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Method for evaluating data exception degree of heavy metal content in soil

A technology for abnormal data and heavy metals, applied in measurement devices, soil material testing, instruments, etc., can solve the problems of inability to identify abnormal data in soil heavy metal content data, misjudgment in soil remediation decision making, etc., and achieve accurate and reliable soil heavy metal survey data. , avoid chance and subjectivity, save the effect of testing cost

Active Publication Date: 2016-11-16
北京瑞美德环境修复有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that non-professionals cannot identify abnormal data in soil heavy metal content data due to lack of knowledge in mathematical statistics, geostatistics, and soil environment, and thus cause misjudgment in the process of soil pollution evaluation and soil restoration decision-making.

Method used

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  • Method for evaluating data exception degree of heavy metal content in soil
  • Method for evaluating data exception degree of heavy metal content in soil
  • Method for evaluating data exception degree of heavy metal content in soil

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Experimental program
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Effect test

Embodiment 1

[0039] In the step of collecting soil samples in step 1, on the basis of GPS positioning, the soil in Beijing can be used as the detection area, and the surface soil of 0-20 cm of the sample square can be collected with stainless steel soil drills and soil knives, and no foreign soil or backfill soil should be collected. , to remove man-made pollutants. Samples were collected according to a certain sampling route and the principle of "random" multi-point mixing. The number of sample points for each sampling unit shall not be less than 5 points. The thickness, depth, and width of the soil samples taken at each point should be roughly the same; each point is randomly determined. After observing the situation in the field, randomly fix the point to avoid subjective errors and improve the representativeness of the sample. Sampling is generally carried out according to the S-shaped line , using the 5-point sampling method, the 5 sampling points are composed of 4 vertices and the c...

Embodiment 2

[0041] In step 2, after the sample is collected, the pretreatment step is carried out, and it is naturally dried indoors, ground, and passed through a 100-mesh sieve. Obtain heavy metal content data according to national testing standards and relevant analysis methods. The detection methods are shown in the table below:

[0042] Table 1 Analysis and testing methods for soil heavy metals

[0043]

[0044] Obtain the soil heavy metal content data, import the content data into the system software, and use SQLServer software to create a database to store the value of the heavy metal content of each sample detected. For the absence of a certain heavy metal element at a certain sampling point, it will not participate in the verification operation of this heavy metal element; after loading the data, you need to select the heavy metal element to be verified; you need to set the corresponding parameter information for different verification methods.

Embodiment 3

[0046] In step 3, mathematical statistics verification mainly selects outliers based on the ideas of probability theory and mathematical statistics. In theory, without human interference, soil variables should conform to normal distribution or lognormal distribution, such as The content distribution of Cr and Ni in Beijing soil obeys normal distribution, and the distribution of Cd, Cu, Pb and Zn content obeys logarithmic normal distribution. M is the mean value of the data, S is the standard deviation of the data, when setting 2 times S, M-2S to M+2S is the 95% confidence interval. In this embodiment, a confidence interval of 95% is selected. According to the confidence interval, abnormal data outside the confidence interval can be selected, and information about the abnormal value can be obtained and stored.

[0047] The background verification method mainly combines the background value of soil heavy metal content, based on the idea of ​​probability theory and mathematical s...

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Abstract

The invention discloses a method for evaluating the data exception degree of the heavy metal content in soil. The method comprises the steps that a random multipoint mixing mode is adopted for collecting soil samples at first, and a plurality of soil samples are obtained; then, the soil samples are subjected preprocessing, the content of heavy metal is detected, and related data of the heavy metal content of the samples is stored into a database; mathematical statistics verification, background verification and space verification are adopted for processing the related stored data; statistics is performed on abnormal numerical values, and the abnormal numerical values are evaluated into three levels; the abnormal data is retested, corrected and updated. The problems that due to the lack of knowledge of mathematical statistics, geostatistics, soil environment sciences and the like of non-specialized persons, abnormal data in the soil heavy metal content data cannot be recognized are solved, and misjudgment can be reduced in the processes of soil pollution assessment, repair decision formulation and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a method for evaluating the abnormal degree of heavy metal content data in soil through various verification methods. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of the level of industrialization, the disorderly mining of metal mines and the unreasonable disposal of industrial waste, sewage irrigation, excessive use of chemical fertilizers, pesticides, etc. have caused serious heavy metal pollution in the soil, which in turn threatens the quality and safety of agricultural products, such as Hunan cadmium rice incident. The state attaches great importance to the remediation and treatment of heavy metal pollution in soil. Obtaining objective and real soil heavy metal content data is the basis for carrying out the above work. Due to the complex sources of soil heavy metals, the cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24G01N33/245
Inventor 杨军雷梅周小勇
Owner 北京瑞美德环境修复有限公司