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基于三酸消解-无汞滴定法测定铁矿石中的TFe

Xiu-jiu YANG,Wei-hong LIU,Feng YANG

Contemporary Chemical Industry（2017）

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Abstract
采用硫酸-磷酸-高氯酸混合酸分解样品,三氯化钛直接还原三价铁,硫酸铜催化消除钨蓝,避免了重铬酸钾氧化过量三氯化钛带来的误差,以二苯胺磺酸钠为指示剂,用重铬酸钾标准溶液滴定至终点.方法精密度(n=6)小于1.0％,测定结果与标准物质所提供的参考值一致,步骤简便,更适合实际样品的测定.
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