EDTA对轮叶黑藻体系中砷迁移转化的影响  

Effects of EDTA on the Migration and Transformation of Arsenic in the System of Hydrilla verticillata

作　　者：钟彪 黄中情 宋梦萍 曾绍宇 刘雯清 何发涛 杨常亮[2] ZHONG Biao;HUANG Zhongqing;SONG Mengping;ZENG Shaoyu;LIU Wenqing;HE Fatao;YANG Changliang(Institute of International Rivers and Eco-security,Yunnan University,Kunming 650091,China;School of Ecology and Environment Science,Yunnan University,Kunming 650091,China)

机构地区：[1]云南大学国际河流与生态安全研究院,云南昆明650091 [2]云南大学生态与环境学院,云南昆明650091

出　　处：《环境科学与技术》2024年第2期89-95,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目(51168047)。

摘　　要：该研究以砷污染的湖泊沉积物和轮叶黑藻为研究对象,探讨了乙二胺四乙酸(EDTA)对轮叶黑藻体系中砷迁移转化的影响机制。结果表明:0.5 mg/L EDTA显著促进沉积物中的砷释放到上覆水中。0.5和5.8 mg/L EDTA增强了轮叶黑藻对砷的富集能力,EDTA促进植物将砷酸盐[As(Ⅴ)]还原为亚砷酸盐[As(Ⅲ)],提高了植物体内砷的甲基化作用,降低了砷的毒性。5.8 mg/L EDTA介导下,植物保持较高的光合色素、蛋白质和丙二醛含量,以及产生大量的超氧化物歧化酶、过氧化氢酶和还原型谷胱甘肽酶来抵抗砷的胁迫。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.

关 键 词：砷 乙二胺四乙酸 轮叶黑藻 迁移与转化 

分 类 号：X524[环境科学与工程—环境工程] X173