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首页> 外文期刊>Environmental Science & Technology >Effect of Organic Complexation on Copper Accumulation and Toxicity to the Estuarine Red Macroalga Ceramium tenuicorne: A Test of the Free Ion Activity Model
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Effect of Organic Complexation on Copper Accumulation and Toxicity to the Estuarine Red Macroalga Ceramium tenuicorne: A Test of the Free Ion Activity Model

机译：有机络合对铜累积和对河口红Macroalga Ceramium tenuicorne毒性的影响：游离离子活性模型的测试

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摘要

Current water quality criteria (WQC) regulations on copper toxicity to biota are still based on total dissolved (<0.4 fim membrane filter) copper concentrations with a hardness modification for freshwaters. There are however ongoing efforts to incorporate metal speciation in WQC and toxicity regulations (such as the biotic ligand model-BLM) for copper and other metals. Here, we show that copper accumulation and growth inhibition of the Baltic macroalga Ceramium tenuicorne exposed to copper in artificial seawater at typical coastal and estuarine DOC concentrations (similar to 2-4 mg/L-C as fulvic acid) are better correlated to weakly complexed and total dissolved copper concentrations rather than the free copper concentration [Cu2+]. Our results using a combination of competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV) measurements and model calculations (using visual MINTEQ. incorporating the Stockholm Humic Model) show that copper accumulation in C. tenuicorne only correlates linearly well to [Cu2+] at relatively high [Cu +] and in the absence of fulvic acid. Thus the FIAM fails to describe copper accumulation in C. tenuicorne at copper and DOC concentrations typical of most marine waters. These results seem to indicate that at ambient total dissolved copper concentration in coastal and estuarine waters, C. tenuicorne might be able to access a sizable fraction of organically complexed copper when free copper concentration to the cell membrane is diffusion limited.
机译：当前有关铜对生物群毒性的水质标准（WQC）法规仍基于总溶解（<0.4微米膜过滤器）铜浓度，并对淡水进行了硬度修改。但是，人们仍在努力将金属形态纳入WQC和针对铜和其他金属的毒性法规（例如生物配体模型BLM）。在这里，我们表明，在典型沿海和河口DOC浓度（类似于2-4 mg / LC的富里酸）下，人工海水中暴露于铜的波罗的海大型藻天牛角的铜累积和生长抑制与弱络合和总弱相关性更好。溶解的铜浓度而不是游离的铜浓度[Cu2 +]。我们使用竞争性配体交换-吸附阴极溶出伏安法（CLE-ACSV）测量和模型计算（使用可视化MINTEQ。纳入Stockholms Humic Model）相结合的结果表明，在C. tenuicorne中的铜积累仅与[Cu2 +]线性相关。在较高的[Cu +]和没有富里酸的情况下。因此，FIAM未能描述大多数海水中典型的铜和DOC浓度下的角ten鱼中的铜积累。这些结果似乎表明，在沿海和河口水域的环境中总溶解铜浓度下，当游离铜浓度对细胞膜的扩散受到限制时，C。tenuicorne可能能够获得相当一部分有机络合铜。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.3145-3153|共9页
  • 作者

    Erik Ytreberg; Jenny Karlsson; Sabina Hoppe; Britta Eklund; Kuria Ndungu;

  • 作者单位

    Department of Applied Environmental Science, Stockholm University, S-106 91 Stockholm, Sweden;

    Department of Applied Environmental Science, Stockholm University, S-106 91 Stockholm, Sweden;

    Department of Applied Environmental Science, Stockholm University, S-106 91 Stockholm, Sweden;

    Department of Applied Environmental Science, Stockholm University, S-106 91 Stockholm, Sweden;

    Department of Applied Environmental Science, Stockholm University, S-106 91 Stockholm, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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