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Trihalomethane formation potential of DOC fractions isolated from two Canadian Prairie surface water sources

机译：从两个加拿大草原地表水源中分离出的DOC馏分的三卤甲烷形成潜力

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This study evaluated the dissolved organic carbon (DOC) composition of two surface waters in Manitoba, Canada, the Red and Assiniboine Rivers, to identify DOC fractions with the greatest potential to form trihalomethanes (THMs). The DOC was fractionated into six fractions based on hydrophobicity and acid base functionality: hydrophobic acid (HPOA), hydrophobic base (HPOB), hydrophobic neutral (HPON), hydrophilic acid (HPIA), hydrophilic base (HPIB), and hydrophilic neutral (HPIN). The trihalomethane formation potential (THMFP) of the isolated fractions was measured. Fractions collected from the Red River showed significant variation in the specific THMFP, normalized to DOC concentration, ranging from 23 to 1,372 μg THM/mg DOC, while the Assiniboine River THMFP ranged from 11 to 575 μg THM/mg DOC. Although the DOC composition of the two rivers was similar, the THMFP for the fractions differed significantly. The Red River HPOB and HPIB fractions had the highest normalized THMFP of 1,002 μg THM/mg DOC and 1,372 μg THM/mg DOC, respectively, while the HPOA fraction showed the lowest with 23 μg THM/mg DOC. Comparatively, the HPOA fraction from the Assiniboine River was found to have a higher specific THMFP of 478μg THM/mg DOC. These findings suggest that THM formation is dependent on unique organic composition of the local water and that caution should be taken when estimating THMFP from DOC fractions isolated from different water sources.
机译：这项研究评估了加拿大曼尼托巴省，红河和阿西尼博因河中两个地表水的溶解有机碳（DOC）组成，以鉴定最有可能形成三卤甲烷（THMs）的DOC馏分。根据疏水性和酸碱官能度将DOC分为六部分：疏水酸（HPOA），疏水性碱（HPOB），疏水性中性（HPON），亲水性酸（HPIA），亲水性碱（HPIB）和亲水性中性（HPIN） ）。测量了分离出的馏分的三卤甲烷形成潜力（THMFP）。从红河收集的馏分显示特定THMFP的显着变化，已标准化为DOC浓度，范围为23至1,372μgTHM / mg DOC，而Assiniboine River THMFP为11至575μgTHM / mg DOC。尽管两条河流的DOC组成相似，但各部分的THMFP差异很大。 Red River HPOB和HPIB馏分的标准化THMFP最高，分别为1,002μgTHM / mg DOC和1,372μgTHM / mg DOC，而HPOA馏分的最低归一化THMFP为23μgTHM / mg DOC。相比之下，发现来自阿西尼博因河的HPOA馏分具有更高的比重THMFP，为478μgTHM / mg DOC。这些发现表明，THM的形成取决于当地水的独特有机组成，因此，从不同水源中分离出的DOC馏分估算THMFP时应格外小心。

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