Determination of Sulfate and Chloride in Bioethanol by Ion Chromatography

摘要

The US norm ASTM D 4806 defines the quality requirements for denatured ethanol used in fuels. Recently, a new specification concerning the permitted sulfate and chloride content has been added. ASTM D 7319-07 recommends ion chromatography with direct injection using a conductivity detector with > suppressor as a suitable test method. The method is suitable for the determination of the potential sulfate content or total sulfate content from 1.0 to 20 mg/kg and a total chloride content from 1.0 to 50 mg/k (ASTM D 7318). A second ion chromatography method exists (ASTM D 7328-07e1), but is more complicated to carry out and is also more error-prone.