Abstract
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.
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Analyst |
| Vol/bind | 117 |
| Udgave nummer | 3 |
| Sider (fra-til) | 637-40 |
| Antal sider | 4 |
| ISSN | 0003-2654 |
| Status | Udgivet - 1992 |