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首页> 外文期刊>Environmental toxicology and chemistry >EFFECTS OF RICE STRAW-DERIVED DISSOLVED ORGANIC MATTER ON PYRENE SORPTION BY SOIL
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EFFECTS OF RICE STRAW-DERIVED DISSOLVED ORGANIC MATTER ON PYRENE SORPTION BY SOIL

机译：稻草提取物溶解的有机物对土壤吸附P的影响

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摘要

The objectives of the present study were to elucidate the chemical and structural properties of dissolved organic matter (DOM) derived from aerobic decay of rice straw and to quantify the effect of the DOM on the sorption of pyrene on soil. The DOM samples were obtained from microcosms incubated at 0, 21, 63, and 180 d. The bulk DOM samples were fractionated to four fractions: hydrophilic matter (HIM), acid-insoluble matter (AIM), hydrophobic acid (HOA), and hydrophobic neutral (HON) fractions. The bulk DOM and the four DOM fractions were characterized for their elemental compositions and functionalities. The results showed that HIM had the highest H/C atomic ratios, whereas HOA and AIM had the lowest H/C atomic ratios. These DOM samples were used as the background DOMs in the initial aqueous solutions for measuring sorption of pyrene on a paddy soil. The results indicated that, among the four DOM fractions, HOA, HON, and AIM significantly lowered the pyrene sorption coefficients, but HIM had little or no effect on the pyrene sorption by the soil. It appears that less polar AIM and HON had stronger binding affinities for pyrene in water, reducing the sorption coefficient for the soil, whereas more polar and less aromatic HIM had much weaker binding affinity for pyrene in water, causing little or no effect on the pyrene sorption by the soil. The present study showed that rice straw-derived DOM may enhance desorption and transport of organic pollutants in soil-water systems.
机译：本研究的目的是阐明稻草有氧腐烂产生的溶解性有机物（DOM）的化学和结构性质，并量化DOM对of在土壤上的吸附的影响。 DOM样品是从在0、21、63和180 d孵育的微观世界获得的。将大量DOM样品分为四个部分：亲水物质（HIM），酸不溶物（AIM），疏水性酸（HOA）和疏水性中性（HON）组分。本体DOM和四个DOM组分的特征在于其元素组成和功能。结果表明，HIM的H / C原子比最高，而HOA和AIM的H / C原子比最低。这些DOM样品在初始水溶液中用作背景DOM，用于测量of在稻田土壤上的吸附。结果表明，在四个DOM组分中，HOA，HON和AIM显着降低了pyr的吸附系数，但HIM对土壤中的吸附几乎没有影响。极性较小的AIM和HON似乎对水中的pyr具有更强的结合亲和力，从而降低了对土壤的吸附系数，而极性较大且芳香性较低的HIM对水中的pyr具有更弱的结合亲和力，对the几乎没有影响或没有影响。被土壤吸收。本研究表明，稻草来源的DOM可能会增强土壤-水系统中有机污染物的解吸和传输。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第9期|P.1967-1975|共9页
  • 作者

    Jiangmin Zhou; Hualin Chen; Weilin Huang;

  • 作者单位

    School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, Zhejiang, China;

    rnSchool of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, Zhejiang, China;

    Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901 -8551, USA;

  • 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
  • 关键词

    dissolved organic matter; heterogeneity; elemental composition; pyrene sorption;

    机译：溶解的有机物异质性元素组成pyr吸附;

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