Sulphate Content of Ethanol Analysis to ASTM D 4806-06c

An important quality criterion for biofuel analysis is the sulphate content of ethanol, because sulphates form deposits in the engine and may contribute to sulphuric acid emissions. This quality parameter is easily determined by titration with Metrohm’s (Switzerland) 809 Titrando with a Pb2+ crystal membrane Ion Selective Electrode as the indicator electrode, the system being controlled by the tiamo software.

This titration is based on the precipitation of lead sulphate, whereby the equivalence point Pb2+ crystal membrane Ion Selective Electrode. This method is performed with Metrohm equipment fulfils the requirements of international standardised test procedures as mentioned in the new ASTM D4806-06c at the highest level of quality.