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Characterisation of Carbonyl Byproducts of Drinking Water Ozonation

机译:饮用水臭氧化羰基副产物的表征

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Ozone treatment of drinking waters has been applied for a range of purposes including taste and odour control, inactivation of protozoan parasites, degradation of cyanotoxins, 'enhanced coagulation', 'enhanced biodegradation' and oxidative degradation of recalcitrant organics. Molecular ozone reacts at unsaturated sites of natural organic matter (NOM) to produce smaller oxygenated molecules including carbonyl compounds such as aldehydes, ketones, and carboxylic acids. The elucidation of the nature and precise identity of these ozonation by-products is hindered by two complicating factors. The first is the inherent aqueous solubility of many of these compounds, which renders their efficient extraction from water difficult to achieve. Second is the lack of established identity of specific potential by-products, which complicates targeted analytical approaches. To address these challenges, we have approached the task of by-product identification by methods involving aqueous functional group-specific derivatisation reactions. A range of carbonyl byproducts were identified during laboratory-scale testing. These ranged in size from formaldehyde up to 7-carbon species with multiple carbonyl and hydroxyl functional groups.
机译:饮用水的臭氧处理已用于多种目的,包括控制味道和气味,灭活原生动物寄生虫,降解氰毒素,“增强混凝”,“增强生物降解”和难降解有机物的氧化降解。分子臭氧在天然有机物(NOM)的不饱和位置发生反应,生成较小的含氧分子,包括羰基化合物,例如醛,酮和羧酸。这些臭氧化副产物的性质和精确身份的阐明受到两个复杂因素的阻碍。首先是许多这些化合物固有的水溶性,这使得它们难以有效地从水中提取。其次是缺乏对特定潜在副产物的确定性,这使目标分析方法变得复杂。为了解决这些挑战,我们已经通过涉及水性官能团特异性衍生化反应的方法来完成副产物鉴定的任务。在实验室规模的测试中发现了一系列羰基副产物。这些化合物的大小从甲醛到具有多个羰基和羟基官能团的7个碳原子不等。

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