Arsenite Oxidation by Dunaliella salina is Affected by External Phosphate Concentration

Bulletin of Environmental Contamination and Toxicology
Ya WangYing Ge

Abstract

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...Continue Reading

References

Jul 28, 2004·Toxicology and Applied Pharmacology·Seishiro HiranoAmjad Shraim
Oct 20, 2005·Journal of Bioscience and Bioengineering·Takashi HirookaKazuhisa Miyamoto
Jan 24, 2006·Journal of Bacteriology·Des R KashyapTimothy R McDermott
Apr 2, 2008·Aquatic Toxicology·Irina B KaradjovaDimiter L Tsalev
Oct 7, 2011·International Journal of Phytoremediation·Ying JiangHemda Garelick
Aug 24, 2013·Science·Luis Rodríguez-LadoC Annette Johnson
Dec 24, 2013·Environmental Science & Technology·Siyu ZhangYong-Guan Zhu
Dec 23, 2016·Journal of Environmental Sciences (China)·Yuqing GuoJun Ye
Jul 25, 2017·Environmental Science and Pollution Research International·Ya WangYing Ge

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