Phytoremediation potential of charophytes:Bioaccumulation and toxicity studies of cadmium,lead and zinc  

作　　者：Najjapak Sooksawat Metha Meetam Maleeya Kruatrachue Prayad Pokethitiyook Koravisd Nathalang 

机构地区：[1]Department of Biology,Faculty of Science,Mahidol University [2]Mahidol University International College

出　　处：《Journal of Environmental Sciences》2013年第3期596-604,共9页环境科学学报（英文版）

基　　金：supported by the grants from the Center of Excellence for Environmental Health,Toxicology and Management of Chemicals under Science&Technology Postgraduate Education and Research Development Office;the Royal Golden Jubilee Ph.D.Program under Thailand Research Fund

摘　　要：The ability for usage of common freshwater charophytes,Chara aculeolata and Nitella opaca in removal of cadmium （Cd）,lead （Pb） and zinc （Zn） from wastewater was examined.C.aculeolata and N.opaca were exposed to various concentrations of Cd （0.25 and 0.5 mg/L）,Pb （5 and 10 mg/L） and Zn （5 and 10 mg/L） solutions under hydroponic conditions for 6 days.C.aculeolata was more tolerant of Cd and Pb than N.opaca.The relative growth rate of N.opaca was drastically reduced at high concentrations of Cd and Pb although both were tolerant of Zn.Both macroalgae showed a reduction in chloroplast,chlorophyll and carotenoid content after Cd and Pb exposure,while Zn exposure had little effects.The bioaccumulation of both Cd and Pb was higher in N.opaca （1544.3 μg/g at 0.5 mg/L Cd,21657.0 μg/g at 10 mg/L Pb） whereas higher Zn accumulation was observed in C.aculeolata （6703.5 μg/g at 10 mg/L Zn）.In addition,high bioconcentration factor values （〉 1000） for Cd and Pb were observed in both species.C.aculeolata showed higher percentage of Cd and Pb removal （〉 95%） than N.opaca and seemed to be a better choice for Cd and Pb removal from wastewater due to its tolerance to these metals.The ability for usage of common freshwater charophytes,Chara aculeolata and Nitella opaca in removal of cadmium （Cd）,lead （Pb） and zinc （Zn） from wastewater was examined.C.aculeolata and N.opaca were exposed to various concentrations of Cd （0.25 and 0.5 mg/L）,Pb （5 and 10 mg/L） and Zn （5 and 10 mg/L） solutions under hydroponic conditions for 6 days.C.aculeolata was more tolerant of Cd and Pb than N.opaca.The relative growth rate of N.opaca was drastically reduced at high concentrations of Cd and Pb although both were tolerant of Zn.Both macroalgae showed a reduction in chloroplast,chlorophyll and carotenoid content after Cd and Pb exposure,while Zn exposure had little effects.The bioaccumulation of both Cd and Pb was higher in N.opaca （1544.3 μg/g at 0.5 mg/L Cd,21657.0 μg/g at 10 mg/L Pb） whereas higher Zn accumulation was observed in C.aculeolata （6703.5 μg/g at 10 mg/L Zn）.In addition,high bioconcentration factor values （〉 1000） for Cd and Pb were observed in both species.C.aculeolata showed higher percentage of Cd and Pb removal （〉 95%） than N.opaca and seemed to be a better choice for Cd and Pb removal from wastewater due to its tolerance to these metals.

关 键 词：charophyte Chara aculeolata Nitella opaca cadmium lead zinc phytoremediation 

分 类 号：X173[环境科学与工程—环境科学]