Monday, August 13, 2012

AOCS Official Method Ea 6-51 Glycerol, Sodium Periodate Oxidation Method Reinstated

At the Uniform Methods Committee meeting held in conjunction with the 103rd AOCS Annual Meeting in Long Beach, CA, the Committee, at the request of the biodiesel sector, voted to reinstate AOCS Official Method Ea 6-51 Glycerol, Sodium Periodate Oxidation Method while maintaining AOCS Official Method Ea 6-94 Determination of Crude Glycerin, Titrimetic Method.

In more detail, Ea 6-51 is applicable to any glycerin solution, but particularly useful in analyses of samples containing oxidizable organic impurities and certain hydroxylated compounds which interfere with the dichromate and acetin procedures. Trimethylene glycol and other polyalcohols in which the hydroxyl groups are not adjacent do not react at room temperature. This method is not applicable to samples that contain, in addition to glycerol, polyhydric compounds with three or more adjacent hydroxyl groups, unless these compounds are removed prior to testing with the sodium periodate reagent. Whereas, Ea 6-94 is applicable to industrial glycerins. This method is not applicable in the presence of organic compounds containing more than two hydroxyl groups on adjacent carbon atoms, such as sugars. These compounds may also give rise to formic acid and will interfere in the glycerol determination.

For additional details, please contact technical@aocs.org.

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