Chinese Research Academy of Environmental Sciences, Agricultural Environmental Research Center, Beijing 100012, China.
Chinese Research Academy of Environmental Sciences, State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012, China.
Int J Environ Res Public Health. 2018 Oct 25;15(11):2364. doi: 10.3390/ijerph15112364.
This study focused on the Chao River and Baimaguan River located upstream of the Miyun Reservoir in Miyun District (Beijing, China). Soil and sediment samples were collected from the river and drainage basin. Total nitrogen, total phosphorus, and six potentially toxic elements including cadmium, zinc, lead, chromium, arsenic, and copper, were analyzed in terms of concentration, potential ecological risk, and human health risk. The average concentrations of the six potentially toxic elements were all below the soil environmental quality standards for China. Cadmium was the most serious pollutant in both soils and sediments, at 2.58 and 3.40 times its background values. The contents of Cd and Pb were very closely related ( < 0.01) to total nitrogen concentrations in both soil and sediment samples. The potential ecological risks posed by Cd in the Chao and Baimaguan River soils were considerable and moderate, respectively. The historical iron ore mining and agricultural activity were identified as the primary sources of potentially toxic element pollution of soil and sediment in the Chao-Bai River in Miyun District. Human health risk assessment indicated that non-carcinogenic risks all fell below threshold values. The total carcinogenic risks due to Cr and As were within the acceptable range for both adults and children. This conclusion provides a scientific basis for the control of potentially toxic element pollution and environmental protection of the Miyun Reservoir in Beijing.
本研究聚焦于北京市密云区密云水库上游的潮河和白河干支流。采集了河道和流域的土壤和沉积物样本，分析了总氮、总磷以及镉、锌、铅、铬、砷和铜这六种潜在有毒元素的浓度、潜在生态风险和人体健康风险。六种潜在有毒元素的平均浓度均低于中国土壤环境质量标准。镉是土壤和沉积物中最严重的污染物，其含量分别是背景值的 2.58 倍和 3.40 倍。土壤和沉积物中 Cd 和 Pb 的含量与总氮浓度呈极显著正相关（<0.01）。潮河和白河土壤中 Cd 的潜在生态风险分别为高和中。历史上的铁矿开采和农业活动被认为是密云区潮白河土壤和沉积物中潜在有毒元素污染的主要来源。人体健康风险评估表明，非致癌风险均低于阈值。成人和儿童的 Cr 和 As 的总致癌风险均在可接受范围内。该结论为北京密云水库潜在有毒元素污染控制和环境保护提供了科学依据。
