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Chemical composition of dissolved organic matter from various sources as characterized by solid-state NMR

机译：固态NMR表征各种来源的溶解有机物的化学组成

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摘要

This study used solid-state nuclear magnetic resonance techniques to characterize the chemical compositions of DOM from various sources and thereby explore the linkages of river DOM to its potential point and nonpoint sources. DOM samples were isolated from two streams draining watersheds of different land uses, landfill leachates of two ages, sequential (raw, facility- and wetland-treated) wastewaters in a wastewater treatment plant. Two sampling sites along the Missouri River were located upstream and downstream of the outlet of a tributary, to which the stream waters, landfill leachates, and wastewater effluents were discharged. Compared with the chemical composition of the stream DOM from a cropland-dominated watershed, the stream DOM from a grass/forestland-dominated watershed comprised 14 % more alkyl carbons (C), but similar to 5 % less O-alkyl C. The two leachate DOM samples from landfill cells of two ages showed similar area fractions of the carbon types, and their spectra exhibited a characteristic alkyl C peak at 37 ppm, potentially a molecular signature of the DOM of landfill leachate source. The DOM from the treated wastewater had slightly (similar to 4 %) less alkyl C than that from the raw wastewater, and the DOM from the wetland-treated wastewater displayed decreased O-alkyl C but increased alkyl C, both to a small degree (by similar to 4 %), compared to the DOM in the facility-treated wastewater. The chemical composition of DOM in the Missouri River was affected by the local organic inputs, with the DOM from downstream the outlet displaying similar to 11 % higher alkyl C.
机译：这项研究使用固态核磁共振技术来表征来自各种来源的DOM的化学成分，从而探索河流DOM与其潜在点和非点源的联系。从不同土地用途的两个流域排水流，两个年龄的垃圾渗滤液，废水处理厂中的顺序（原始，设施和湿地处理）废水中分离出DOM样品。密苏里河沿岸的两个采样点位于支流出口的上游和下游，溪流水，垃圾填埋场渗滤液和废水被排放到其中。与以农田为主的流域的DOM的化学成分相比，以草/林为主的流域的DOM的烷基碳（C）多了14％，但与O-烷基C的少约5％。两者来自两个年龄的垃圾填埋场的渗滤液DOM样品显示出相似的碳类型面积分数，其光谱在37 ppm处显示出特征性的烷基碳峰，这可能是垃圾渗滤液来源DOM的分子特征。经过处理的废水中的DOM比原废水中的烷基碳含量略低（约4％），而经湿地处理后的废水中的DOM显示出O-烷基C含量降低，但烷基C含量均升高了一个程度（与经设施处理的废水中的DOM相比，降低了约4％）。密苏里河中DOM的化学成分受当地有机物输入的影响，出口下游的DOM烷基碳含量约高11％。

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  • 来源
    《Aquatic Sciences》 |2015年第4期|595-607|共13页
  • 作者

    Zhou Zhigao; Hua Bin; Cao Xiaoyan; Yang John; Olk Dan C.; Deng Baolin; Liu Fengjing; Li Renying; Mao Jingdong;

  • 作者单位

    Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA|Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Jiangsu, Peoples R China;

    Lincoln Univ Missouri, Dept Agr & Environm Sci, Jefferson City, MO 65102 USA;

    Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA;

    Lincoln Univ Missouri, Dept Agr & Environm Sci, Jefferson City, MO 65102 USA;

    USDA ARS, Natl Lab Agr & Environm, Ames, IA 50011 USA;

    Univ Missouri, Dept Civil & Environm Engn, Columbia, MO 65211 USA;

    Lincoln Univ Missouri, Dept Agr & Environm Sci, Jefferson City, MO 65102 USA;

    Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA|Nanjing Univ Informat Sci & Technol, Coll Appl Meteorol, Nanjing 210044, Jiangsu, Peoples R China;

    Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA 23529 USA;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dissolved organic matter (DOM); Chemical composition; Pointon-point source; Freshwater; Nuclear magnetic resonance (NMR);

    机译：溶解性有机物;化学成分;点/非点源;淡水;核磁共振;

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