Platinum in Fresh Platinum-Rhenium Catalysts by Spectrophotometry


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    1. Scope

    This method is for determining platinum in fresh gamma-alumina catalysts containing rhenium but not molybdenum. Elements that produce colored ions in the color-development step, such as rhenium, constitute a positive interference, however, compensation for these interfering elements is made with an isoamyl acetate extraction. Concentrations of silica up to approximately 150 ppm do not interfere.

    Citing ASTM Standards
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