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PREDICTING ANIMAL CADMIUM CONCENTRATIONS IN LAKES

机译：预测湖泊中的动物镉浓度

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摘要

HUMAN activities have greatly increased the flux of many potentially toxic metals to aquatic ecosystems(1). The development and implementation of effective remedial measures depend on our ability to predict the fate and effects of metals in these systems. Models based on sound physical-chemical and biological principles, such as the free-ion activity model(2-5), have shown great potential as predictive tools. This model has been effective in explaining the central role of the free-ion concentration (or activity) as a regulator of interactions (uptake, toxicity) between metals and aquatic organisms(2,3). It postulates that the biological effects of metals are best predicted by the activity of the free metal ion, rather than by total metal concentration. Because this model was developed in the laboratory under unnatural experimental conditions, it must be validated in field situations before being generally used in nature(3). We report here that Cd concentrations in an indigenous aquatic insect larva, Chaoborus punctipennis, are best described by the free-ion activity model, provided that competition for biological uptake sites between hydrogen ions and free cadmium ions, as well as cadmium complexation by natural organic matter, are explicitly taken into account. Our results suggest that the free-ion model would provide an effective theoretical framework for the use of animals as indicators of metal contamination in nature. [References: 20]
机译：人类活动大大增加了许多潜在有毒金属向水生生态系统的通量（1）。有效补救措施的制定和实施取决于我们预测这些系统中金属的命运和影响的能力。基于良好的物理化学和生物学原理的模型，例如自由离子活性模型（2-5），已显示出巨大的潜力，可作为预测工具。该模型有效地解释了游离离子浓度（或活性）作为金属与水生生物之间相互作用（摄取，毒性）的调节剂的核心作用（2,3）。它假定金属的生物效应最好通过游离金属离子的活性而不是总金属浓度来预测。由于该模型是在实验室中非自然实验条件下开发的，因此必须先在野外验证，然后才能在自然界中广泛使用（3）。我们在此报告，通过自由离子活性模型可以最好地描述本地水生昆虫幼虫Chaoprus punctipennis中的Cd浓度，前提是竞争氢离子和游离镉离子之间的生物摄取位点，以及天然有机物对镉的络合作用物质，明确考虑在内。我们的结果表明，自由离子模型将为使用动物作为自然界中金属污染的指标提供有效的理论框架。 [参考：20]

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  • 来源
    《Nature》 |1996年第6573期|p. 430-432|共3页
  • 作者

    Hare L.; Tessier A.;

  • 作者单位

    UNIV QUEBEC INRS EAU ST FOY PQ G1V 4C7 CANADA;

  • 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 自然科学总论;
  • 关键词

    Binding; Copper;

    机译：装订;铜;

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