Simultaneous determination of chromium(III) and chromium(VI) in aqueous solutions by ion chromatography and chemiluminescence detection.
A method for the simultaneous determination of chromium(iii) and chromium(vi) in a flow system based on chemiluminescence was developed. A Dionex cation-exchange guard column was used to separate chromium(iii) from chromium(vi), and chromium(vi) was reduced by potassium sulfite, whereupon both species were detected by use of the luminol-hydrogen peroxide chemiluminescence system. Linear calibration for both species was established over the concentration range 1-1000 micrograms l-1. The precision at the 20 micrograms l-1 level was 3.5% for chromium(iii) and 3.3% for chromium(vi), respectively. The detection limit was 0.5 micrograms l-1 for both species. Data were in agreement with Zeeman-effect background corrected atomic absorption spectrometry measurements.
Gammelgaard
B
B
Royal Danish School of Pharmacy, Copenhagen.
Jøns
O
O
Nielsen
B
B
D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D049449:Luminescence; D012996:Solutions; D014131:Trace Elements / Q000032:analysis*; D014867:Water / Q000032:analysis
D012996:Solutions; D014131:Trace Elements; D014867:Water; D002857:Chromium