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ISO 9062:1992 Acid-grade and ceramic-grade fluorspar -- Determination of manganese content -- Periodate spectrometric method
standard by International Organization for Standardization, 12/01/1992
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Applicable to products having Mn-contents in the range 0,006 % to 0,4 %. Decomposition of the test portion with nitric and perchloric acids. After dilution follows oxidation of manganese to permanganate with sodium metaperiodate. Spectrometric measurement at 545 nm.