Method for estimating heavy metal concentration in soil

A technology for heavy metals and soils, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problem of low prediction accuracy and achieve the effect of saving financial and material resources

Pending Publication Date: 2020-02-25
JINAN UNIVERSITY
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Problems solved by technology

[0005] To this end, the embodiment of the present invention provides a method for estimating the concentration of heavy metals in soil. By integrating the physical and chemical properties of sampling points such as soil pH, cation exchange capacity, and organic matter content, and the altitude of the area as parameters, the correlation between heavy metal content and environmental factors is established. , realize the pred

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  • Method for estimating heavy metal concentration in soil
  • Method for estimating heavy metal concentration in soil
  • Method for estimating heavy metal concentration in soil

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Embodiment 1

[0032] The invention provides a method for estimating the concentration of heavy metals in soil, the specific steps are as follows:

[0033] S1. Collect the pH value, cation exchange capacity, organic carbon content and altitude data of the soil sampling points. The pH value, cation exchange capacity and organic carbon content of the soil sampling points are all measured through experiments. The altitude of the sampling points is queried through GoogleEarth get;

[0034] S2. Using multiple regression analysis to establish a mathematical model, establish a linear relationship between the concentration of heavy metals and the physical and chemical properties of the soil, and realize the prediction of the concentration of heavy metals.

[0035] The multiple regression equation is:

[0036]

[0037]

[0038] y=b 0 +b 1 x 1 +b 2 x 2 +b 3 x 3 +b 4 x 4

[0039] Among them, k is the value of the kth environmental parameter related to the concentration of heavy metals,...

Embodiment 2

[0045] The multiple regression equation is:

[0046]

[0047]

[0048] y=b 0 +b 1 x 1 +b 2 x 2 +b 3 x 3 +b 4 x 4 ,

[0049] The linear regression equation is one of the statistical analysis methods that use regression analysis in mathematical statistics to determine the interdependent quantitative relationship between two or more variables. It is widely used, and there is a linear correlation between random variables and variables. relationship, then the points (x, y) obtained by the experimental data will be scattered around a certain straight line, so it can be considered that the type of the regression function is a linear function. Specifically in this embodiment, k is the kth one that is related to the concentration of heavy metals The value of environmental parameters, n is the number of soil heavy metal sampling points, x ik is the value of the kth environmental parameter of the i-th sampling point soil, y i is the Ni concentration of the i-th soil heavy ...

Embodiment 3

[0054] The actual measured value of soil heavy metals used in the present invention was sampled in Guiyu Town, Chaoyang District, Shantou City, Guangdong Province in August 2017, and was then measured by an inductively coupled plasma mass spectrometer (ICP-MS) after microwave digestion. 60 points, the detailed steps are:

[0055] 1) According to the GPS positioning to reach a specific area, use the five-point sampling method to collect about 500g of 20cm soil samples, wrap it in kraft paper, and label it;

[0056] 2) The soil sample was air-dried naturally, ground with a ceramic mortar, and then passed through a 100-mesh sieve;

[0057] 3) Take 0.1g soil sample, put it into a Teflon tube with 5mL aqua regia and 1mL hydrofluoric acid, both of which are analytically pure, and digest it with a microwave digestion instrument, then evaporate it to 1mL with an acid catcher, and use an ultra- Dilute pure water to 40mL, to be tested;

[0058] 4) On the machine, use an inductively co...

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Abstract

The embodiment of the invention discloses a method for estimating heavy metal concentration in soil and particularly relates to the technical field of soil heavy metal detection. The specific steps are as follows: S1, a pH value at a soil sampling point, a cation exchange capacity, a content of organic carbon and altitude data of the sampling point are collected; S2, a mathematical model is established by the multiple regression analysis method, and a linear relationship between the heavy metal concentration and soil physicochemical properties is established; S3, the required parameters are input into the formula to obtain the estimated heavy metal concentration at the point; S4, the consistency between the predicted result and the measured value of the heavy metal in soil is checked. By synthesizing the physicochemical properties of the sampling point such as the soil pH, the cation exchange capacity and the organic matter content and the regional altitude as parameters, the correlativity between the heavy metal content and environmental factors is established; the heavy metal concentration around a survey region is predicted; the method is more scientific and effective; the reference is provided for the regional environmental pollution degree; and a scientific basis is provided for environmental control in the future.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of soil heavy metal detection, and in particular to a method for estimating the concentration of soil heavy metals. Background technique [0002] Heavy metal pollution in soil means that due to human activities, the content of trace metal elements in the soil in the soil exceeds the background value, and the content is too high caused by excessive deposition. Heavy metals refer to metals with a specific gravity equal to or greater than 5.0, such as Fe, Mn, Zn , Cd, Hg, Ni, Co, etc. As is a metalloid, but because its chemical properties and environmental behavior are similar to heavy metals, arsenic is often included when discussing heavy metals, and some directly include it in In the range of heavy metals, due to the high content of iron and manganese in soil, they are generally considered not to be soil pollution elements. However, under strong reducing conditions, the toxicity cau...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/62
Inventor 亦如瀚杨东升陈铭聪连逸轩
Owner JINAN UNIVERSITY
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