Influence of Complexation and pH on Individual and Combined Heavy Metal Toxicity to a Freshwater Green Alga
Influence of Complexation and pH on Individual and Combined Heavy Metal Toxicity to a Freshwater Green Alga
复制标题
络合和 pH 对淡水绿藻单独和组合重金属毒性的影响
DOI：
10.1139/f87-140
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Y. Chau
中科院分区：
文献类型：
--
作者：
M. Starodub;P. Wong;C. Mayfield;Y. Chau
The effect of complexation and pH on heavy metal (Cu, Zn, Pb) toxicity to a freshwater green alga, Scenedesmus quadricauda, was investigated. Extracellular ligands produced by S. quadricauda were capable of binding heavy metals and reducing their single and combined toxicities. Apparent complexing capacities and the ability of the sediment humics and artificial complexing agents such as ethylenediaminetetraacetic acid (EDTA), citric acid, and glycolic acid to ameliorate Cu, Zn, or Pb toxicity were also assessed. The toxicity of metals to algal growth was enhanced at acidic pH. Combined toxicity of these metals was significantly greater at pH 4.5 than at pH 8.5 or pH 6.5. Synergistic effects (between Cu, Zn, and Pb) towards algal growth increased at low pH. Specific heavy metals, their respective concentrations, the presence of complexing ligands, and pH influence both individual and combined heavy metal toxicities.
