ENVR 111 |
| Several nitrosamines including N-diphenylnitrosamine (NDPhA) were detected using the solid phase extraction (SPE) with high performance liquid chromatography mass spectrometry (HPLC/MS/MS) technique in a water system in our previous study. There is no information on the occurrence of NDPhA in different water systems. In the present study, we used the SPE-HPLC/MS/MS method to investigate the occurrence of nine nitrosamines, N-nitrosodimethylamine (NDMA), N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPyr), N-nitrosopiperidine (NPip), N-nitrosomorpholine (NMor), N-nitrosodiethylamine (NDEA), N-nitrosodi-n-propylamine (NDPA), N-nitrosodi-n-butylamine (NDBA) and N-nitrosodiphenylamine (NDPhA) in five drinking water systems in Alberta, Canada. These systems provide drinking water for a majority of the population in Alberta. Water samples including source water, treated water and distribution water were collected from the five drinking water systems. All facilities surveyed use chlorinated or chloraminated disinfection. The results showed that the concentration of NDMA detected was the highest with the highest frequency among the nine nitrosamines. The concentration of NDMA increased with the distance from the treatment plant in all distribution systems investigated. The concentration of NDMA was found to be up to 200 ng/L and NDPhA was detected in two systems. In the system that we previously studied, the concentration of NDPhA increased with the increase of distribution distance and then decreased again. These results are consistent with the findings in our previous study, confirming the occurrence of NDPhA in this system. |
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Advances in Drinking Water Disinfection and Disinfection Byproduct Management
8:30 AM-12:10 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 236, Oral
Division of Environmental Chemistry |