ISO 9062:1992

Acid-grade and ceramic-grade fluorspar — Determination of manganese content — Periodate spectrometric method

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.