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本法用硅钼黄作指示剂,用二氯化锡还原三价为二价铁,二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定之。
This method uses silicon molybdenum yellow as an indicator, using tin dichloride reduction trivalent iron, sodium diphenylamine sulfonate as an indicator, titration with potassium dichromate standard solution.