Heavy metal contents of road-deposited sediment along the urban-rural gradient around Beijing and its potential contribution to runoff pollution.
Heavy metal contents of road-deposited sediment along the urban-rural gradient around Beijing and its potential contribution to runoff pollution.
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DOI：
10.1021/es2003233
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发表时间：
2011-09
影响因子：
11.4
通讯作者：
Hongtao Zhao;Xuyong Li;Xiaomei Wang
中科院分区：
文献类型：
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作者：
Hongtao Zhao;Xuyong Li;Xiaomei Wang
了解道路沉积物及其冲刷过程对城市径流污染的贡献对控制城市径流污染具有重要意义。在北京都市圈中心城区、城中村、中心城郊县、乡镇和乡村5个行政区，沿城市-郊区梯度采集了97份RDS样本。利用降雨模拟器对不同粒径的RDS洗差进行了评价。对RDS和径流样品中的重金属元素（即Cr、Cu、Ni、Pb和Zn）进行了估算。单位面积RDS质量的增大顺序为：UCA(21±24 g/m(2))≈CSA(20±16 g/m(2)) < RTA(59±63 g/m(2)) < RVA(147±112 g/m(2))≈UVA（147±198 g/m(2)）。与来自其他行政单位的RDS相比，来自UCA和CSA的RDS具有更高的金属浓度和更高的小颗粒比例，而来自RVA和UVA的RDS每单位面积的金属含量更高。UCA和CSA的单位面积潜在径流污染贡献较小。我们的研究结果表明，控制东部地区和东部地区的首次冲水，改善东部地区、东部地区和东部地区现有的街道清洁方法和路面状况，将是控制东部地区径流污染的适当策略。
Understanding the contribution of road-deposited sediment (RDS) and its washoff process is essential for controlling urban runoff pollution. Ninety-seven RDS samples were collected along the urban-suburban-rural gradient from areas of five administrative units in the Beijing metropolitan region, including central urban (UCA), urban village (UVA), central suburban county (CSA), rural town (RTA), and rural village (RVA) areas. RDS washoff was evaluated with different particle sizes using a rainfall simulator. Heavy metal elements (i.e., Cr, Cu, Ni, Pb, and Zn) were estimated in both RDS and runoff samples. The RDS mass per unit area increased in the order UCA (21 ± 24 g/m(2)) ≈ CSA (20 ± 16 g/m(2)) < RTA (59 ± 63 g/m(2)) < RVA (147 ± 112 g/m(2)) ≈ UVA (147 ± 198 g/m(2)). Compared to RDS from the other administrative units, RDS from the UCA and CSA had higher metal concentrations and higher proportions of smaller particles, whereas that from the RVA and UVA had larger quantities of metals per unit area. UCA and CSA had lower potential runoff pollution contributions per unit area. Our findings imply that controlling the first flush in the UCA and CSA, and improving existing street cleaning methods and road surface conditions in the TRA, UVA, and RVA will be appropriate strategies for controlling runoff pollution from RDS.