鄱阳湖流域天然劣质地下水中锰富集特征及其健康风险评估
Enrichment of Manganese in Natural Inferior Groundwater and Its Health Risk Assessment in Poyang Lake Basin
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摘要: 为对鄱阳湖流域的天然劣质地下水进行锰富集研究，对在该流域收集的243组地下水监测数据，应用水文地球化学方法和地理信息系统，分析了地下水中锰的分布特征及富集原理，并结合美国环境保护局(United States Environmental Protection Agency, US EPA)的非致癌健康风险评价模型进行了地下水中锰的健康风险评估。结果表明：(1)研究区地下水类型主要为HCO3-Ca型和Cl-Ca·Mg型；(2)约有38.2%的区域地下水中锰浓度为0.1~0.4 mg·L-1，34.7%的区域锰浓度>0.4 mg·L-1；高浓度锰在山地丘陵和平原区域均有分布，分别受到氧化还原环境控制；(3)鄱阳湖流域范围内高锰地下水分布较为广泛，但对所有成人和绝大部分儿童均不存在非致癌风险，绝大部分区域无需进行额外管控。该研究结果可为鄱阳湖流域的水源地选取和保护提供依据。Abstract: In order to discuss the enrichment of manganese in the natural inferior groundwater of the Poyang Lake Basin, 243 sets of local groundwater data were collected. The distribution characteristics and enrichment mechanisms of manganese in groundwater were studied by using the hydrogeochemical method and geographic information system (GIS). Moreover, the health risk of manganese in groundwater was assessed according to US EPA non-carcinogenic health risk assessment model. The results show that the groundwater type with elevated manganese is dominated by HCO3-Ca and Cl-Ca·Mg. Groundwater in about 38.2% of the region area presents a manganese concentration of 0.1~0.4 mg·L-1, and 34.7% of the regional manganese concentration is greater than 0.4 mg·L-1. Higher concentrations of manganese in groundwater are found widely in both mountainous and hilly areas and plains controlled by the redox conditions, but there is no non-carcinogenic risk for all adults and most children. Therefore, there is no additional control to be required in most areas. These results provide a basis for the selection and protection of water sources in the studied area.
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Key words:
- manganese /
- groundwater /
- enrichment /
- health risk assessment /
- Poyang Lake Basin
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