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DIN EN 14538:2006
Fat and oil derivatives - Fatty acid methyl ester (FAME) - Determination of Ca, K, Mg and Na content by optical emission spectral analysis with inductively coupled plasma (ICP OES); German version EN 14538:2006
A procedure for the direct determination of the soap building elements Calcium (Ca) and Magnesium (Mg) in FAME by ICP OES at levels of about 1mg/kg to 10 mg/kg.
Deutsches Institut für Normung [din]