权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

水生腐殖质氯化形成三卤甲烷的理论正确吗？

基本信息

批准号：
15600004
负责人：
YONEBAYASHI Koyo
金额：
$ 1.92万
依托单位：
Kyoto Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15600004/
关键词：
trihalomethane humic substances non-humic substances fulvic acd chloroform DAX-8 resin

项目摘要

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

自来水中存在的三卤甲烷（THM）被认为是由水生腐殖物质（HS）在氯处理水时作为前体形成的。然而，关于水生HS与环境水体中THM形成潜力之间关系的研究报道较少。HS是环境中的难降解有机物质，由腐烂的植物组织及其分解产物通过化学或生物合成。另一方面，天然水含有属于已知生物化学类别的非腐殖物质（非HS）。它们可能含有生物体合成的大部分生化化合物。非协调制度的化学品作为混合物处理，因为它们的化学规格很难确定。非HS的氯化比难降解的HS的氯化更适合于THM的形成。本研究的目的是使用从天然水中分离的HS来估计HS对THM形成潜力的贡献。水 ...更多信息从Kizu、Uji、Kataku和Yodo River采集样品，并用DAX-8树脂柱将其分离成4个级分;即疏水酸（HS）、疏水中性和亲水级分。在此条件下，对天然水样和各组分进行氯化，以估计THM的形成潜力。用GC-MS法测定了含氯水样反应瓶中顶空三卤甲烷的浓度，结果表明，富里酸（FA）是水生HS的主要组成部分，天然水氯化产生的三卤甲烷主要是氯仿。天然水体氯仿生成潜力为13-22 μg/L。比较FA与原水之间的THM形成潜力，FA的贡献为15-24%。天然水体中FA的含量为13- 28%。因此，天然水氯化生成THMs的主要前体是非HS。三卤甲烷的前体主要是非HS的亲水酸。少