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以邻菲罗啉－Ｆｅ２＋为指示剂，在酸性法测定高锰酸盐指数中，用为标定高锰酸钾标准溶液和测定水样时显示滴定终点，使所得结果更为确切。
Phenanthroline-Fe2 + as an indicator, in the acid method for the determination of permanganate index, for the calibration of potassium permanganate standard solution and determination of water samples showed titration end point, the result is more accurate.