内容 |
特集論文 |
巻 |
10巻2号2005年
|
Page |
44
|
題名 |
浄水プロセスにおけるNOMおよびフェノール性化合物の臭素化反応の速度論
|
Title |
Bromination Kinetics of Phenolic Compounds and NOM by Hypobromous Acid in Drinking Water Treatment |
著者 |
越後 信哉,ロジャー マイニーア |
Authors |
Shinya Echigo, Roger A. Minear |
著者表記 |
|
著者表記(英) |
|
著者勤務先名 |
京都大学大学院工学研究科都市社会工学専攻,イリノイ大学大学院土木環境工学科 |
Office name |
Department of Urban Management, Kyoto University,Department of Civil and Environmental Engineering, University of Illinois at Ur |
著者所属名 |
|
キーワード |
NOM, 臭化物イオン,次亜臭素酸,消毒副生成物,多段ストップフロー分析,臭素化 |
Key Words |
NOM, bromide, hypobromous acid, disinfection byproducts, sequential stopped-flow analysis, bromination |
概要 |
連続ストップ・フロー分析とABTS法を組み合わせ,中性付近でのフェノール性化合物とHOBrの反応速度を決定した。pH7における見かけの反応速度定数は330から600000 /Msの範囲にあった。さらにσ定数やフェノール性化合物とHOClとの反応性からHOBrとフェノール性化合物の反応性を予測できる可能性を示した。また,NOMとHOBrの初期反応についても速度論情報を効率よく収集する方法を確立した。 |
Abstract |
Kinetic information on the reactions between hypobromous acid (HOBr) and phenols and the reactions between HOBr and natural organic matter (NOM) was collected by sequential stopped-flow technique. The observed sec-ond-order rate constants of 15 phenols at pH7.0 ranged from 330 to 600000 /M s, indicating higher reac-tivity than other unsaturated organic compounds. The rate constants of the reactions between HOBr and 15 phenolates(k2'), the major reaction pathway in the common pH range in drinking water treatment practice, were corre-lated to Hammett’s sigma?values and k2’ for chlorination of phenols by HOCl. Multiple reaction phases were found during the reaction between HOBr and NOMs. The number of reaction sites for the fast reaction phase of NOM from three different sources ranged from 0.20 to 0.92 ?mole /mg C, and was linked to specific phenolic contents. Also, the ap-parent second-order rate constants for the initial reaction phase between HOBr and NOM were similar that of vanillin. |