The Heavy Metal Pollution Assessment of Topsoil in the North Bank of the Yellow River in Shandong Based on Granulation

Abstract

With the rapid development of the economy, environmental pollution is becoming more and more serious. As one of the important carriers of industry and agriculture, the soil is one of the key concerns of people. The research on soil heavy metal pollution is also progressing day by day, and there are abundant research results. However, there are few studies on soil heavy metal pollution based on a granular level, most of which are whole-rock samples. Therefore, we evaluated the soil heavy metal pollution in the north bank of the Yellow River in Shandong province from the perspective of grain size. We hope to fill that gap. In this study, we systematically sampled topsoil from 15 sites on the north bank of the Yellow River in Shandong province. It was divided into two components, <20μm and 20-63μm, with a total of 32 data. The contents of heavy metals in soil were determined by ICP-MS. Based on experimental data, the single factor method and comprehensive index method were used to evaluate heavy metal pollution. The results showed that heavy metal pollution conditions were related to soil particle thickness. The contents of heavy metals in fine soil <20μm were higher. Among them, the heavy metal Ni content in 15 points exceeded the safety line, and 2 areas were slightly polluted. The composite index of 16 samples exceeded the safety line, and four sites had minor contamination. The heavy metal content of the soil with 20~63μm, thick particles was generally low, and the pollution evaluation result was clean. The results verified the geochemical characteristics of heavy metals enrichment in fine soil. In addition, the potential ecological hazards of heavy metals in soil particles < 20μm and 20-63μm were evaluated. The results showed slight ecological damage, which may be related to the biological toxicity of heavy metals.