Status and fuzzy comprehensive assessment of combined heavy metal and organo-chlorine pesticide pollution in the Taihu Lake region of China.

The status of combined heavy metal and organo-chlorine pesticide (OCPs; i.e. HCH and DDT) pollution was investigated and the soil environmental quality of the Taihu Lake watershed, one of the most developed regions in China, was evaluated using a fuzzy comprehensive assessment. Statistical analyses showed the presence of combined pollution in the soil. At many sampling sites, heavy metal concentrations were above corresponding background values, indicating the effects of extraneous pollutants. It has been over 20 years since China banned the use of OCPs, but they can still be found in soil samples of this region. HCH levels at all investigated sites were below the Chinese Environmental Quality Standard for Soils. Fuzzy comprehensive assessment showed that the overall soil quality in this region could be categorized as class I. Nevertheless, the high coefficients of variation for levels of DDT, Cd and Hg indicated the existence of some point-source pollution. Continuous monitoring and further studies of the region are recommended to prevent pollution of farmland from these sources.

[1]  R. C. Bigelow,et al.  Distribution of a suite of elements including arsenic and mercury in Alabama coal , 2000 .

[2]  V. Novák.  Fuzzy sets and their applications , 1989 .

[3]  G. Önkal-Engin,et al.  Assessment of urban air quality in Istanbul using fuzzy synthetic evaluation , 2004 .

[4]  M. Wong,et al.  Status of trace elements in paddy soil and sediment in Taihu Lake region. , 2003, Chemosphere.

[5]  X C Wang,et al.  Organo-chlorine pesticide (DDT and HCH) residues in the Taihu Lake Region and its movement in soil-water system I. Field survey of DDT and HCH residues in ecosystem of the region. , 2003, Chemosphere.

[6]  A. Badawy,et al.  Distribution of organochlorine pesticides in the Egyptian aquatic ecosystem , 1995 .

[7]  Ronald R. Yager,et al.  Multiple objective decision-making using fuzzy sets , 1977 .

[8]  B. Fisher.  Fuzzy environmental decision-making: applications to air pollution , 2003 .

[9]  Wang Haiyan,et al.  Assessment and prediction of overall environmental quality of Zhuzhou City, Hunan Province, China. , 2002, Journal of environmental management.

[10]  M. Goldhaber,et al.  Modes of occurrence of mercury and other trace elements in coals from the warrior field, Black Warrior Basin, Northwestern Alabama , 2004 .

[11]  J. Groten,et al.  Toxicological evaluation of chemical mixtures. , 2002, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[12]  B. Wilke,et al.  Combination effects of heavy metals and fluoranthene on soil bacteria , 1997, Biology and Fertility of Soils.

[13]  Z. Cao,et al.  Copper contamination in paddy soils irrigated with wastewater. , 2000, Chemosphere.