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首页> 外文期刊>Environmental toxicology and chemistry >DISSOLVED ORGANIC CARBON REDUCES THE TOXICITY OF ALUMINUM TO THREE TROPICAL FRESHWATER ORGANISMS
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DISSOLVED ORGANIC CARBON REDUCES THE TOXICITY OF ALUMINUM TO THREE TROPICAL FRESHWATER ORGANISMS

机译：溶解的有机碳降低了铝对三种热带淡水有机物的毒性

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摘要

The influence of dissolved organic carbon (DOC) on the toxicity of aluminum (Al) at pH 5 (relevant to acid mine drainage conditions), to the tropical green hydra (Hydra viridissima), green alga (Chlorella sp.), and cladoceran (Moinodaphnia macleayi) was assessed. Two DOC sources, a natural in situ DOC in soft billabong water (SBW) and Suwannee River fulvic acid (SRFA) standard, were compared. The order of sensitivity of the test organisms to dissolved Al (0.1 fim fraction) was Hydra viridissima > Moinodaphnia macleayi > Chlorella sp. with DOC reducing dissolved Al toxicity most for Hydra viridissima. However, colloidal or precipitated Al may contribute indirectly to the toxicity forM macleayi and Chlorella sp. The toxicity of dissolved Al was up to six times lower in test waters containing 10mgL~(-1) DOC (in the form of SRFA), relative to toxicity observed at 1 mgL~(-1)' DOC. In contrast, the toxicity of Al was up to two times lower in SBW containing 10mgL~(-1) DOC, relative to water containing 1 mgL~(-1) DOC. The increased ability of SRFA in reducing Al toxicity was linked to its greater affinity for complexing Al compared with the in situ DOC. This has important implications for studies that use commercial standards of humic substances to predict Al toxicity in local environments. Speciation modeling demonstrated that Al~(3+) and A1OH~(2+) provided a strong relationship with toxicity. An empirical relationship is provided for each organism that can be used to predict Al toxicity at a given Al and DOC concentration.
机译：溶解性有机碳（DOC）对pH 5（与酸性矿山排水条件有关）的铝（Al）对热带绿水仙（Hydra viridissima），绿藻（Chlorella sp。）和cladoceran（评估了褐飞虱（Moinodaphnia macleayi）。比较了两种DOC来源，分别是软比拉邦水（SBW）和Suwannee河黄腐酸（SRFA）标准中的天然原位DOC。测试生物对溶解的铝（0.1 fim分数）的敏感性顺序为：九头蛇> Moinodaphnia macleayi> Chlorella sp。 DOC可以最有效地减少九头蛇的溶解的铝毒性。但是，胶体或沉淀的铝可能间接导致麦克雷氏菌和小球藻的毒性。相对于在1 mgL〜（-1）'DOC处观察到的毒性，在含​​10mgL〜（-1）DOC（以SRFA形式）的测试水中溶解的Al的毒性低至六倍。相比之下，相对于含有1 mgL〜（-1）DOC的水，Al的毒性在含10mgL〜（-1）DOC的SBW中降低了两倍。与原位DOC相比，SRFA降低铝毒性的能力增强与其对络合铝的更大亲和力有关。这对使用腐殖质商业标准来预测当地环境中的铝毒性的研究具有重要意义。形态模拟表明，Al〜（3+）和Al〜（2+）与毒性有很强的关系。为每种生物提供了一种经验关系，可用来预测给定Al和DOC浓度下的Al毒性。

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  • 来源
    《Environmental toxicology and chemistry》 |2012年第2期|p.427-436|共10页
  • 作者

    Melanie A. Trenfield; Scott J. Markich; Jack C. Ng; Barry Noller; Rick A. van Dam;

  • 作者单位

    Ecotoxicology Program, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia,National Research Centre for Environmental Toxicology, The University of Queensland, Coopers Plains, Queensland, Australia;

    Aquatic Solutions International, Dundas, New South Wales, Australia;

    National Research Centre for Environmental Toxicology, The University of Queensland, Coopers Plains, Queensland, Australia;

    Centre for Mined Land Rehabilitation, The University of Queensland, St. Lucia, Queensland, Australia;

    Ecotoxicology Program, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fulvic acid; aluminum; toxicity; freshwater; dissolved organic carbon;

    机译：黄腐酸铝;毒性;淡水;溶解有机碳;

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