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 °C 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: μNpO2+0(25 °C)=(2.94±0.07)·10−4 cm2 V−1 s−1 and ΛNpO2+0 (×104, 25 °C)=28.3±0.7 m2 S mol−1.