重铬酸钾容量法测定铁矿石中全铁的方法改进  

An Improved Method for Potassium Dichromate Determination of Total Iron in Iron Ore

作　　者：陈占生[1] 杨理勤[1] 谢璐[1] 李玄辉[1] 

机构地区：[1]中国人民武装警察部队黄金地质研究所,河北廊坊065000

出　　处：《中国无机分析化学》2015年第3期41-44,共4页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：选用三氯化钛-重铬酸钾-中性红指示剂容量法,通过对方法的改进,对温度、溶样酸、酸介质、指示剂及共存离子消除的不同条件实验的对比研究,优化了无汞测定全铁的分析方法,实验表明,方法的相对标准偏差(RSD)为0.16%,对国家标准物质测定结果与推荐值基本一致,参加中实国金比对Z比分数小于2,测定结果满意。A titanium trichloride-potassium dichromate-neutral red indicator method was proposed in this paper. Experimental parameters, such as temperature, solution acid, acid medium, indicator and coexisting ions interference elimination were studied, and the method for the determination of total iron without mercury was optimized. The results showed that the relatives standard deviation （RSD）was 0.16%, and the measured values of total iron of the national standard materials were consistent with the recommended values. The method was validated by the analysis of total iron for proficiency testing （China NIL Research Center for Proficiency Testing） with satisfactory results.

关 键 词：铁矿石 全铁 重铬酸钾法 

分 类 号：O655.2[理学—分析化学]