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The Use of Pyrolysis GC/MS as a Single Analytical Tool for the Structural Characterization of NOM and the Identification of DBP Precursor Sites 使用热解GC/MS作为单一分析工具 对NOM进行结构表征 并识别DBP前体位置
发布日期: 2001-01-01
我们的工作目的是比较能够提供天然有机物(NOM)快速热解GC/MS的结构信息,以及使用其他相关方法(如13 C-NMR、元素分析、总溶解氨基酸和碳水化合物含量)确定的结构特征。这项工作是在65个疏水性和亲水性NOM组分上进行的,这些组分是使用XAD树脂分离法从原水和处理水中分离出来的。固态13C-NMR测定的NOM分子中结构单元的性质和相对丰度与基于热解色谱图某些特定峰的相对丰度建立的生物聚合物分布非常一致。元素分析、总溶解氨基酸和碳水化合物含量支持这一发现。与氯的反应结果表明,与三卤甲烷(THM)相比,NOM的亲水性部分(芳香度较低,但蛋白质和氨基糖含量较高)产生的卤乙酸(HAAs)产量显著高于三卤甲烷(THM),这与疏水性NOM的结果相反。 低分子量亲水性NOM组分中蛋白质的相对丰度与卤代乙腈的生成之间可以建立良好的关系。包括24个参考文献、表格和图表。
The objective of our work was to compare the structural information that can provide flash pyrolysis GC/MS on natural organic matter (NOM) and its structural characteristics established using other relevant methods such as 13 C-NMR, elemental analysis and total dissolved amino acid and carbohydrate content. This work was conducted on 65 hydrophobic and hydrophilic NOM fractions isolated from raw and treated waters using XAD resin isolation based protocols. The nature and relative abundance of structural units in the NOM molecules determined by solid state 13 C-NMR were in good agreement with the biopolymer distribution established based on the relative abundance of some specific peaks of the pyrochromatograms. Elemental analysis and total dissolved amino acids and carbohydrate contents support this finding. The results of the reactions with chlorine showed that the hydrophilic fractions of NOM (lower aromaticity but more enriched in proteins and aminosugars) produced significantly higher yields of haloacetic acids (HAAs) compared to trihalomethanes (THMs) that were counter to the results for hydrophobic NOM. A good relationship could be established between the relative abundance of proteins in the lower molecular weight hydrophilic NOM fractions and the production of haloacetonitriles. Includes 24 references, table, figures.
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发布单位或类别: 美国-美国给水工程协会
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