CN-121741156-B - Soil heavy metal pollution restoration effect detection and evaluation method and device

CN121741156BCN 121741156 BCN121741156 BCN 121741156BCN-121741156-B

Abstract

The invention relates to the technical field of heavy metal detection, in particular to a detection and evaluation method and a device for the remediation effect of heavy metal pollution of soil, wherein the accuracy of the concentration of each active heavy metal at each sampling moment is obtained by analyzing the noise influence degree of the concentration of each active heavy metal at each monitoring period, analyzing the concentration change condition of different valence states of each heavy metal in a soil sample obtained at the sampling moment before and after each monitoring period and analyzing the concentration change rule degree of each active heavy metal obtained at all depth sampling positions at each sampling moment; and finally, correcting the concentration of each active heavy metal at each sampling moment by analyzing the pH value change condition at the adjacent sampling moment and combining the accuracy. The concentration of the corrected active heavy metal obtained by the method is more real and reliable, can reflect the pollution evolution trend of the active heavy metal, and provides a reliable basis for restoration effect evaluation and concentration correction.

Inventors

BI WEITAO
Xi Miaoqi
XU HAO
BAI JIALONG
LingHu Ermin
MA RUIJIE
ZHANG BOLUN

Assignees

陕西交控新材料有限公司
青海华烯银鼎环保科技有限公司
陕西交控资源开发集团有限公司销售分公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (10)

1. The method for detecting and evaluating the remediation effect of the heavy metal pollution of the soil is characterized by comprising the following steps: Obtaining soil samples with different depths at different sampling moments, obtaining the concentration of each active state heavy metal in the soil samples, and monitoring the soil environment at the sampling position of the surface layer; Aiming at a soil sample on the surface layer, obtaining the difference between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period and the variation between the soil environments, and obtaining the noise influence degree of each active state heavy metal concentration in each monitoring period; Analyzing the concentration change conditions of different valence states of each heavy metal in the soil sample obtained at sampling moments before and after each monitoring period aiming at the soil sample on the surface layer, and obtaining the correction requirement degree of the concentration of each active heavy metal in each monitoring period by combining the noise influence degree; Analyzing the concentration change rule degree of each active state heavy metal obtained at all depth sampling positions at each sampling moment, and combining the correction requirement degree to obtain the accuracy of the concentration of each active state heavy metal at each sampling moment; Analyzing the pH value change condition of adjacent sampling moments, and correcting the concentration of each active state heavy metal at each sampling moment by combining the accuracy; obtaining the noise influence degree of each active state heavy metal concentration in each monitoring period comprises the following steps: The time interval between two adjacent soil samples is recorded as a monitoring time interval, the sampling time of two adjacent soil samples is recorded as the sampling time before and after the monitoring time interval, namely, the time interval is divided into a plurality of monitoring time intervals; calculating the absolute value of the difference value between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period aiming at the soil sample on the surface layer to obtain the difference value between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period; Calculating the absolute value of the difference between the soil environments corresponding to the sampling moments before and after each monitoring period, and normalizing the absolute value of the difference between the soil environments to obtain the standardized variation between the soil environments corresponding to the sampling moments before and after each monitoring period; obtaining the noise influence degree of each active state heavy metal concentration in each monitoring period according to the difference between each active state heavy metal concentration and the standardized variation between all soil environments; Construction of the first The noise influence degree calculation formula of the active state heavy metal concentration in each monitoring period is as follows: In the formula, Represent the first Noise influence degree of active state heavy metal concentration of each monitoring period; soil sample showing surface layer at the first The difference between the concentrations of the active heavy metals corresponding to the sampling moments before and after the monitoring period; Represent the first The first sampling time corresponds to the sampling time before and after the monitoring period Standardized variation between seed soil environments; Representing the number of all soil environment types; The denominator correction parameters are represented, the dimension of the denominator correction parameters is the same as that of the denominator, and the value of the denominator correction parameters is a minimum value larger than 0; obtaining corrected demand levels for each active heavy metal concentration for each monitoring period, comprising: Determining the valence states of the active heavy metals in the soil sample, which can be converted with each other; acquiring the concentration variation of each valence state of active heavy metal in a soil sample obtained at sampling moments before and after each monitoring period; according to the concentration change conditions of different valence states of each heavy metal, combining the noise influence degree to obtain the correction demand degree of the concentration of each active state heavy metal in each monitoring period; Construction of the first The calculation formula of the correction demand degree of the active state heavy metal concentration in each monitoring period is as follows: In the formula, Represent the first Correction demand degrees of active state heavy metal concentration in each monitoring period; Represent the first The concentration variation of one valence state corresponding to sampling time before and after each monitoring period; First, the The concentration variation of the other valence state corresponding to the sampling time before and after each monitoring period; The representation takes absolute value; representing a linear normalization function.
2. The method for detecting and evaluating the effect of restoring heavy metal pollution to soil according to claim 1, wherein obtaining soil samples of different depths at different sampling moments, obtaining the concentration of each active state heavy metal in the soil samples, and monitoring the soil environment at the sampling position, comprises: selecting a sampling place, and setting sampling positions on soil layers with different depths of the sampling place; Soil sampling is carried out for each sampling position at intervals of a certain time to obtain soil samples with different depths at different sampling moments; detecting the concentration of each active state heavy metal in the soil sample by a spectrometry method, and combining a heavy metal spectrum standard curve to obtain the concentration of each active state heavy metal; and setting a sensor at a sampling position of the soil surface layer, and monitoring the soil environment at the sampling position of the surface layer.
3. The method for detecting and evaluating the effect of restoring heavy metal pollution to soil according to claim 1, wherein obtaining the difference between the concentration of each active state heavy metal and the variation between the soil environments corresponding to the sampling time before and after each monitoring period comprises: The time interval between two adjacent soil samples is recorded as a monitoring time interval, and the sampling time of two adjacent soil samples is recorded as the sampling time before and after the monitoring time interval; Calculating the absolute value of the difference value between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period to obtain the difference value between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period; Calculating the absolute value of the difference between the soil environments corresponding to the sampling moments before and after each monitoring period, and carrying out normalization processing on the absolute value of the difference between the soil environments to obtain the standardized variation between the soil environments corresponding to the sampling moments before and after each monitoring period.
4. The method for detecting and evaluating the remediation effect of the heavy metal pollution in the soil according to claim 3, wherein analyzing the concentration change conditions of different valence states of the heavy metal in the soil sample obtained at sampling moments before and after each monitoring period comprises: determining the interconvertible valence states of the active heavy metals in the soil sample; acquiring the concentration variation of each valence state of active heavy metal in the soil sample, which is acquired at sampling moments before and after each monitoring period; and comparing the magnitude relation between the concentration variation amounts corresponding to the two valence states which can be mutually converted of the active heavy metal to obtain the concentration variation conditions of the heavy metal in different valence states in the soil sample, which are obtained at sampling moments before and after each monitoring period.
5. The method for detecting and evaluating the remediation effect of the heavy metal pollution in the soil according to claim 3, wherein the analysis of the degree of change regularity of the concentration of the active heavy metal obtained at all the depth sampling positions at each sampling time comprises the following steps: And calculating the ratio of the concentration of each active state heavy metal obtained at all adjacent depth sampling positions at each sampling moment to obtain the concentration change rule degree of the active state heavy metal obtained at all the depth sampling positions at each sampling moment.
6. The method for detecting and evaluating the remediation effect of the heavy metal pollution in the soil according to claim 5, wherein analyzing the degree of change regularity of the concentration of the active heavy metal obtained at all the depth sampling positions at each sampling time, and combining the correction requirement degree, obtaining the accuracy of the concentration of each active heavy metal at each sampling time comprises the following steps: analyzing the concentration change rule degree of the active heavy metal obtained at all the depth sampling positions at each sampling moment; calculating the average value of the concentration change rule degree corresponding to the sampling time before and after each monitoring period, and combining the correction requirement degree to obtain the accuracy of each active heavy metal concentration in each monitoring period; and obtaining the accuracy of the concentration of each active heavy metal at each sampling moment according to the accuracy of the concentration of each active heavy metal at each monitoring period.
7. The method for detecting and evaluating the remediation effect of the heavy metal pollution of the soil according to claim 1, wherein analyzing the pH change condition of adjacent sampling moments and correcting the concentration of each active heavy metal at each sampling moment according to the accuracy comprises: Calculating the difference value of the pH value corresponding to any sampling time and the previous sampling time to obtain a symbol weight; According to the symbol weight and the accuracy, a correction coefficient of each active state heavy metal concentration at each sampling moment is obtained; and correcting the concentration of each active state heavy metal at each sampling time according to the correction coefficient to obtain the corrected concentration of each active state heavy metal at each sampling time.
8. The method for detecting and evaluating the effect of restoring soil heavy metal pollution according to claim 7, wherein each active state heavy metal concentration is corrected at each sampling time, and further comprising: traversing all active state heavy metals at each sampling moment, and summing the corrected concentrations to obtain the total corrected concentration of all active state heavy metals at each sampling moment; and traversing all sampling moments for each time period, and averaging the total corrected concentration to obtain the average total corrected concentration of all active heavy metals in each time period.
9. The device for detecting and evaluating the remediation effect of the heavy metal pollution of the soil is characterized by comprising a memory and a processor, wherein: the memory is used for storing program codes; The processor is configured to read the program code stored in the memory and execute the soil heavy metal pollution remediation effect detection and evaluation method according to any one of claims 1 to 8.
10. The soil heavy metal pollution remediation effect detection and assessment device of claim 9, wherein the processor comprises: The soil collection module is used for obtaining soil samples with different depths at different sampling moments, obtaining the concentration of each active state heavy metal in the soil samples, and monitoring the soil environment of the surface layer at the sampling moments; The noise influence analysis module is used for acquiring the difference between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period and the variation between the soil environments according to the soil sample on the surface layer to obtain the noise influence degree of each active state heavy metal concentration in each monitoring period; The system comprises a result authenticity analysis module, a correction requirement degree and an accuracy degree, wherein the result authenticity analysis module is used for analyzing the concentration change condition of different valence states of each heavy metal in a soil sample obtained at sampling moments before and after each monitoring time period aiming at the soil sample of the surface layer, combining the noise influence degree to obtain the correction requirement degree of the concentration of each active state heavy metal in each monitoring time period, and analyzing the concentration change rule degree of each active state heavy metal obtained at all depth sampling positions at each sampling time period, combining the correction requirement degree to obtain the accuracy degree of the concentration of each active state heavy metal at each sampling time period; and the concentration correction module is used for analyzing the pH value change condition of adjacent sampling moments and correcting the concentration of each active heavy metal at each sampling moment by combining the accuracy.

Description

Soil heavy metal pollution restoration effect detection and evaluation method and device Technical Field The invention relates to the technical field of heavy metal detection, in particular to a method and a device for detecting and evaluating the remediation effect of soil heavy metal pollution. Background With the development of industrialization, urbanization and agriculture intensification, activities such As mining, smelting and processing, electroplating and spraying, chemical fertilizer and pesticide application and the like lead a large amount of heavy metals such As lead (Pb), cadmium (Cd), mercury (Hg), arsenic (As), chromium (Cr) and the like to enter the soil environment, so that heavy metal pollution of the soil is serious, and the method has become one of the key fields of ecological environment management in China currently. In order to improve the quality of soil environment, a great deal of measures such as phytoremediation, stabilization/solidification, leaching, chemical passivation, combined remediation and the like are adopted in recent years to treat the polluted site. Based on the detection mode of conventional sampling-laboratory chemical analysis, although the total concentration of heavy metals in soil can be obtained, the obtained detection data cannot truly reflect the actual pollution level of the heavy metals in the soil, and particularly the ecological risk, biological effectiveness and migration potential of the heavy metals are difficult to reflect, so that the heavy metal pollution in the soil needs to be analyzed by adopting the concentration of active heavy metals in the soil. However, when the concentration of the active heavy metal in the soil is detected, the detection result may be interfered by external environmental factors, so that the detection concentration of the active heavy metal at each moment is changed, and the external environmental factors also affect the evolution trend of the concentration of the active heavy metal, so that the authenticity of the detected concentration of the active heavy metal cannot be accurately judged. In addition, the migration, adsorption, complexation and other processes of heavy metals in soil have dynamic property, but the traditional method generally only can acquire 'static' data at a certain moment, can not continuously track pollution change, and can not accurately reflect pollution evolution trend. These problems directly lead to deviation of the existing detection result, and are difficult to provide reliable basis for heavy metal pollution repair effect evaluation and concentration correction. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a method and a device for detecting and evaluating the remediation effect of heavy metal pollution of soil. According to a first aspect of the embodiment of the application, the provided method for detecting and evaluating the remediation effect of the heavy metal pollution of the soil specifically comprises the following steps: Obtaining soil samples with different depths at different sampling moments, obtaining the concentration of each active state heavy metal in the soil samples, and monitoring the soil environment at the sampling position of the surface layer; Aiming at a soil sample on the surface layer, obtaining the difference between the concentration of each active state heavy metal corresponding to the sampling time before and after each monitoring period and the variation between the soil environments, and obtaining the noise influence degree of each active state heavy metal concentration in each monitoring period; Analyzing the concentration change conditions of different valence states of each heavy metal in the soil sample obtained at sampling moments before and after each monitoring period aiming at the soil sample on the surface layer, and obtaining the correction requirement degree of the concentration of each active heavy metal in each monitoring period by combining the noise influence degree; Analyzing the concentration change rule degree of each active state heavy metal obtained at all depth sampling positions at each sampling moment, and combining the correction requirement degree to obtain the accuracy of the concentration of each active state heavy metal at each sampling moment; And analyzing the pH value change condition of adjacent sampling moments, and correcting the concentration of each active heavy metal at each sampling moment by combining the accuracy. In some embodiments of the present invention, obtaining soil samples at different depths at different sampling times, obtaining a concentration of each active heavy metal in the soil samples, and monitoring a soil environment at a sampling location, comprising: selecting a sampling place, and setting sampling positions on soil layers with different depths of the sampling place; Soil sampling is carried out for each sampling position at intervals of a certai