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

自来水中存在的三卤甲烷（THM）被认为是在用氯处理水时由水生腐殖质（HS）作为前体形成的。然而，关于水生HS与环境水体中THM形成势之间关系的研究报道较少。HS是由腐烂的植物组织及其分解产物在环境中化学或生物合成的难降解有机物。另一方面，天然水含有非腐殖质物质（non-HS），属于已知的生物化学类别。它们可能包含了生物体合成的大部分生化化合物。非hs作为混合物处理，因为它们的化学规格是困难的。非HS的氯化反应比难熔HS的氯化反应更适合于THM的形成。本研究的目的是利用从天然水中分离出的HS来估计HS对THM地层潜力的贡献。水：多采木津河、宇治河、桂村河和幽田河，分为4个馏分；分别为疏水酸（HS）、疏水中性和亲水性馏分，色谱柱为DAX-8树脂。在此条件下，对天然水样和各馏分进行了氯化处理，以估计THM的形成潜力。采用气相色谱-质谱法测定氯处理水样反应瓶顶空中THMs的浓度。黄腐酸（FA）是水生HS的主要组成部分，天然水体氯化产生的THM以氯仿为主。天然水体氯仿生成电位为13 ~ 22 μg/L。通过比较FA与原始水的THM形成势，FA对THM的贡献为15-24%。天然水体中FA的存在率为13-28%。因此，天然水氯化法制备THMs的主要前体是非hs。非hs的亲水性酸会占据THMs前体的大部分。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