Is the theory to form trihalomethane by chlorination of aquatic humic substances truth?

存在于自来水中的三卤代甲烷(THM)被认为是由水中腐殖质(HS)作为氯处理水的前体而形成的。然而，关于水生HS与环境水中THM生成潜力之间关系的研究报道甚少。HS是由腐烂的植物组织及其分解产物化学或生物合成的环境中的难降解有机物质。另一方面，天然水含有非腐殖质(非HS)，属于已知的生物化学类别。它们可能含有生物有机体合成的大部分生化化合物。非HS被作为混合物处理，因为它们的化学规格很难确定。非HS的氯化比HS的氯化更适合THM的形成，而HS的氯化是耐火的。这项研究的目的是利用从天然水中分离出来的HS来估计HS对三氢甲烷生成势的贡献。Water…从麒麟、Uji、Katsura和Yodo River采集了更多的样品，并用DAX-8树脂柱将其分为疏水性酸(HS)、疏水性中性组分和亲水性组分。在此条件下，对天然水样和各馏分进行氯化处理，以估算THM的生成潜力。用气相色谱-质谱法测定了含氯处理水样的反应瓶顶空中THMS的浓度。黄腐酸(FA)是水生HS的主要成分，天然水氯化生成的THM大部分为三氯甲烷。考察的天然水的三氯甲烷生成势为13~22μg/L，与原水相比，三氯甲烷生成势的贡献率为15%~24%。天然水中FA的含量为13-28%。因此，天然水氯化制备的THMS的主要前驱体为非HS。非HS的亲水酸将占据THMS前体的较大部分。较少

Trihalomethane(THM) which exists in tap water is thought to be formed from aquatic humic substances(HS) as a precursor during water treatment with chlorine. However, few studies about the relationship between aquatic HS and the THM formation potential in environmental water have been reported. HS are refractory organic substances in environment chemically or biologically synthesized from decayed plant tissues and their decomposition product. On the other hand, natural water contains non-humic substances (non-HS) which belong to known classes of biochemistry. They probably contain most of the biochemical compounds synthesized by living organisms. Non-HS are handled as a mixture because their chemical specifications are difficult. Chlorination of non-HS is more suitable for the formation of THM than the chlorination of HS which are refractory. The purpose of this study is to estimate the contribution of HS against the THM formation potential using the HS isolated from natural water.Water … More samples were collected from Kizu, Uji, Katsura, and Yodo River, and separated into 4 fractions ; that are hydrophobic acid (HS), hydrophobic neutral, and hydrophilic fraction, with a column of DAX-8 resin. A chlorination was performed for natural water samples and each fractions under the condition to estimate the THM formation potential. The concentrations of THMs in headspace of reaction bottle contained chlorine-treated water sample were determined by GC-MS.The fulvic acd(FA) was major part of aquatic HS and most of the THM made by chlorination of natural water was chloroform. Chloroform formation potential of investigated natural water was 13-22 μg/L. The contribution of FA was 15-24% as a result of comparing THM formation potentials between the FA and original water. The existence of FA in natural water was 13-28%. Therefore, the main precursor of THMs made by chlorination of natural water is non-HS. Hydrophilic acid of the non-HS would take the greater part of the precursor of THMs. Less