State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Int J Environ Res Public Health. 2019 Nov 16;16(22):4539. doi: 10.3390/ijerph16224539.
Simultaneous ecological and health risk assessments of potentially toxic elements in soils and sediments can provide substantial information on their environmental influence at the river-basin scale. Herein, soil and sediment samples were collected from the Guishui River basin to evaluate the pollution situation and the ecological and health risk of potentially toxic elements. Various indexes were utilized for quantitatively assessing their health risks. Pollution assessment by geo-accumulation index showed that Cd had "uncontaminated to moderately polluted" status in the soils and sediments. Potential ecological risk index showed that the Guishui River basin was at low risk in general, but Cd was classified as "moderate or considerable ecological risk" both in the soils and sediments. Health risk assessment calculated human exposure from soils and indicated that both non-carcinogenic and carcinogenic risks of the selected potentially toxic elements were lower than the acceptable levels. Health risks posed by potentially toxic elements bio-accumulated in fish, stemming from sediment resuspension, were also assessed. Non-carcinogenic hazard index indicated no adverse health effects on humans via exposure to sediments; however, in general, Cr contributed largely to health risks among the selected potentially toxic elements. Therefore, special attention needs to be paid to the Guishui River basin in the future.
同时进行土壤和沉积物中潜在有毒元素的生态和健康风险评估，可以提供有关其在河流流域范围内环境影响的大量信息。本研究采集了贵水河流域的土壤和沉积物样品，以评估潜在有毒元素的污染状况和生态与健康风险。利用各种指标对其健康风险进行定量评估。通过地积累指数进行污染评估表明，土壤和沉积物中的 Cd 处于“无污染到中度污染”状态。潜在生态风险指数显示，贵水河流域总体上处于低风险，但 Cd 在土壤和沉积物中均被归类为“中度或相当大的生态风险”。从土壤中计算出的人体暴露评估表明，所选潜在有毒元素的非致癌和致癌风险均低于可接受水平。还评估了因沉积物再悬浮而导致生物累积在鱼类中的潜在有毒元素对健康造成的风险。非致癌危害指数表明，通过接触沉积物，人类不会受到不良健康影响；然而，在所选潜在有毒元素中，Cr 通常会导致很大的健康风险。因此，未来需要特别关注贵水河流域。
