Exposure-response of Cr-Ⅲ-organic complexes to saccharomyces cerevisiae
Bioreduction of Cr (VI)to less toxic and less mobile Cr(lII)is considered to be a viable clean up option.Cr(VI) bioreduction also produces soluble Cr(IlI)-organic complexes with insoluble Cr(IlI)compounds.Though little is known about the fate and behaviour of soluble Cr-Ⅲ-organic in the environment,it is reported that once Cr-(III)-organic complexes are formed,they are relatively stable,due to the slow ligand exchange properties of Cr(III).There is no reported data about the toxicity of the Cr-(III)-organic complexes.The aim of this current research is to investigate the bioavailability and toxicity of the soluble Cr-III-organic complexes.For the experimental purpose Saccharomyces cereviciae L-1 wild type yeast strain was chosen as model organism and Cr-Ⅲ-citrate was selected as the representative compound of the Cr-(Ⅲ)-organic complexes.Growth inhibition,direct viable cell count,dry biomass,biosorption as well as the amount of CO2 production were measured to explore the potential for short-term chronic aquatic toxicity tests of the Cr-(Ⅲ)-citrate.Cr-(Ⅲ)-citrate exerted the tOxicity with an EC50,calculated from the％growth inhibition,of 51.03 mg/L.These toxicity data would be helpful to define the toxic potential of the organo-chromium-III compounds in the environment.
Cr-Ⅲ-Organic complexes Saccharomyces cerevisiae Toxicity EC50 Bioavailability
Nivedita CHATTERJEE Zejiao LUO
Key Laboratory of Biogeology and Environmental Geology,Ministry of Education(BGEG),School of Environmental Studies,China University of Geosciences,Wuhan,Hubei 430074,China
国际会议
西安
英文
587-597
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）