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首页> 外文期刊>Environmental Science & Technology >Metal Complexation Properties of Freshwater Dissolved Organic Matter Are Explained by Its Aromaticity and by Anthropogenic Ligands
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Metal Complexation Properties of Freshwater Dissolved Organic Matter Are Explained by Its Aromaticity and by Anthropogenic Ligands

机译：淡水溶解有机物的金属络合特性通过其芳香性和人为配体来解释

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摘要

Dissolved organic matter (DOM) in surface waters affects the fate and environmental effects of trace metals. We measured variability in the Cd, Cu, Ni, and Zn affinity of 23 DOM samples isolated by reverse osmosis from freshwaters in natural, agricultural, and urban areas. Affinities at uniform pH and ionic composition were assayed at low, environmentally relevant free Cd, Cu, Ni, and Zn activities. The C-normalized metal binding of DOM varied 4-fold (Cu) or about 10-fold (Cd, Ni, Zn) among samples. The dissolved organic carbon concentration ranged only 9-fold in the waters, illustrating that DOM quality is an equally important parameter for metal complexation as DOM quantity. The UV-absorbance of DOM explained metal affinity only for waters receiving few urban inputs, indicating that in those waters, aromatic humic substances are the dominant metal chelators. Larger metal affinities were found for DOM from waters with urban inputs. Aminopolycarboxylate ligands (mainly EDTA) were detected at concentrations up to 0.14/iM and partly explained the larger metal affinity. Nickel concentrations in these surface waters are strongly related to EDTA concentrations (R2 = 0.96) and this is underpinned by speciation calculations. It is concluded that metal complexation in waters with anthropogenic discharges is larger than that estimated with models that only take into account binding on humic substances.
机译：地表水中的溶解有机物（DOM）影响痕量金属的命运和环境影响。我们测量了通过反渗透从自然，农业和城市地区的淡水中分离出的23个DOM样品中Cd，Cu，Ni和Zn亲和力的变异性。在低，与环境相关的游离Cd，Cu，Ni和Zn活性下测定了均一的pH和离子组成下的亲和力。在样品中，DOM的C归一化金属结合变化了4倍（Cu）或约10倍（Cd，Ni，Zn）。在水中溶解的有机碳浓度范围仅为9倍，这说明DOM质量与DOM数量一样是金属络合的重要参数。 DOM的紫外线吸收性仅对城市输入很少的水具有金属亲和力，表明在这些水中，芳香族腐殖质是主要的金属螯合剂。发现具有城市投入物的水中的DOM具有更大的金属亲和力。在高达0.14 / iM的浓度下检测到氨基聚羧酸盐配体（主要是EDTA），部分解释了较大的金属亲和力。这些地表水中的镍浓度与EDTA浓度密切相关（R2 = 0.96），这通过形态计算得到支持。结论是，人为排放的水中的金属络合物比仅考虑与腐殖质结合的模型所估计的络合物更大。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2584-2590|共7页
  • 作者

    Stijn Baken; Fien Degryse; Liesbeth Verheyen; Roel Merckx; Erik Smolders;

  • 作者单位

    Division of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20 - bus 2459, 3001 Heverlee, Belgium;

    Division of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20 - bus 2459, 3001 Heverlee, Belgium;

    Division of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20 - bus 2459, 3001 Heverlee, Belgium;

    Division of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20 - bus 2459, 3001 Heverlee, Belgium;

    Division of Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20 - bus 2459, 3001 Heverlee, Belgium;

  • 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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