genotoxic risk identification of soil contamination at a major industrialized city in northeast china by a combination of in vitro and in vivo bioassays.the present study evaluated the genotoxicity of field soils in the tianjin area, one of the most industrialized contaminated areas in northeast china. the genotoxicity of organic extracts of 41 soils was assayed by an in vitro sos/ umu bioassay with salmonella typhimurium ta 1535/psk 1002. from the 41 soil samples, 11 samples were selected to confirm the genotoxic effect by in vivo single-cell gel electrophoresis (comet assay) using earthworms (eisenia fetida). the results obtained demonstrated ...200617051817
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