Uranyl ion-selective optical test strip

摘要

A novel, optical sensor, test strip has been developed for the spectrophotometric determination of trace amounts of uranyl ions, UO_2~(2+), based on immobilization of C.I. Mordant Blue 29 (Chromazurol S)/cetyl N,N,N-trimethyl ammonium bromide ion pair on a triacetyl cellulose membrane. Optimization of the sensor for the detection of low levels of uranyl ion is described. The test strip responded linearly to uranyl ions between 3.0 x 10~(-7) and 6.0 x 10~(-5) mol L~(-1); the reproducibility of the sensor at a medium level of UO_2~(2+) activity was ±0.55%. The optical sensor can be regenerated using 0.01 mol L~(-1) HCl or 0.01 mol L~(-1) NaF solution after 10min. The developed test strip was used in the determination of UO_2~(2+) in ground water samples.