摘要
采用高压密封消解罐处理铁矿样品,在适宜的酸性条件下,以氟离子选择电极—格氏作图模式直接测定铁矿中氟。以氢氧化钠作为沉淀剂分离铁、钛和稀土元素,柠檬酸钠盐作离子强度剂稳定电位及消除Al^(3+),Ca^(2+),Mg^(2+)等离子干扰。试验了密封消解的条件,沉淀剂和离子强度剂的最佳用量,调试酸度方法。方法用于测定铁矿石中氟,相对标准偏差小于6.56%,加标回收率为94%～106%,分析结果与ISO标准方法结果吻合,可满足日常分析工作的需要。
By using of high-pressure airproofvessel to dissolve the sample of iron ore,the fluorine content in iron ore samples were determined by fluorinion selective electrode and Gran chart model. In this method,iron, titanium and rare earth were separated using sodium hydroxide as precipitator and the interferences from Al^3＋ , Ca^2＋ , Mg^2＋ etc. were eliminated using sodium citrate as total ionic strength adjustment buffer（TISAB）. The optimum conditions including airproof vessel digestion,the dosage of precipitator and TISAB, the method adjusting the pH of solution were tested. The method has been applied to determine the fluorine content in iron ore with the relative standard deviation of less than 6.56% ,and the recovery obtained by standard addition method of 94%-106%. The analytical results can be comparable with those obtained by international standard method （ISO 4694-1987）. This method is suitable for routine analysis.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2007年第6期48-50,共3页
Metallurgical Analysis
关键词
高压密封消解
铁矿石
氟离子选择电极
格氏作图法
氟
digestion with high-pressure airproof vessel
fluorinion selective electrode
Gran chart model
fluorine
iron ore
