期刊
CLEAN-SOIL AIR WATER
卷 39, 期 7, 页码 612-618出版社
WILEY
DOI: 10.1002/clen.201000255
关键词
Aquatic-terrestrial ecotone; Contamination index; Geoaccumulation index; Integrated contamination index; Toxic units
类别
资金
- National Basic Research Program of China [2006CB403301, 2010CB951102]
- National Natural Science Foundation [50879005, 40701003, U0833002]
- National Science and Technology Major Water Project [2009ZX07209-008-03]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0809]
- Program for New Century Excellent Talents in University [NECT-10-0235]
Surface soils were collected in the aquatic-terrestrial ecotone (ATE) of Yongnianwa wetland, downstream of Haihe River basin of North China in June of 2007. Samples were subjected to a total digestion technique before they were analyzed for total concentrations of Cr, Cu, Ni, Pb, and Zn to investigate their pollution levels in the ATE. The contamination index, integrated contamination index, geoaccumulation index, toxic units, and sum of toxic units were adopted to assess the heavy metal contamination levels and ecotoxicity, respectively. The results showed all the selected element concentrations in upland soils of the ecotone were relatively higher than those in the lowland soils. No Cr pollution was observed in all soil samples, but almost all samples were slightly polluted by Cu, Ni, Pb, and Zn except for Site 1. The contamination indexes and geoaccumulation indexes consistently presented no contamination for Site 1 and slight contamination for other sites. The Sigma TUs increased from lowland to upland, but the whole level of toxicity in this ecotone was relatively low.
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