Lead in grain size fractions of road-deposited sediment
Lead in grain size fractions of road-deposited sediment
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DOI：
10.1016/s0269-7491(02)00219-1
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发表时间：
2003-01-01
影响因子：
8.9
通讯作者：
Sutherland, RA
中科院分区：
文献类型：
--
作者：
Sutherland, RA
道路沉积物（RDS）是评价城市系统污染水平的重要环境介质。它们在大气中的再悬浮对人类健康有重大影响，暴雨水的输送可直接影响水生生物群。从20个RDS样品的数据从Palolo谷，奥克拉荷马州，夏威夷，被分成6个粒度级和分析铅使用弱盐酸（0.5 M）消化。数据表明，在所有样品中的显着铅污染。中位不稳定铅浓度（n = 120）为170毫克/公斤，范围从4到1750毫克/公斤。五个沉积物组分< 1000微米有统计学上相似的铅浓度，但都显着大于粗粒级检查（1000-2000妈妈）。粉土加粘土（< 63 pm）是最重要的单一质量组分，占总沉积物的38%。< 63 Vm的沉积物质量与222 mg/kg的中位不稳定Pb浓度相结合，占道路沉积物中总Pb负荷的51%。这些研究结果是显着的，从环境管理的角度来看，这些问题进行了讨论，街道清扫机沉积物粒度去除效率。(C)2002爱思唯尔科技有限公司版权所有。
Road-deposited sediment (RDS) is an important environmental medium for assessing contaminant levels in urban systems. Their atmospheric resuspension has significant implications for human health, and storm water transport can directly impact aquatic biota. Data from 20 RDS samples from Palolo Valley, Oahu, Hawaii, were fractionated into six grain-size classes and analyzed for Pb using a weak HCl (0.5 M) digestion. Data indicate significant Pb contamination in all samples. Median labile Pb concentration (n = 120) was 170 mg/kg, with a range from 4 to 1750 mg/kg. The five sediment fractions < 1000 pm had statistically similar Pb concentrations, but all were significantly greater than the coarsest fraction examined (1000-2000 mum). Silt plus clay ( < 63 pm) was the single most important mass component with 38% of the total sediment stored in this fraction. Mass of sediment < 63 Vm combined with a median labile Pb concentration of 222 mg/kg accounted for 51% of the total Pb load stored in road sediments. These findings are significant from an environmental management perspective, and these issues are discussed in light of street sweeper sediment grain size removal efficiencies. (C) 2002 Elsevier Science Ltd. All rights reserved.