the concrete resistivity static sounding that adopts carries out determination of resistivity;
(3) adopt resistivity static sounding method to measure the resistivity of the different depth soil body in Polluted area, resistivity measurement result as shown in Figure 3, gets the resistivity mean value of the variant degree of depth soil body afterwards
as data analysis foundation;
(4) the static sounding resistivity curve map in Polluted area and uncontamination region in place as shown in Figure 2, is drawn; As shown in Figure 3, the change in resistance rate of the Polluted area soil body compared to the uncontaminated region soil body is calculated according to following formula afterwards:
Wherein:
for the Polluted area soil body is relative to the change in resistance rate (%) of the uncontaminated region soil body;
for Polluted area soil body resistivity, unit is Ω m;
for uncontaminated region soil body resistivity, unit is Ω m;
(5) as shown in Figure 3, judge the heavy metal pollution degree of Polluted area according to soil body change in resistance rate, decision criteria is:
A., when change in resistance rate is less than 0.3, can judge that the soil body is not comtaminated;
B., when change in resistance rate is for being more than or equal to 0.3 and being less than 0.5, tentatively can judge that the contaminated grade of the soil body is slight pollution;
C., when change in resistance rate is for being more than or equal to 0.5 and being less than 0.8, tentatively can judge that the contaminated grade of the soil body is intermediate pollution;
D., when change in resistance rate is for being more than or equal to 0.8, tentatively can judge that the contaminated grade of the soil body is serious pollution;
According to above-mentioned decision criteria, the resistivity at 1m place, Polluted area test point position is 0.11 relative to the change in resistance rate in uncontaminated region, therefore this degree of depth soil body is not comtaminated; The change in resistance rate at 3m place is 0.09, therefore this degree of depth soil body is not comtaminated; The change in resistance rate at 5m place is 0.28, therefore this degree of depth soil body is not comtaminated; In sum, therefore this Polluted area test point position place is not comtaminated.
As shown in Figure 3,4, the conclusion method adopted in the present embodiment drawn is compared with lab analysis comprehensive descision result in conjunction with boring with sampling with conventional, basically identical.
Embodiment 2: as shown in Figure 1, the present embodiment is specifically related to a kind ofly apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, specifically comprises the steps:
(1) adopt shop experiment determination method, choose Representative soil sample, measure its native state resistivity;
(2) Cu is chosen
2+representative heavy metal contaminants, adopt copper chloride solution, prepare uncontaminated soil sample, standard value soil sample respectively according to the times of ultra standard of " standard of soil environment quality " grade III Standard and exceed standard 1 times, exceed standard 2 times, exceed standard 6 times, exceed standard 10 times, exceed standard the pollution soil sample of 50 times, as shown in Figure 5;
Compound method is: get the uncontaiminated soil 500g sieved at every turn, and the concentration gradient preparation of the water percentage according to 30 ± 2% and setting is poured in soil sample containing heavy metal ion solution, stirs, puts into polybag and seal placement 24 hours;
(3) measure uncontaminated soil sample resistivity, standard value soil sample resistivity and exceed standard 1 times, exceed standard 2 times, exceed standard 6 times, exceed standard 10 times, exceed standard the resistivity of pollution soil sample of 50 times, test result is see as shown in Figure 6:
Standard value pollution soil sample change in resistance rate is less than 0.3 and belongs to uncontamination;
The 1 times of soil sample change in resistance rate that exceeds standard belongs to slight pollution between 0.3 (comprising) ~ 0.5;
The 2 times of soil sample change in resistance rates that exceed standard belong to intermediate pollution between 0.5 (comprising) ~ 0.8;
Exceed standard 6 times, exceed standard 10 times, the change in resistance rate of the 50 times of soil samples that exceed standard is more than or equal to 0.8 and belongs to serious pollution;
As can be seen here, above-mentioned test judged result conforms to the actual levels of pollution of soil sample, therefore the pollution level in heavy metal pollution place is reasonably feasible to utilize the rate of change of resistivity to judge.
Claims (4)
1. apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, it is characterized in that, described method comprises the following step: (1) measures the resistivity of uncontaminated region, the place soil body; (2) resistivity of potential heavy metal pollution region, the place soil body is measured; (3) the change in resistance rate of the Polluted area soil body relative to the uncontaminated soil body is calculated; (4) degree of place by heavy metal pollution is judged according to change in resistance rate.
2. according to claim 1ly a kind ofly apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, it is characterized in that, the assay method of the resistivity used in step (1) and step (2) is resistivity static sounding method, one or more in resistivity method, high-density electric, resistivity CT method, shop experiment determination method.
3. according to claim 1ly a kind ofly apply the method that change in resistance rate judges heavy metal pollution contaminated sites degree, it is characterized in that, the computing method of described step (3) are: use the following formulae discovery Polluted area soil body relative to the change in resistance rate of the uncontamination region soil body:
Wherein,
for Polluted area is relative to uncontaminated region soil body change in resistance rate;
for Polluted area soil body resistivity, unit is Ω m;
for uncontaminated region soil body resistivity, unit is Ω m.
4. a kind of according to claim 1 or 3 applies the method that change in resistance rate judges heavy metal pollution contaminated sites degree, it is characterized in that, when described change in resistance rate is for being more than or equal to 0.3 and being less than 0.5, can judge that the contaminated grade of the soil body is slight pollution; When described change in resistance rate is for being more than or equal to 0.5 and being less than 0.8, can judge that the contaminated grade of the soil body is intermediate pollution; When described change in resistance rate is for being more than or equal to 0.8, can judge that the contaminated grade of the soil body is heavily contaminated.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106706715A (en) * | 2016-12-26 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Polluted soil detection method based on three-dimensional high-density electrical resistivity method |
| CN106706673A (en) * | 2017-01-24 | 2017-05-24 | 东南大学 | Environment pore pressure static sounding probe for in-situ detection of heavy metal polluting components and concentration |
| CN106841322A (en) * | 2017-03-14 | 2017-06-13 | 上海市地矿工程勘察院 | Device and method for detecting water and soil pollution degree |
| CN109255543A (en) * | 2018-09-28 | 2019-01-22 | 中国环境科学研究院 | The judgment method of element pollution relative extent in a kind of land use pattern |
| CN109304351A (en) * | 2018-08-01 | 2019-02-05 | 广东省环境科学研究院 | A kind of device and method for four-dimensional tracking and injection rehabilitating soil and underground water |
| CN112505104A (en) * | 2020-12-15 | 2021-03-16 | 重庆商勤科技有限公司 | Resistance and polarization-based soil pollution analysis method and device and storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706715A (en) * | 2016-12-26 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Polluted soil detection method based on three-dimensional high-density electrical resistivity method |
| CN106706673A (en) * | 2017-01-24 | 2017-05-24 | 东南大学 | Environment pore pressure static sounding probe for in-situ detection of heavy metal polluting components and concentration |
| CN106841322A (en) * | 2017-03-14 | 2017-06-13 | 上海市地矿工程勘察院 | Device and method for detecting water and soil pollution degree |
| CN109304351A (en) * | 2018-08-01 | 2019-02-05 | 广东省环境科学研究院 | A kind of device and method for four-dimensional tracking and injection rehabilitating soil and underground water |
| CN109255543A (en) * | 2018-09-28 | 2019-01-22 | 中国环境科学研究院 | The judgment method of element pollution relative extent in a kind of land use pattern |
| CN112505104A (en) * | 2020-12-15 | 2021-03-16 | 重庆商勤科技有限公司 | Resistance and polarization-based soil pollution analysis method and device and storage medium |
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