Monthly survey of N-nitrosamine yield in a conventional water treatment plant in North China |
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Authors: | Chengkun Wang Shuming Liu Jun Wang Xiaojian Zhang Chao Chen |
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Affiliation: | 1 School of Environment, Tsinghua University, Beijing 100084, China;2 State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing 100084, China |
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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 3.1 ng/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 4.7 ng/L, respectively, from November to next April when the Yellow River was used. NDMA concentration in the finished water was frequently over the 10 ng/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. |
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Keywords: | N-nitrosamines Precursors Fluorescence excitation&ndash emission matrix Dissolved organic nitrogen Molecule weight Correlation |
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