Toxicity of tri-and penta-valent arsenic alone and in combination to the Cladoceran Daphnia carinata : The influence of microbial transformation in natural waters
The acute toxicity of arsenic (III) and arsenic (V) alone and in combination to a cladoceran, Daphnia carinata, was studied in both cladoceran culture medium and natural water collected from a local suburban stream The results of this investigation sug-gests that As (III) and As (V) can interact either synergistically or additively resulting in an increase in the overall toxicity of mix-ture compared to individual As species. Furthermore, the indigenous microorganisms in natural water could play a significant role in the transformation of As, thereby influencing the toxicity of As in receiving waters. This study suggests that these two species of As when present together above 0. 1 mg · L-1> concentration are toxic to fresh water invertebrates and, therefore, pollution with these compounds may adversely affect natural ecosystems.
Arsenic speciation toxicity Daphnia carinata transformation
W. He M Megharaj R. Naidu R. Naidu
Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
534-535
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）