Avaliação de contaminantes inorgânicos e orgânicos em álcool combustível utilizando eletroforese capilar

Abstract

This work reports the analysis of inorganic and organic contaminants in alcohol fuel samples using capillary electrophoresis. Chloride and sulfate were analyzed in nitrate/ monochloroacetic acid at 10 mmol L -1 concentration each under indirect UV detection (210 nm). The analysis of aldehydes is based on the 216 nm detection of 3-methyl-2-benzothiazoline hydrazone adducts. The running buffer consisted of 20 mmol L -1 tetraborate, 40 mmol L -1 sodium dodecyl sufate and 12 mmol L-1 β-ciclodextrin. Both methodologies were applied to real samples indicating inorganic ion concentrations from 0.15 to 6.64 mg kg -1 and aldehydes from 32.0 to 91.3 mg L -1.