集胞藻(Synechocystis sp.PCC6803)对砷吸收转化特性的初步研究Study on Absorption and Transformation of Arsenic in Blue Alga(Synechocystis sp.PCC6803)
张兵;王利红;徐玉新;尹西翔;
摘要(Abstract):
砷是一种广泛存在于环境中的有毒物质。集胞藻属于单细胞藻类,广泛分布在淡水生态环境中。采用营养液培养的方法探讨了集胞藻(Synechocystis sp.PCC6803)对砷的累积和转化特性。当集胞藻分别暴露于2和100 μM的无机As(Ⅲ)和As(V)14d后,体内的砷形态均以As(V)为主,并且在100μM浓度处理下检测到DMA,结果表明集胞藻体内存在砷的氧化和还原机制,只有高浓度砷才能诱导集胞藻体内的砷甲基化机制起作用。研究了集胞藻在含磷培养基中对不同形态砷的吸收动力学特征,As(Ⅲ)的最大吸收速率大于As(V)的最大吸收速率,而集胞藻对As(V)的亲和性大于As(Ⅲ)。考察了集胞藻对含砷溶液的净化作用,72h集胞藻净化效率能达到41%,此结果表明集胞藻具有修复砷污染水体的潜力。
关键词(KeyWords): 集胞藻;三价砷;五价砷
基金项目(Foundation): 山东省博士基金(No.BS2009HZ024)
作者(Author): 张兵;王利红;徐玉新;尹西翔;
Email:
DOI:
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