Determination of molybdenum-stannous chloride reduction thiocyanate rapid spectrophotometry I. Main reagents: 1. Perchloric acid: (concentrated) 2. Hydrochloric acid: (concentrated) 3. Mixed tin chloride-hydrochloric acid solution: Yu Sheng In 500 ml of 20 ml of concentrated hydrochloric acid, 6 g of stannous chloride was added, after dissolution, 280 ml of water was added, and then 6 g of sodium thiocyanate was added, and dissolved by stirring. 4. Blank solution: Add 6 grams of stannous chloride to 20 ml of hydrochloric acid, add 280 ml of water after dissolving, and stir well.
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