因为单一指示剂,其变色范围一般都比较宽,有的在变色过程中还出现难以辨别的过渡色。在某些酸碱滴定中,为了达到一定的准确度,需要将滴定终点限制在较窄小的PH范围内(例如对弱酸或弱碱的滴定),可采用混合指示剂。
指示剂(indicator) Mixed indicator(混合指示剂):良好之指示剂必需是于碱与酸中有明显之对比,而 且颜色之变化很 sharp,但有些指示剂没有敏锐之变色,因此使用混合指示剂增加其...
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混合指示剂两相滴定 mixed indicator two phases titration
Single indicator was deficited in colour change and sensitivity, so optimized the mixed indicator.
单一指示剂存在变色pH范围过宽,或变色不够灵敏等缺点,因此优化了混合指示剂。
参考来源 - 啤酒有害产酸细菌选择性培养基的优化·2,447,543篇论文数据,部分数据来源于NoteExpress
研究了混合指示剂法对复合微肥中钼的测定,测定终点颜色变化明显。
According to the study of determination of molybdenum in compound micro-fertilizer by means of mix indicator technique, it was found that change of terminal colour of titration is clear.
应用于EDTA滴定钙镁时,该探头能灵敏地响应酸性铬蓝K萘酚绿B混合指示剂的颜色变化,从而实现了自动光度滴定。
The photometric probe is sensitive to the color change of acid chrome K and naphthol green B mixed indicator when Ca 2+ and Mg 2+ are titrated with EDTA.
结果表明,对化妆品成份过敏者中,大部分是对其中香料过敏,混合香料作过敏指示剂较秘鲁香脂更接近实际。
It is concluded that fragrance contact allergy accounted for great majority of patients reacting to cosmetics and fragrance mix was superior to Balsam of Peru.
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