title: Monthly survey of N-nitrosamine yield in a conventional water treatment plant in North China.
abstract: A sampling campaign was conducted monthly to investigate the occurrence of N-nitrosamines at a conventional water treatment plant in one city in North China. The yield of N-nitrosamines in the treated water indicated precursors changed greatly after the source water switching. Average concentrations of N-nitrosodimethylamine (NDMA), N-nitrosomorpholine (NMOR), and N-nitrosopyrrolidine (NPYR) in the finished water were 6.9, 3.3, and 3.1ng/L, respectively, from June to October when the Luan River water was used as source water, while those of NDMA, N-nitrosomethylethylamine (NMEA), and NPYR in the finished water were 10.1, 4.9, and 4.7ng/L, respectively, from November to next April when the Yellow River was used. NDMA concentration in the finished water was frequently over the 10ng/L, i.e., the notification level of California, USA, which indicated a considerable threat to public health. Weak correlations were observed between N-nitrosamine yield and typical water quality parameters except for the dissolved organic nitrogen.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Chengkun
authors.initials: C
authors.lastname: Wang
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Shuming
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Xiaojian
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China; State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing 100084, China. Electronic address: chen_water@tsinghua.edu.cn.
authors.forename: Chao
authors.initials: C
authors.lastname: Chen
mesh_terms: D002681:China; D004128:Dimethylnitrosamine / Q000031:analogs & derivatives / Q000032:analysis; D009602:Nitrosamines / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification
chemical_list: D009602:Nitrosamines; D014874:Water Pollutants, Chemical; C017510:methylethylnitrosamine; C002741:N-nitrosomorpholine; D004128:Dimethylnitrosamine
keywords: Correlation; Dissolved organic nitrogen; Fluorescence excitation–emission matrix; Molecule weight; N-nitrosamines; Precursors