Details

Autor(en) / Beteiligte

• Li, Ru-Zhong
• Jiang, Yan-Min
• Pan, Cheng-Rong
• Chen, Jing
• Xu, Jing-Jing

Titel

Fraction distribution and risk assessment of heavy metals in stream sediments from a typical nonferrous metals mining city

Ist Teil von

• Huanjing kexue, 2013-03, Vol.34 (3), p.1067

Ort / Verlag

China

Erscheinungsjahr

2013

Quelle

MEDLINE

Beschreibungen/Notizen

• A modified Tessier's sequential extraction procedure was used to investigate the fraction of seven types of heavy metals (Cd, Cr, Cu, Zn, Ni, Pb, As) in the surface sediments from Huixi Stream in Tongling City, a typical nonferrous metals mining city, China. Based on speciation distribution analysis of these metals, contamination degree and ecological risk assessment of heavy metals were conducted by means of risk assessment code (RAC) and mean sediment quality guideline quotient (SQG-Q). The results show that: (1) Cr and As are major composed with residual fractions, Zn, Ni and Pb are mainly constituted of residual and bound to iron and manganese oxides fractions, and Cu is dominated by bounding to organic matter, while Cd exists in approximate mass fractions of exchangeable, bound to carbonates, bound to iron and manganese oxides, and residue. (2) Carbonate and exchangeable mass fractions of Cd, Cr, Cu, Zn, Ni, Pb and As reach 46.48%, 4.62%, 4.05%, 4.12%, 9.17%, 0.97% and 0.03%, respectively. According to t