Abstract
Surface soils (0–20 cm) were collected from along a tidal ditch of the Yellow River Estuary in August of 2007. Samples were subjected to a total digestion technique before they were analyzed for total concentrations of As, Cr, Cd, Cu, Ni, Pb, Zn, P and S in order to investigate heavy metal contamination levels in wetland soils nearby the tidal ditches and their main sources. Results showed that the mean concentrations of these heavy metals except for As and Cd were lower than the Class I criteria. Nearly all sampling sites showed lower contamination levels for As and Cd, while no contamination levels for other heavy metals. Cr, Cu, and Ni mainly originated from parent rocks, and Pb and As might originate from tidal seawater and oil field pollution, respectively; while Cd and Zn mainly originated from parent rocks and tidal seawater. Most of heavy metals showed significant correlations with total concentrations of P and S, however, no significant correlations were observed between them and soil pH, slat and soil organic matter.
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Acknowledgments
This work was financially supported by National Basic Research Program (Grant no. 2010CB951102), National Natural Science Foundation of China (Grant no. 50879005 and U0833002), Program for New Century Excellent Talents in University, Program for Changjiang Scholars and Innovative Research Team in University (Grant no. IRT0809) and the Fundamental Research Funds for the Central Universities (no. 2009SD-24).
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Bai, J., Huang, L., Yan, D. et al. Contamination characteristics of heavy metals in wetland soils along a tidal ditch of the Yellow River Estuary, China. Stoch Environ Res Risk Assess 25, 671–676 (2011). https://doi.org/10.1007/s00477-011-0475-7
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DOI: https://doi.org/10.1007/s00477-011-0475-7