A statistical approach for determini

A statistical approach for determining the envi-ronment impact of surface sediments from the Dongting Lake area, central

The Dongting Lake, the second biggest freshwater lake in China, consists of three wetlands of national importance, namely the East Dongting Lake, the South Dongting Lake, and the West Dongting Lake. Surface sedi-ments were sampled from 57 locations across the lake. Nutrient concentrations [total organic carbon (TOC), total N (TN) and total P (TP)] and 16 element concentrations (Al, As, B, Ca, Cd, Cr, Cu, K, Fe, Hg, Mn, Ni, Pb, Si, Ti and Zn) in the sediments were measured to investigate the impact of industrialization along the lake's coastline and sev-eral tributaries on the profiles of nutrients and heavy metals in the lake's surface sediments. R-mode cluster analysis (CA) was used to integrate geochemical data. The result showed that euthophication of the Dongting Lake resulted mainly from TN and TOC. The main polluting trace metals are Hg, As, Cd, Zn, Pb and Mn, which are largely ad-sorbed on clay minerals or Fe/Mn oxides, or deposited as carbonates. Principal component analysis (PCA) revealed the source of micropollutants. The worst affected district by heavy metals is the East Dongting Lake, the pollution sources may originate mainly from the Xiangjiang drainage area. The results demonstrated that multivariate methods are the potentially great tools for the interpretation of the environmental data on lake sediments.

作 者： YAO Zhigang BAO Zhengyu ZHOU Lifa GAO Pu   作者單位： YAO Zhigang(Key Laboratory of Continental Dynamics, Ministry of Education/Department of Geology, Northwest University, Xi'an 710069, China;School of Petroleum Resources, Xi'an Shiyou University, Xi'an 710065, China)

BAO Zhengyu(State Key Laboratory of Geological Processes and Mineral Resources, China University ofGeosciences, Wuhan 430074, China)

ZHOU Lifa(Key Laboratory of Continental Dynamics, Ministry of Education/Department of Geology, Northwest University, Xi'an 710069, China)

GAO Pu(School of Petroleum Resources, Xi'an Shiyou University, Xi'an 710065, China) 

刊 名： 中國地球化學學報（英文版）  英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY  年，卷(期)： 2009 28(1)  分類號： P59  關鍵詞： Dongting Lake   sediment   heavy metal   nutrient   multivariate analysis  

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