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Manganese present in commercial gasolines as (methylcyclopentadieny1)-manganese tricarbonyl (AK-33X) can be determined spectrophotometrically as permanganate. The manganese compound is decomposed using a solution of bromine in carbon tetrachloride. The manganese is extracted with phosphoric acid, and a mixture of nitric and phosphoric acids is added to oxidize the organic material in the extract. The permanganate is formed by periodate oxidation. Various gasoline base stocks and additives used do not interfere. As many as 3 2 determinations can be made per man-day. The accuracy is within 2% of the true value.

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