Biosorption and toxicity responses to arsenite (As[III]) in Scenedesmus quadricauda.
Biosorption and toxicity responses to arsenite (As[III]) in Scenedesmus quadricauda.
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DOI：
10.1016/j.chemosphere.2013.01.002
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发表时间：
2013-08
期刊：
影响因子：
8.8
通讯作者：
Jianying Zhang;Tengda Ding;Chunlong Zhang
中科院分区：
文献类型：
--
作者：
Jianying Zhang;Tengda Ding;Chunlong Zhang
以我国淡水中最常见的绿色藻类四尾栅藻（Scenedesmus quadricauda）为研究对象，研究了96 h暴露条件下砷（As [III]）的毒性和生物吸附效应。结果表明，pH值对H2阿索3-和H3阿索3-形态的影响对砷的生物吸附和毒性起着重要作用.通过比较藻细胞数、叶绿素a含量和透射电镜观察的超微结构变化，发现未解离态H3阿索3比其单阴离子H2阿索3-的毒性更强。在pH和Eh条件下，初始pH为9.3和初始pH为8.2时，H2阿索3-的吸附量分别为89.0 mg g− 1和25.2 μg g g − 1。我们的结果表明S. quadricauda可能为去除受污染地表水中的有毒亚砷酸盐物种提供新的手段。
Toxicity and biosorption responses to arsenite (As [III]) were examined in a 96-h exposure study using Scenedesmus quadricauda, one of the most popular green algae distributed in freshwaters in China. Results indicated that the pH-dependent distribution of two arsenite species (H 2 AsO 3-and H 3 AsO 3) played an important role in biosorption and toxicity. The undissociated H 3 AsO 3 was more toxic than its monoanionic H 2 AsO 3-through comparison of algal cell numbers, chlorophyll-a contents, and algal ultrastructural changes observed with transmission electron microscopy. An effective biosorption of 89.0 mg g− 1 at 100 mg L− 1 As [III] was found in the treatments with an initial pH of 9.3 and 25.2 μg g− 1 at 0.03 mg L− 1 As [III] at an initial pH of 8.2 as a result of the predominant species of H 2 AsO 3-under the ambient pH and Eh conditions. Our results imply that S. quadricauda may provide a new means for the removal of toxic arsenite species present in contaminated surface water.