2078 ´ 1,2 Jorge Saiz Thanh Duc Mai3,4 Peter C Hauser3 Carmen Garc´ıa-Ruiz1,2 Department of Analytical Chemistry, Multipurpose Building of Chemistry, ´ Alcala´ de University of Alcala, Henares, Madrid, Spain University Institute of Research in Police Sciences (IUICP), ´ Alcala´ de University of Alcala, Henares, Madrid, Spain Department of Chemistry, University of Basel, Basel, Switzerland Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Hanoi, Vietnam Received January 30, 2013 Revised May 10, 2013 Accepted May 10, 2013 Electrophoresis 2013, 34, 2078–2084 Research Article Determination of nitrogen mustard degradation products in water samples using a portable capillary electrophoresis instrument In this work, a new purpose-made portable CE instrument with a contactless conductivity detector was used for the determination of degradation products of nitrogen mustards in different water samples The capillary was coated with poly(1-vinylpyrrolidone-co-2dimethylaminoethyl methacrylate) to avoid analyte-wall interactions The coating procedure was studied to obtain the best repeatability of the migration time of the analytes Four different coating procedures were compared; flushing the capillary with the copolymer at 100 psi for at 60ЊC provided the best RSD values (