摘要
For the first time in P. R. China, six locations were investigated regarding the impact of poloychlorinated dibenzo-p-dioxins (PCDs) and polychlorinated dibenzofurans (PCDFs) in contaminated sediments and soils in the Ya-Er Lake area . Total concentrations of PCDDs from 70 to 1.6 ×105 ng/kg dw ,median 7.9×104 ng/kg dw and of PCDFs from 1.8 to 1.8 ×104ng/kg dw ,median 9.2 ×103 ng/kg dw were measured . The internaional toxic equivalents (I-TEQ) varied from 0.14 to 8.1×10 2 ng/kg dw,median 4.1×102 ng/kg dw The PCDDs pattern showed that the concentration of OCDD was significantly higher than that of the low chlorinated congeners . The results indicated that parts of Ya-Er Lake are heavily pollutad by there chiorinated compounds. Comparison of our results with the pattern of sediments showed significant differences . The asults are of special importance bocause the pollution that affected Ya-Er Lake may spread to agricultural land and the Changjiang River.
For the first time in P. R. China, six locations were investigated regarding the impact of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in contaminated sediments and soils in the Ya-Er Lake area. Total concentrations of PCDDs from 70 to 1.6×105 ng/kg dw, median 7.9×104 ng/kg dw and of PCDFs from 1.8 to 1.8×104 ng/kg dw, median 9.2×103 ng/kg dw were measured. The international toxic equivalents (I-TEQ) varied from 0.14 to 8.1×102 ng/kg dw, median 4.1×102 ng/kg dw. The PCDDs pattern showed that the concentration of OCDD was significantly higher than that of the low chlorinated congeners. The results indicated that parts of Ya-Er Lake are heavily polluted by these chlorinated compounds.
Comparison of our results with the pattern of sediments showed significant differences. The results are of special importance because the pollution that affected Ya-Er Lake may spread to agricultural land and the Changjiang River.
