Drinking Water Engineering and Science Discussions www.drink-water-eng-sci-discuss.net 1996-9473 1996-9481 2 1 2009 10.5194/dwesd-2-79-2009 http://www.drink-water-eng-sci-discuss.net/2/79/2009/ http://www.drink-water-eng-sci-discuss.net/2/79/2009/dwesd-2-79-2009.html http://www.drink-water-eng-sci-discuss.net/2/79/2009/dwesd-2-79-2009.pdf 79 100 2009-03-31 Removal of radio <i>N</i>-nitrosodimethylamine (NDMA) from drinking water by coagulation and Powdered Activated Carbon (PAC) adsorption J. Chung Y. Yoon M. Kim moonilkim@hanyang.ac.kr S.-B. Lee H.-J. Kim C.-K. Choi R&D Center, Samsung Engineering Co. Ltd., 415-10 Woncheon-Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, 443-823, Korea Department of Civil and Environmental Engineering, University of South Carolina, Columbia, SC 29208, USA Department of Civil and Environmental System Engineering, Hanyang University, 1271 Sa-1 Dong, Ansan, Gyeonggi-Do, 425-791, Korea The presence of <i>N</i>-nitrosodimethylamine (NDMA) in drinking water supplies has raised concern over its removal by common drinking water treatment processes. A simple detection method based on scintillation spectroscopy has been used to quantify the concentration of ¹⁴C-labeled NDMA at various ratios of sample to scintillation liquid. Without sample pretreatment, the method detection limits are 0.91, 0.98, 1.23, and 1.45 ng/L of NDMA at scintillation intensity ratios of 10:10, 5:15, 15:5, and 2.5:17.5 (sample: scintillation liquid), respectively. The scintillation intensity in all cases is linear (<i>R</i>²>0.99) and is in the range of 0 to 100 ng/L of NDMA. 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