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首页> 外文期刊>Environmental Science & Technology >Dissolved Organic Nitrogen as a Precursor for Chloroform, Dichloroacetonitrile, N-Nitrosodimethylamine, and Trichloronitromethane
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Dissolved Organic Nitrogen as a Precursor for Chloroform, Dichloroacetonitrile, N-Nitrosodimethylamine, and Trichloronitromethane

机译：溶解的有机氮作为氯仿，二氯乙腈，N-亚硝基二甲胺和三氯硝基甲烷的前体

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Nitrogen-containing disinfection byproducts (N-DBPs) are potentially toxic. This study assessed the formation of three N-DBPs (dichloroacetonitrile (DCAN), trichloroni-tromethane (TCNM), and N-nitrosodimethylamine (NDMA)) and one regulated DBP (chloroform) upon adding free chlorine and monochloramine into solutions containing different fractions (hydrophobic, transphilic, hydrophilic, and colloidal) of dissolved organic matter (DOM) isolates (n = 17). We hypothesized that N-DBP formation would increase for organic matter enriched in organic nitrogen. Formation potential tests were conducted with free chlorine or preformed monochloramine. Chloramination formed, on average, 10 times lower chloroform concentrations, but 5 times higher DCAN concentrations, as compared with free chlorine addition. The formation of the two halogenated N-DBPs (DCAN and TCNM) increased as the dissolved organic carbon (DOC) to dissolved organic nitrogen (DON) ratio decreased upon adding free chlorine, but the N-DBP formation was relatively constant upon adding monochloramine. NDMA, a nonhalogenated N-DBP, formed on average 0.26 nmol per mg of DOC (4.5 nmol per mg of DON) upon adding monochloramine; no NDMA formation occurred upon adding free chlorine. NDMA formation increased as the DOC/DON ratio decreased (i.e., increasing nitrogen content of DOM). NDMA formation also increased as the amino sugar to aromatic ratio of DOM increased. The results support the hypothesis that DON promotes the formation of N-DBPs.
机译：含氮消毒副产物（N-DBP）有潜在毒性。这项研究通过将游离氯和一氯胺添加到含有不同馏分的溶液中，评估了三种N-DBP（二氯乙腈（DCAN），三氯硝基甲烷（TCNM）和N-亚硝基二甲胺（NDMA））和一种受管制DBP（氯仿）的形成（溶解的有机物（DOM）分离物（n = 17）的疏水，亲和，亲水和胶体。我们假设，富含有机氮的有机质会增加N-DBP的形成。用游离氯或预制的一氯胺进行了形成电势测试。与添加游离氯相比，氯化形成的氯仿浓度平均低10倍，但DCAN浓度高5倍。添加游离氯后，随着溶解有机碳（DOC）与溶解有机氮（DON）比例的降低，两个卤化N-DBP的形成增加（DCAN和TCNM），但添加一氯胺后，N-DBP的形成相对恒定。 NDMA是一种非卤代的N-DBP，在加入一氯胺后平均每毫克DOC形成0.26 nmol（每毫克DON 4.5 nmol）；加入游离氯后未发生NDMA形成。 NDMA的形成随着DOC / DON比值的降低而增加（即DOM中氮含量的增加）。 NDMA的形成也随着DOM的氨基糖与芳香族比率的增加而增加。结果支持了DON促进N-DBPs形成的假设。

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