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A simple and sensitive method for determining magnesium in silicates low in aluminium and iron (glass, clay, feldspars, etc.) is presented. The method is applicable in the classical procedure of silicate analysis and magnesia is determined with Eriochrome Cyanine R in an ammonium buffer solution at pH 11.5. There is no interference by elements likely to occur in such samples. The accuracy and the precision of the proposed method are superior to those of the complexometric method. The limit of detection is 0.007% MgO.
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