Rapid Determination of Fluorine, Sulfur, Chlorine, and Bromine in Catalysts with Induction Furnace

Rapid combustion method for determination of sulfur in lead dioxide candles exposed to atmospheric pollution

“…The two elements are present as trace impurities in lead dioxide and have negligible effect on the iodometric titration. If the exposure conditions are such that large amounts of chlorine and nitrogen are present in the candle material, modified titration procedures are available to prevent interference (Conrad, Evans, et al, 1959;Nagel, 1960). Interference due to nitro- gen and chlorine becomes evident from the intensification of blue color of starch solution in the titration vessel (left-ward swing of galvanometer needle of the titrator from its initial setting), before the normal fading due to sulfur dioxide begins.…”

Determination of Platinum, Sulfur, and Chlorine in Platinum Reforming Catalysts

“…When an induction furnace was used for burning reforming catalysts, the volatility of platinum was again observed. Attempts to determine sulfur dioxide iodometrically following the Leco procedure (4) failed. Excessively high titrations led to the conclusion that some interfering element was consuming iodate.…”