Arsenite Oxidation by Dunaliella salina is Affected by External Phosphate Concentration

文献类型： 外文期刊

第一作者： Wang, Ya

作者： Wang, Ya;Ge, Ying;Wang, Ya;Yu, Xiangyang;Wang, Ya;Yu, Xiangyang;Zhang, Chunhua

作者机构：

关键词： Arsenite oxidation; Dunaliella salina; Phosphate; 2; 4-dinitrophenol

期刊名称：BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.151； 五年影响因子：2.129 ）

ISSN： 0007-4861

年卷期： 2020 年 105 卷 6 期

页码：

收录情况： SCI

摘要： Arsenic (As) contamination in terrestrial and aquatic environments is a well-known global environmental problem. The biooxidation of arsenite [As(III)] and subsequent arsenate [As(V)] removal have increasingly been used for remediation of As-polluted groundwater. However, little is known about As(III) oxidation by microalgae, especially those from saltwater environments. In this study, we investigated As(III) toxicity and oxidation in the marine microalga Dunaliella salina in the presence of different phosphate concentrations. The results of the As(III) toxicity experiments showed that D. salina was tolerant to As(III) (5.4 +/- 0.31 mg As L-1 at 72 h of culture). The As(V) percentage in the P-enriched (11.2 mg L-1) medium was 7.2-fold greater than in the P-deficient one after 24-h exposure, indicating As(III) oxidation by D. salina was more pronounced with increased phosphate levels. Treatment of As(III) with and without 2,4-dinitrophenol (DNP) on the algal cells showed that As(III) oxidation occurred mainly on the cell surface and in the cytoplasm of D. salina. The results of this study suggest that transformation of As(III) into As(V) may be an important pathway of detoxification in D. salina and that phosphate plays a key role in this oxidation process.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序