Effects of EDTA on the Migration and Transformation of Arsenic in the System of Hydrilla verticillata
This study focused on arsenic-contaminated lake sediments and Hydrilla verticillata obenifera to investigate the effects of ethylenediaminetetraacetic acid(EDTA)on arsenic migration and transformation in the Hydrilla verticillata system.The results showed that 0.5 mg/L EDTA significantly promoted the release of arsenic from sediments into overlying water.0.5 and 5.8 mg/L EDTA not only enhanced the enrichment of arsenic by Hydrilla verticillata,but also promoted the reduction of arsenate[As(Ⅴ)]to arsenite[As(Ⅲ)]by plants,and the methylation of arsenic to reduce arsenic toxicity.EDTA allowed plants to maintain high levels of photosynthetic pigments.5.8 mg/L EDTA promoted plants to maintain high levels of photo-synthetic pigments,proteins,and malondialdehyde,as well as large amounts of superoxide dismutase,catalase,and reduced glutathione in plants to resist arsenic stress.
arsenicethylenediaminetetraacetic acidHydrilla verticillatamigration and conversion
万方数据
维普
