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首页> 外文期刊>Environmental Science & Technology >Dissolved Organic Carbon Reduces Uranium Bioavailability and Toxicity. 1. Characterization of an Aquatic Fulvic Acid and Its Complexation with Uranium[VI]
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Dissolved Organic Carbon Reduces Uranium Bioavailability and Toxicity. 1. Characterization of an Aquatic Fulvic Acid and Its Complexation with Uranium[VI]

机译：溶解的有机碳降低了铀的生物利用度和毒性。 1.一种水产黄腐酸的表征及其与铀的络合[VI]

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摘要

Fulvic acid (FA) from a tropical Australian billabong (lagoon) was isolated with XAD-8 resin and characterized using size exclusion chromatography, solid state cross-polarization magic angle spinning, 13C nuclear magnetic resonance spectroscopy, elemental analysis, and potentiometric acid-base titration. Physicochemical characteristics of the billabong FA were comparable with those of the Suwannee River Fulvic Acid (SRFA) standard. The greater negative charge density of the billabong FA suggested it contained protons that were more weakly bound than those of SRFA, with the potential for billabong water to complex less metal contaminants, such as uranium (U). This may subsequently influence the toxicity of metal contaminants to resident freshwater organisms. The complexation of U with dissolved organic carbon (DOC) (10 mg L"1) in billabong water was calculated using the HARPHRQgeochemical speciation model and also measured using flow field-flow fractionation combined with inductively coupled plasma mass-spectroscopy. Agreement between both methods was very good (within 4% as U-DOC). The results suggest that in billabong water at pH 6.0, containing an average DOC of 10 mg L l and a U concentration of 90 fig L"1, around 10% of U is complexed with DOC.
机译：用XAD-8树脂分离了热带澳大利亚Billabong（泻湖）中的富勒酸（FA），并使用尺寸排阻色谱，固态交叉极化魔角旋转，13C核磁共振波谱，元素分析和电位酸碱对其进行了表征。滴定。 Billabong FA的理化特性与Suwannee河黄腐酸（SRFA）标准相当。比拉邦FA的负电荷密度更高，表明它所含的质子比SRFA的质子束缚更弱，并且有可能使比拉邦水络合较少的金属污染物，例如铀（U）。随后可能会影响金属污染物对驻留的淡水生物的毒性。使用HARPHRQ地球化学形态模型计算U与Billabong水中的溶解有机碳（DOC）（10 mg L“ 1）的络合物，并使用流场-流分馏结合电感耦合等离子体质谱法进行测量。两种方法之间的一致性结果非常好（以U-DOC计为4％以内）。结果表明，在pH 6.0的比拉邦水中，平均DOC为10 mg L l，U浓度为90图L“ 1，其中约10％是U。与DOC复合。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.3075-3081|共7页
  • 作者

    Melanie A Trenfield; Suzanne McDonald; Krisztina Kovacs; Emily K. Lesher; Jennifer M. Pringle; Scott J. Markich; Jack C. Ng; Barry Noller; Paul L. Brown; Rick A. van Dam;

  • 作者单位

    Ecotoxicology Program, Environmental Research Institute of the Supervising Scientist, GPO Box 461, Darwin, NT 0801, Australia,The University of Queensland, National Research Centre for Environmental Toxicology, Coopers Plains, Queensland 4108, Australia;

    Curtin Water Quality Research Centre, Curtin University, Bentley, Western Australia 6102, Australia;

    Department of Physical Chemistry and Material Science, University of Szeged, Szeged H-6720, Hungary;

    Environmental Science and Engineering Division, Colorado School of Mines, Golden, Colorado, United States;

    Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia;

    Aquatic Solutions International, Dundas, New South Wales 2117, Australia;

    The University of Queensland, National Research Centre for Environmental Toxicology, Coopers Plains, Queensland 4108, Australia;

    The University of Queensland, Centre for Mined Land Rehabilitation, St. Lucia, Queensland 4067, Australia;

    Rio Tinto Technology and Innovation, 1 Research Avenue, Bundoora 3083, Australia;

    Ecotoxicology Program, Environmental Research Institute of the Supervising Scientist, GPO Box 461, Darwin, NT 0801, 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);
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