Determination of the absolute mobility and the equivalent ionic conductivity of NpO2+ at 25 °C and at infinite dilution by capillary electrophoresis -: inductively coupled plasma-mass spectrometry

The absolute mobility of NpO2+ and its equivalent ionic conductivity were extrapolated at 25 degreesC and at infinite dilution using a set of experimental data obtained at various ionic strengths. The separation was carried out by capillary electrophoresis (CE) at various concentrations of creatinine at a pH of 5. The detection of NpO2+ was performed by inductively coupled plasma mass spectrometry coupled on-line with CE. The following values have been found: mu(NpO2+)(0)(25 degreesC)=(2.94+/-0.07)(.)10(-4) cm(2) V-1 s(-1) and Lambda(NpO2+)(0)(X 10(4), 25 degreesC) = 28.3+/-0.7 m(2) S mol(-1). (C) 2003 Elsevier Science B.V. All rights reserved.