ISSN:
1436-5073
Keywords:
glass analysis
;
cobalt determination
;
chromium determination
;
ion chromatography
;
chemiluminescence
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A method is described for the simultaneous determination of very low levels of Co and Cr by high performance ion chromatography coupled with a chemiluminescence detection system. 0.1M K2SO4 solutions, adjusted to pH 3.0, were used as eluent to separate Co(II) and Cr(III) between them and from interferents. The detection system was the chemiluminescence of luminol/ H2O2 in alkaline medium catalyzed by such transition metals. Using a matrix solution analogous to soda-lime silica glass (dissolved in acids) calibration graphs were linear up to 0.5 ng ml−1 for cobalt and up to 250 ng ml−1 for chromium. The corresponding calculated detection limits (3 s) in such matrix were 0.05 ng ml−1 and 15 ng ml−1 for Co and Cr, respectively. The relative standard deviations were 1.4% at 0.5 ng ml−1 Co level and 2.8% at the 200 ng ml−1 Cr level. No interferences were observed from the more common metals, particularly those present in glass samples. The ion chromatography/ chemiluminescent method proposed has been successfully applied to the analysis of Co and Cr in glasses.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01242094
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