| 水环境中天然溶解有机质分子量的研究现状及意义 |
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| 引用本文： | 岳兰秀,刘丛强,吴丰昌.水环境中天然溶解有机质分子量的研究现状及意义[J].环境科学与管理,2010,35(4):29-34. |
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| 作者姓名： | 岳兰秀 刘丛强 吴丰昌 |
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| 作者单位： | [1]首钢工学院,北京100041 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550002 |
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| 基金项目： | 中国科学院"百人计划"项目，科技部973课题及中国科学院重要方向项目 |
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| 摘 要： | 溶解有机质存在于所有的水环境中,它是组成不均匀、结构复杂和分子量分布很宽的有机化合物混合体。本文综述了测量溶解有机质分子量的主要方法,各种方法的原理和优缺点,其中详细介绍了高效体积排阻色谱法的原理,平均分子量和分散系数的计算,以及分子量的校正;同时介绍了可能影响分子量分布的主要地球化学因素,以及天然水中溶解有机质的分子量分布的特征。
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| 关 键 词： | 溶解有机质 分子量分布 高效体积排阻色谱法 |
Development of Studies on Molecular Weight of Humic Substances in Natural Environment |
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| Yue Lanxiu,Liu Congqiang,Wu Fengchang.Development of Studies on Molecular Weight of Humic Substances in Natural Environment[J].Environmental Science and Management,2010,35(4):29-34. |
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| Authors: | Yue Lanxiu Liu Congqiang Wu Fengchang |
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| Institution: | 1.Shougang Institute of Technology,Beijing 100041,China; 2.The Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China) |
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| Abstract: | Dissolved organic matter（DOM）is a complex compound with wide molecular weight.There are many methods to determine the molecular weight of DOM,including high performance size exclusion chromatography（HPSEC）,ultrafiltration（UF）,ultracentrifugation（UC）,vapor pressure osmometry（VPO）,and flow field flow fractionation（FFFF）.The most extensively used method is HPSEC.We introduce the theory of HPSEC,its advantages and disadvantages,and the calibration method.Many factors influenced the molecular weight of DOM,including the source of DOM,photo-and micro-degradation,and catalytic-oxidation condition.The HPSEC chromatogram was divided into four fractions with different molecular weight：large,medium-large,medium and small fraction,with MW3500Da,3500-2000Da,2000-1000Da and 1000Da,respectively. |
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| Keywords: | dissolved organic matter molecular weight distribution high performance size exclusion chromatography |
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