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IonChromatographynews is a dedicated news and application resource for laboratory scientists utilizing ion chromatography applications.


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Determination of Sulfate and Chloride in Bioethanol by Ion Chromatography
21 Oct 2009 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 «packed-bed» suppressor as a suitable test method. ASTM D 7319-07 is the method of choice 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. The total inorganic sulfate content in bioethanol can also be determined by potentiometric titration (ASTM D 7318-07). Metrohm provides the sup...
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