Heavy metal contamination of urban soils and dusts in Guangzhou, South China
Heavy metal contamination of urban soils and dusts in Guangzhou, South China
复制标题
广州市城市土壤和灰尘重金属污染
DOI：
10.1007/s10661-012-2617-x
复制
发表时间：
2013-02-01
影响因子：
3
通讯作者：
Wu, Xiao-Lian
中科院分区：
文献类型：
--
作者：
Cai, Quan-Ying;Mo, Ce-Hui;Wu, Xiao-Lian
研究了广州市路边、居民区、公园、校园运动场和商业场所土壤和灰尘中重金属的含量。样品经HClO 4 + HF + HNO 3酸消解后，用电感耦合等离子体原子发射光谱法测定。城市灰尘中Cd、Cr、Cu、Ni、Pb和Zn的平均含量分别为4.22 ± 1.21、62.2 ± 27.1、116 ± 30、31.9 ± 12.6、72.6 ± 17.9和504 ± 191 mg/kg干重。城市土壤中的相应水平（分别为0.23 ± 0.19、22.4 ± 13.8、41.6 ± 29.4、11.1 ± 5.3、65.4 ± 40.2和277 ± 214 mg/kg干重）显着较低。城市土壤和灰尘中6种金属的综合污染指数分别为0.25 ~ 3.4和2.5 ~ 8.4，其中61%的城市土壤样品为中度至高度污染，所有灰尘样品均为高度污染。主成分分析与聚类分析结果吻合较好，但城市土壤重金属元素间的关联性和聚类模式存在明显差异。多元统计分析结果表明，Cr和Ni主要来源于自然，Cd、Cu、Pb和Zn主要来源于人为活动。
The heavy metal concentrations of soil and dust samples from roadside, residential areas, parks, campus sport grounds, and commercial sites were studied in Guangzhou, South China. Heavy metals in samples were determined by inductively coupled plasma atomic emission spectrophotometer following acidic digestion with HClO4+ HF + HNO3. High concentrations, especially of Cd, Pb, and Zn, were found with mean concentrations of Cd, Cr, Cu, Ni, Pb, and Zn in the urban dusts being 4.22 ± 1.21, 62.2 ± 27.1, 116 ± 30, 31.9 ± 12.6, 72.6 ± 17.9, and 504 ± 191 mg/kg dry weight, respectively. The respective levels in urban soils (0.23 ± 0.19, 22.4 ± 13.8, 41.6 ± 29.4, 11.1 ± 5.3, 65.4 ± 40.2, and 277 ± 214 mg/kg dry weight, respectively), were significantly lower. The integrated pollution index of six metals varied from 0.25 to 3.4 and from 2.5 to 8.4 in urban soils and dusts, respectively, with 61 % of urban soil samples being classified as moderately to highly polluted and all dust samples being classified as highly polluted. The statistical analysis results for the urban dust showed good agreement between principal component analysis and cluster analysis, but distinctly different elemental associations and clustering patterns were observed among heavy metals in the urban soils. The results of multivariate statistic analysis indicated that Cr and Ni concentrations were mainly of natural origin, while Cd, Cu, Pb, and Zn were derived from anthropogenic activities.