State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China.
Binhai College, Nankai University, Tianjin 300000, China.
Int J Environ Res Public Health. 2022 Oct 15;19(20):13324. doi: 10.3390/ijerph192013324.
In this study, the concentrations of potentially toxic elements in 283 topsoil samples were determined. Håkanson toxicity response coefficient modified matter element extension model was introduced to evaluate the soil elements contamination, and the results were compared with the pollution index method. The sources and spatial distribution of soil elements were analyzed by the combination of the PMF model and IDW interpolation. The results are as follows, 1: The concentration distribution of potentially toxic elements is different in space. Higher concentrations were found in the vicinity of the mining area and farmland. 2: The weight of all elements has changed significantly. The evaluation result of the matter-element extension model shows that 68.55% of the topsoil in the study area is clean soil, and Hg is the main contamination element. The evaluation result is roughly the same as that of the pollution index method, indicating that the evaluation result of the matter-element extension model with modified is accurate and reasonable. 3: Potentially toxic elements mainly come from the mixed sources of atmospheric sedimentation and agricultural activities (22.59%), the mixed sources of agricultural activities and mining (20.26%), the mixed sources of traffic activities, nature and mining (36.30%), the mixed sources of pesticide use and soil parent material (20.85%).
本研究测定了 283 个表层土壤样品中潜在有毒元素的浓度。采用修正的哈肯森毒性响应系数物元拓展模型评价土壤元素污染，并与污染指数法进行比较。采用 PMF 模型和 IDW 插值相结合的方法分析土壤元素的来源和空间分布。结果如下：1. 潜在有毒元素的浓度分布在空间上存在差异，矿区和农田附近的浓度较高。2. 所有元素的权重都发生了显著变化。物元拓展模型的评价结果表明，研究区 68.55%的表层土壤为清洁土壤，Hg 是主要污染元素。评价结果与污染指数法大致相同，表明修正后的物元拓展模型评价结果准确合理。3. 潜在有毒元素主要来源于大气沉降和农业活动的混合源（22.59%）、农业活动和采矿的混合源（20.26%）、交通活动、自然和采矿的混合源（36.30%）、农药使用和土壤母质的混合源（20.85%）。
