Factors influencing the photodegradation of Nnitrosodimethylamine in drinking water  

作　　者：Bingbing XU Zhonglin CHEN Fei QI Jimin SHEN Fengchang WU 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China [2]State Environmental Protection Key Laboratory for Lake Pollution Control,Chinese Research Academy of Environmental Sciences,Beijing 100012,China [3]College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China

出　　处：《Frontiers of Environmental Science & Engineering》2009年第1期91-97,共7页环境科学与工程前沿（英文）

基　　金：This work was supported the National High Technology Research and Development Program of China(Grant No.2007AA06Z339);the National Natural Science Foundation of China(Grant No.50578052);the National Basic Research Program of China(2008CB418200).

摘　　要：In order to provide basic data for practical application,photodegradation experiment of Nnitrosodimethylamine(NDMA)in aqueous solution was carried out with a low-pressure Hg lamp.Effects of the initial concentration of NDMA,solution pH,dissolved oxygen,and the presence of humic acid on NDMA photodegradation were investigated.NDMA at various initial concentrations selected in this study was almost completely photodegraded by UV irradiation within 20 min,except that at 1.07 mmol/L,NDMA could be photodegraded almost completely in the acidic and neutral solutions,while the removal efficiency decreased remarkably in the alkaline solution.Dissolved oxygen enhanced the NDMA photodegradation,and the presence of humic acid inhibited the degradation of NDMA.Depending on the initial concentration of NDMA,NDMA photodegradation by UV obeyed the pseudo-first-order kinetics.Dimethylamine,nitrite,and nitrate were detected as the photodegradation products of NDMA.^(1)O_(2) was found to be the reactive oxygen species present in the NDMA photodegradation process by UV,based on the inhibiting experiments using tert-butanol and sodium azide.

关 键 词：N-nitrosodimethylamine(NDMA) ultraviolet irradiation degradation kinetic DIMETHYLAMINE photodegradation product 

分 类 号：TS2[轻工技术与工程—食品科学与工程]