![]() The soil samples were digested by an electric heating plate. ![]() Finally, the samples were numbered, sealed, dried, and stored for standby. Then the samples were ground and passed through a 200 mesh sieve, 20 mesh sieve, and 10 mesh sieve. The collected soil samples were placed in the room for natural air drying, the wooden rod was then used to break the larger soil block, and the sundries, such as gravel and dead branches, in the samples were removed manually. During the sampling process, the longitude and latitude of soil samples were recorded with a GPS positioning instrument, and the type, texture, and surrounding environment of the farmland soil for each sample were observed and recorded on the sampling registration form. Soil samples were mainly farmland soil, which were collected and sealed in plastic bags. Taking into account the basic conditions of the study area, such as the monsoon wind direction, river trends, and geological characteristics, sampling points were arranged every 200 m in the east, west, and north directions. This paper analyzes the problem of complex geological SHMP from both theoretical and practical aspects, and introduces the Nemerow index method to ensure that the evaluation factors obtain reasonable scores, effectively correct the problems existing in the original method, and provide reference for the investigation of complex geological SHMP. Therefore, this paper puts forward a modeling method of complex geological soil heavy metal evaluation based on the Nemerow index method. At the same time, the pollution grade of soil environment quality can be determined according to the calculated Nemero pollution index. The Nemerow pollution index method can comprehensively evaluate the environmental quality of soil, not only reflecting the impact of various pollutants on the soil environment but also highlighting the role of high-concentration pollutants. The research results showed that this method could make the evaluation factors obtain reasonable scores and obtain more reasonable soil evaluation results.Īlthough the traditional method has been extensively applied in the evaluation of soil heavy metals, its evaluation results have the following limitations: the individual index scores are not continuous and there is a sudden change in soil quality. On this basis, the Nemerow index method was used to establish a complex geological soil heavy metal evaluation model, and the standard Nemerow index was calculated to complete the evaluation of heavy metal pollution in complex geological soils. The comprehensive pollution index (CPI) method, geo-accumulation index (GAI) method, and potential ecological hazard (PEH) index were adopted to analyze the pollution degree of soil heavy metals. ![]() Index evaluation methods, ArcGIS technology, and a human health risk assessment were carried out to obtain the spatial distribution of heavy metals in the soil and the current status of pollution accumulation. ![]() To accurately understand soil environmental quality and improve the problem of the traditional method, which is that it has a single evaluation factor and cannot reflect the overall condition of the soil, a complex geological soil heavy metal evaluation modeling method based on the Nemerow index method is proposed. ![]()
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