Biomethylation and volatilization of arsenic by the marine microalgae Ostreococcus tauri.
Biomethylation and volatilization of arsenic by the marine microalgae Ostreococcus tauri.
复制标题
DOI：
10.1016/j.chemosphere.2013.04.063
复制
发表时间：
2013-09
期刊：
影响因子：
8.8
通讯作者：
Si-Yu Zhang;Guoxin Sun;Xi Yin;C. Rensing;Yong-guan Zhu
中科院分区：
文献类型：
--
作者：
Si-Yu Zhang;Guoxin Sun;Xi Yin;C. Rensing;Yong-guan Zhu
牛链藻是一种海洋绿色微藻，广泛分布于沿海和贫营养沃茨中，是海洋浮游植物群落的模式生物。结果表明，该菌能耐受100 μM以下的As（V）和As（V），且随着As（V）浓度的增加（0-50 μM），细胞内As含量显著增加（P< 0.01）。结果表明，藻类细胞介导砷的生物转化。测定了挥发性砷的含量，并研究了O.金牛座被证明。As（V）到As（III）的还原可能是As甲基化和从海水中挥发的限制步骤，因为与As（V）相比，用As（III）处理产生了5倍多的挥发性As。由于海洋面积巨大（71%），浮游植物数量众多，砷在海洋环境中的生态地球化学循环可能起着重要作用。
Ostreococcus tauriis a marine green microalga, recognized as a model organism of the marine phytoplankton assemblage and widely distributed from coastal to oligotrophic waters. This study showed it could tolerate both arsenite and arsenate concentrations of up to 100 μM, and cellular As concentration increased significantly (P< 0.01) with increasing concentration of As(V) in the medium (0–50 μM). It was revealed that As biotransformations were mediated by algal cells. Volatilized As was detected and the ability of As biovolatilization byO. tauriwas demonstrated. The reduction of As(V) to As(III) might be the limiting step for As methylation and volatilization from seawater since the treatment with As(III) yielded five times more volatile As as compared to that with As(V). Arsenic biogeochemical cycle in the marine environment might play an important role based on the huge surface area of ocean (71%) and the massive number of marine phytoplankton.