TITLE

Indirect determination of chloride and sulfate ions in alcohol fuel by capillary electrophoresis

AUTHOR(S)
Pereira, Elisabete A.; Stevanato, Alessandra; Cardoso, Arnaldo A.; Tavares, Marina F. M.
PUB. DATE
September 2004
SOURCE
Analytical & Bioanalytical Chemistry;Sep2004, Vol. 380 Issue 1, p178
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A capillary zone electrophoresis method using indirect UV detection for the analysis of chloride and sulfate in alcohol fuel samples was developed. The anions were analyzed in less than 3 min using an electrolyte containing 10 mmol 1-1 chromate and 0.75 mmol 1-1 hexamethonium bromide (HMB) as electroosmotic flow modifier. Coefficients of variation were better than 0.6% for migration time (n = 10) and between 2.05 and 2.82% for peak area repeatabilities. Analytical curves of peak area versus concentration in the range of 0.065– 0.65 mg kg-1 for chloride and 0.25–4.0 mg kg-1 for sulfate were linear with coefficients of correlation higher than 0.9996. The limits of detection for sulfate and chloride were 0.033 and 0.041 mg kg-1, respectively. Recovery values ranged from 85 to 103%. The method was successfully applied for the quantification of sulfate and chloride in five alcohol fuel samples. The concentration of sulfate varied from 0.45 to 3.12 mg kg-1 Chloride concentrations were below the method's LOD.
ACCESSION #
14392585

 

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