Pollution Characteristics and Risk Assessment of Heavy Metals in Dujiangyan Irrigation District, China

IF 2.6 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Yang Qiao, Hongling Yin, Shuyu Lin, Xiaoke Guo, Hui Zhang, Geng Ge, Yuxiang Lu
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引用次数: 0

Abstract

Dujiangyan Irrigation District is the largest irrigation district in China. To understand heavy metal pollution and its potential hazards, the contents and distribution of typical heavy metals in rivers, soils and plant samples from 19 sites were studied and their ecological risks and health risks were evaluated. The results showed that the concentrations of nine heavy metals in the river water did not exceed the safe values (GB 3838-2002). They showed a trend of the highest in the middle reaches followed by the upstream and downstream areas, and the concentration in the dry season (winter) was higher than that in the wet season (summer). The average values of heavy metals in the soil were 0.3–3.08 times the background values in Chengdu. The highest average enrichment factor was Cd (7.52). The Nemerow pollution index indicated that the quality of the river water was at a clean level. However, the heavy metals in the soil at sites B1 and B3 were at a heavy pollution level. The potential ecological hazard index also showed that Cd in the soils of the study area at sites B1 and B3 was very highly hazardous and 26% of the sample area was at a highly hazardous level. The cumulative carcinogenic health risks due to total heavy metals exceeded the safety limits for both children and adults. Furthermore, the risks were higher in children than in adults. This study provides theoretical support for dealing with heavy metal pollution in the irrigation district.

Abstract Image

中国都江堰灌区重金属污染特征与风险评估
都江堰灌区是中国最大的灌区。为了了解重金属污染及其潜在危害,研究了 19 个地点的河流、土壤和植物样品中典型重金属的含量和分布,并对其生态风险和健康风险进行了评估。结果表明,河水中 9 种重金属的浓度均未超过安全值(GB 3838-2002)。重金属浓度呈中游最高、上下游次之的趋势,旱季(冬季)浓度高于雨季(夏季)。土壤中重金属的平均值是成都背景值的 0.3-3.08 倍。平均富集因子最高的是镉(7.52)。尼莫洛污染指数表明河水水质处于清洁水平。但是,B1 和 B3 地块土壤中的重金属处于重度污染水平。潜在生态危害指数也显示,研究区域 B1 和 B3 地块土壤中的镉含量处于极高危害水平,26% 的样本区域处于高危害水平。总重金属的累积致癌健康风险超过了儿童和成人的安全限值。此外,儿童的风险高于成人。这项研究为解决灌区重金属污染问题提供了理论支持。
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来源期刊
CiteScore
5.40
自引率
0.00%
发文量
104
审稿时长
1.7 months
期刊介绍: International Journal of Environmental Research is a multidisciplinary journal concerned with all aspects of environment. In pursuit of these, environmentalist disciplines are invited to contribute their knowledge and experience. International Journal of Environmental Research publishes original research papers, research notes and reviews across the broad field of environment. These include but are not limited to environmental science, environmental engineering, environmental management and planning and environmental design, urban and regional landscape design and natural disaster management. Thus high quality research papers or reviews dealing with any aspect of environment are welcomed. Papers may be theoretical, interpretative or experimental.
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