Abstract: Thirty individuals of red swamp crayfish (Procambarus clarkia) were collected from the ponds and rivers in Hefei City, Feixi County, and Feidong County of Anhui Province in May 2005, and the residual amounts of Cd, Pb and Cr in a total of 84 ectoskeleton, liver, and muscle samples were determined by atomic absorption spectrophotometry. The results showed that the average detection rates of Cr, Cd and Pb in the samples were 100%, 91.7% and 94.1%, and the average concentrations of these heavy metals were 4.03, 0.38 and 7.14 μg·g^-1, respectively. Among the three test tissues, no significant difference was observed in Cr enrichment, but the enrichment of Cd and Pb was significantly different. The average concentrations of Cr, Cd and Pb in ectoskeleton, liver, and muscle were 4.03, 0.12 and 12.31 μg·g^-1, 3.88, 1.04 and 9.12 μg·g^-1, and 4.16, 0.09 and 0.72 μg·g^-1, respectively. Among the three test sites, there existed significant differences in the enrichment of Cr in ectoskeleton and muscle, and of Cr, Cd and Pb in liver. The enrichment of test heavy metals had no notable correlation with the body mass of P. clarkia, and no significant difference was found in the enrichment of the heavy metals between female and male individuals.

Key words: Metribuzin, Puma, Alachlor, Chlorella vulgaris, Toxicity, Chlorophyll