| Summary: | 碩士 === 朝陽科技大學 === 環境工程與管理系 === 102 === We used Microtox test of bacferia (Vibrio fischeri) and hydrostatic test of Cyprinus carpio to dctermine the toxicity of single heavy metal, and binary heavy metal. We also study co-toxicity coefficient of mixed metal from these two methods. The toxic rank based on the EC50 was, in the descending order, Hg > Cu > Zn > Pb > Cd > Ni > Cr by microtox method. The highest toxicity of heavy metal was Hg with EC50 at 0.13 mg/L; The lowest toxicity of heavy metal was Cr with EC50 at 59.33 mg/L. The toxic rank based on the LC50 was in the descending order, Cd > Hg > Cu > Zn > Ni > Pb > Cr by Cyprinus carpio test. The highest toxicity of heavy metal was Cd with LC50 at 0.13 mg/L; The lowest toxicity of heavy metal was Cr with LC50 at 12.31 mg/L. The toxicity of effluent of electroplating factory A showed the highest toxic effect with EC50 at 7.57 mg/L by microtox method. The cotoxicity coefficient of effluentt of electroplating factory A is 9.31 by microtox test. All co-toxicity effect of the sampling effluent from A , B and C electroplating factory exhibited the same anatagonistic effect. The toxicity of all effluent samples collected from electroplating factory are beyond the wastewater standard established by Environmental Protection Agency (EPA) by chemical analysis in Taiwan. The concentration of copper (Cu) in A and C factory by chemical analysis, are 14.13 and 14.12 mg/L, respectively. The concentration of Zinc (Zn) in A factory, are 11.60 mg/L. The correlation between the TUa of effluent water of electroplating factory by microtox test and COD of the same test water was low. R2 value between TUa and COD in A, B, and C factory are 0.771, 0.3 and 0.962, respectively.Our study data can supply the basic information for early warning of wastewater pollution from electroplating factory. The toxic trend of heavy metal from these two tested bioassays are the same. Microtox method seem to provide a fast wastewater pollution screening form electroplating factory, otherwise, the fish test can supply the chronic test tool for detection on waste water, too.
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