Assessment of heavy metal contamination in the surrounding soils and surface sediments in Xiawangang River, Qingshuitang District

• Published in: PloS one 2013-08, Vol.8 (8), p.e71176
• Main Authors: Jiang, Min, Zeng, Guangming, Zhang, Chang, Ma, Xiaoying, Chen, Ming, Zhang, Jiachao, Lu, Lunhui, Yu, Qian, Hu, Langping, Liu, Lifeng
• Format: Article
• Language: English
• Subjects: Analysis; Biology; Cadmium; Carbonates; Chemistry; China; Clay; Contamination; Copper; Correlation; Correlation analysis; Earth Sciences; Ecological niches; Education; Engineering; Environmental Monitoring; Environmental pollution; Environmental quality; Environmental science; Fluvial sediments; Geologic Sediments - analysis; Hazardous materials; Hazardous substances; Heavy metals; Laboratories; Lead; Marine environment; Metal concentrations; Metals; Metals, Heavy - analysis; pH effects; Planning; Political aspects; Pollutants; Pollution; Pollution control; Pollution sources; Polyethylene; Polymethyl methacrylate; Principal components analysis; Regression analysis; Risk assessment; Rivers; Rivers - chemistry; Sediment pollution; Sediments; Sediments (Geology); Soil - chemistry; Soil analysis; Soil contamination; Soil Pollutants - analysis; Soils; Water Pollutants, Chemical - analysis; Water pollution; Zinc
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0071176

Xiawanggang River region is considered to be one of the most polluted areas in China due to its huge amount discharge of pollutants and accumulation for years. As it is one branch of Xiang River and the area downstream is Changsha city, the capital of Hunan Province, the ecological niche of Xiawangang River is very important. The pollution treatment in this area was emphasized in the Twelfth Five-Year Plan of Chinese government for Xiang River Water Environmental Pollution Control. In order to assess the heavy metal pollution and provide the base information in this region for The Twelfth Five-Year Plan, contents and fractions of four heavy metals (Cd, Cu, Pb and Zn) covering both sediments and soils were analyzed to study their contamination state. Three different indexes were applied to assess the pollution extent. The results showed this area was severely polluted by the four heavy metals, and the total concentrations exceeded the Chinese environmental quality standard for soil, grade III, especially for Cd. Moreover, Cd, rated as being in high risk, had a high mobility as its great contents of exchangeable and carbonates fractions in spite of its relative low content. Regression analysis revealed clay could well explain the regression equation for Cd, Cu and Zn while pH and sand could significantly interpret the regression equation for Pb. Moreover, there was a significant correlation between Non-residual fraction and I(geo) for all the four metals. Correlation analysis showed four metals maybe had similar pollution sources.