Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry Education, Chang'an University, Xi'an 710054, China.
School of Water and Environment, Chang'an University, Xi'an 710054, China.
Int J Environ Res Public Health. 2022 Nov 14;19(22):14962. doi: 10.3390/ijerph192214962.
To provide scientific basis for the prevention and control of heavy metal pollution, a field investigation, sample collection and analysis of the heavy metal content in farmland soils at the northern foot of the Qinling Mountains were conducted. Based on the comparative analysis of the single pollution index method, the Nemerow comprehensive pollution index method, the geological accumulation index method, the potential ecological hazard index method, and the geological accumulation index method were used to comprehensively analyze and evaluate the risk of soil heavy metal pollution. The results showed that the heavy metal pollution of farmland soil at the northern foot of the Qinling Mountains was severe, among which Hg and Cr pollution was relatively obvious. Taking the soil screening values of agricultural land as the standard, the quantity of element Hg in agricultural soils at the northern foot of the Qinling Mountains was higher than the relevant screening value. In the two sample sites investigated, the intensity of the heavy metal accumulation index in Baoqizhai Village was Hg > Cr > Cu > As > Pb, and in Dayangyu Village it was Cr > Cu > As > Pb. Among them, in Baoqizhai Village it shows the heavy pollution caused by Hg (Igeo= 3.42) and the light pollution caused by Cr (Igeo < 1) in the two areas. Hg is mostly affected by mining activities and its atmospheric subsidence. At the same time, Cr is mainly derived from the weathering of rock parent material and is also affected by anthropogenic factors to a certain extent. The accumulation of heavy metals in the farmland soil around the northern foot of the Qinling Mountains was relatively high, posing a threat to the surrounding soil environment. Therefore, it is urgent to control farmland soil environmental pollution.
为了给重金属污染的防治提供科学依据，对秦岭北麓农田土壤重金属含量进行了野外调查、采样和分析。基于单因子污染指数法、内梅罗综合污染指数法、地质累积指数法、潜在生态危害指数法和地质累积指数法的对比分析，对土壤重金属污染的风险进行了综合分析和评价。结果表明，秦岭北麓农田土壤重金属污染严重，其中 Hg 和 Cr 污染较为明显。以农用地土壤筛选值为标准，秦岭北麓农用地土壤中元素 Hg 的含量高于相关筛选值。在所调查的两个采样点中，保旗寨村的重金属积累指数强度为 Hg > Cr > Cu > As > Pb，大阳峪村为 Cr > Cu > As > Pb。其中，保旗寨村 Hg 表现为重污染（Igeo=3.42），Cr 表现为轻污染（Igeo<1）。Hg 主要受采矿活动及其大气沉降的影响，Cr 主要来源于岩石母质的风化，同时也受到一定程度的人为因素影响。秦岭北麓周边农田土壤重金属积累较高，对周边土壤环境构成威胁。因此，急需控制农田土壤环境污染。
