Cathodic adsorptive stripping voltammetric determination of trace amounts of uranium (VI) based on its complex with Chromazorul-S.
An adsorptive stripping voltammetric procedure for trace determination of uranium (U; VI) at a hanging mercury drop electrode is described. The complex of U(VI) with Chromazorul-S was adsorbed and accumulated from an ammonia buffer solution of pH 8.8, including 2.4 x 10(-5) M Chromazorul-S at the potential -0.2 V for 120 s. After that, the cathodic voltammograms were recorded by potential sweep from -0.2 to -0.9 V in the differential pulse mode. The relationship between the cathodic peak currents versus U(VI) concentrations was linear over the range of 0.7-340 ng/mL. The detection limit was 0.1 ng/mL, and the relative standard deviations (7 determinations) at 10, 100, and 300 ng/mL U(VI) were 2.1, 1.6, and 1.1%, respectively. The validity of this method was estimated by determination of spiked U(VI) in natural water and soil samples. The results were successful.
Mohadesi
Alireza
A
Payame Noor University, Department of Chemistry, Kerman, Iran. mohadesi_a@yahoo.com
Hosseinzadeh
Laleh
L
Abbasi
Shahriar
S
Esfandyarpour
Mohammad
M
D000327:Adsorption; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D062385:Hydroxybenzoates / Q000737:chemistry*; D015203:Reproducibility of Results; D012987:Soil / Q000032:analysis; D014501:Uranium / Q000032:analysis*; D014867:Water / Q000032:analysis
D062385:Hydroxybenzoates; D012987:Soil; D014867:Water; C015076:chrome azurol S; D014501:Uranium