Indoor spectral stratified measurement method for heavy metal elements in closed mine reclamation site

Abstract

The invention discloses an indoor spectral stratified measurement method for heavy metal elements in a closed mine reclamation site. The method comprises the following steps: S1, constructing a heavy metal element spatial distribution analysis model of a mine reclamation site, analyzing heavy metals in soil by adopting a multivariate stepwise regression model in geospatial regression, and analyzing the content of heavy metals in the soil by adopting a least square reduction model; S2, carrying out GIS gridding on the mine reclamation site, and sampling soil of multiple depths in each gridding area at the same time; and S3, carrying out hyperspectral data acquisition. According to the method, a self-built mathematical model and a computer system are adopted, sampling point detection data are utilized, multi-target geochemical survey and remote sensing data obtained from the outside are combined, and spatial distribution characteristics of detected heavy metal elements are analyzed through multiple stepwise regression and a least square regression model; and an accurate spatial distribution characteristic result of the heavy metal elements is obtained, so that treatment and utilization of the reclamation soil in the mining area by people are facilitated.

Description

technical field [0001] The invention relates to the fields of optical technology and resource environment technology, in particular to an indoor spectrum layered measurement method for heavy metal elements in a closed mine reclamation site. Background technique [0002] Filling materials for mine reclamation sites come from a wide range of sources, most of which are composed of coal gangue, fly ash, and domestic garbage. During mine filling and reclamation, a large amount of pollutants will be brought into the site, which will endanger human safety through the food chain. Since the reclaimed soil in the mining area is artificial soil, the composition of the soil profile includes topsoil, core soil, subsoil and filling material layers, etc., which is different from the normal soil profile. The content of toxic and harmful elements in normal soil below the surface soil is relatively small, but due to the particularity of its composition (composed of the aforementioned filling ...

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Problems solved by technology

Although chemical analysis methods and physical analysis methods can obtain instantaneous pollution information of monitored objects, destructive sampling is required, the monitoring range is limited, and it is time-consuming and labor-intensive; biological monitoring methods can monitor long-term ecological effects of polluted objects, but due to their own characteristics, the survey results must have high precision and accuracy, which is difficult to achieve in conventional experimental operations and does not have the characteristics of large-scale promotion

In addition, the existing methods for estimating soil toxic and harmful elements using field measured soil spectral data are often less accurate due to interference from field light, temperature, humidity, etc. In addition, the use of field portable spectrometers for soil hyperspectral data collection is only Limited to the surface soil (within 20cm), it is difficult to measure and calculate the toxic and harmful elements in different layers of the soil, and due to the large area of ​​the reclamation site in the mining area, it is not possible to sample multiple points on the reclamation site in the mining area by means of grid sampling. The information of the detected heavy metal content is displayed in the form of a distribution map, which is not convenient for people to use the mine reclamation site. Therefore, there is an urgent need for an effective and rapid detection of heavy metals in the soil and the location and location of heavy metals. The method of comprehensive display of content

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