Notes on the determination of sulphate in denatured ethyl alcohol by direct-injection ion chromatography and sequential suppressed conductivity
Direct injection of the ethanol sample into the IC is the most effective way of analysing such samples for chloride and sulphate.
Using Metrohm instrumentation, namely the Metrohm Suppressor Module MSM, guarantees the lowest limits of determination says the company.
This report describes the determination applying a 861 Compact IC with sequential suppression.
The samples of an ASTM round-robin test have been analysed and the results have been reconfirmed by use of an MS detector.
The ruggedness and sensitivity depend to a large extent on the suppression system.
The Metrohm Suppressor Module (MSM) is absolutely inert and its performance is not affected by the sample.
ASTM has approved a new method on this item: ASTM D 7319 - 07, standard test method for determination of total and potential sulphate and inorganic chloride in fuel ethanol by direct injection suppressed ion chromatography.
In this standard the limit of quantitation for 'tri-chambered suppressor regeneration' (synonym for MSM) is ten times lower than for 'continuous suppressor membrane regeneration'.
