College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China.
Chemosphere. 2020 Aug;252:126591. doi: 10.1016/j.chemosphere.2020.126591. Epub 2020 Mar 24.
The accumulation of heavy metals (HMs) in the soil poses a threat to human health. In this study, 62 pairs of topsoil and wheat grain samples were collected from a typical industrial park in northwest China, and the human health risks associated with cadmium (Cd), chromium (Cr), copper (Cu), mercury (Hg), nickel (Ni), lead (Pb) and zinc (Zn) were assessed through multiple exposure pathways. Meanwhile, the contribution of different environmental factors and their interactions were explored by using geo-detector. Results showed that Cd concentration in the soil ranged from 0.307 to 2.491 mg kg, with a median value of 0.588 mg kg, and almost half of the samples exceeded the pollution threshold. In comparison, other elements in the soil were below their mandatory thresholds. However, it is noteworthy that in addition to the median Cd concentration in wheat grains of 0.062 mg kg (0.018-0.246 mg kg), the Pb concentration also reached 0.2 mg kg (0.1-0.7 mg kg), with a sample over-standard rate of 48.39%. In addition, the health risk assessment results showed that the average total hazard index (HI) for adults and children was 1.22 and 1.53, and the total carcinogenic risk (TCR) was 7.0 × 10 and 2.32 × 10, respectively, both above acceptable criteria. Dietary intake was the main route of exposure. Among various factors, distance from industrial enterprises, altitude, and soil pH, distance from major roads were the most influential contributors. Their interactions were more prominent than the effects of single factors and this synergy deserves attention.
土壤中重金属（HMs）的积累对人类健康构成威胁。本研究在中国西北部一个典型的工业园区采集了 62 对表层土壤和小麦籽粒样本，通过多种暴露途径评估了与镉（Cd）、铬（Cr）、铜（Cu）、汞（Hg）、镍（Ni）、铅（Pb）和锌（Zn）相关的人体健康风险。同时，利用地理探测器探索了不同环境因素及其相互作用的贡献。结果表明，土壤中 Cd 浓度范围为 0.307-2.491mg/kg，中位数为 0.588mg/kg，近一半的样本超过了污染阈值。相比之下，土壤中其他元素均低于其强制性阈值。然而，值得注意的是，除了小麦籽粒中 Cd 浓度的中位数为 0.062mg/kg（0.018-0.246mg/kg）外，Pb 浓度也达到 0.2mg/kg（0.1-0.7mg/kg），超标率为 48.39%。此外，健康风险评估结果表明，成人和儿童的平均总危害指数（HI）分别为 1.22 和 1.53，总致癌风险（TCR）分别为 7.0×10 和 2.32×10，均超过可接受标准。饮食摄入是主要暴露途径。在各种因素中，距工业企业的距离、海拔、土壤 pH 值和距主要道路的距离是最具影响力的因素。它们的相互作用比单一因素的影响更为显著，这种协同作用值得关注。
