Abstract: Two bacterial short2term testing systems , the SOS Chromotest ( tester st rain PQ37) and Ames test (tester st rains TA98 , TA100) ware applied to organic ext ract s of source water f rom the Pearl River in southern mainland China. One of the eight samples inducedboth gene mutation and SOS reaction. Another induced only SOS reaction. There was no obvious correlation among the genotoxicity and the chemical data. The conformity of Biological test s and chemical test s was found , to some extend , when the chemical data were t reated by fussy synthetic evaluation. The result s showe the complementary of the biological test s and chemical analysis in revealing the degree of pollution and the potential hazard of the organic chemicals of the water , and the application of fussy synthetic evaluation could be a way to compare the result s of biological test s and chemical analysis.

Key words: Ames test, SOS Chromotest, Bacterial Genotoxicity, Source water, Chemical pollution, Fussy Synthetic Evaluation.