【摘要】 萤石试样以过氧化钠为熔剂,于铁坩埚内进行快速熔融,熔块以含硼酸的热水溶液浸取,盐酸溶解试样,制成母液。以硅钼蓝分光光度法测定二氧化硅含量,以EDTA滴定法测定总钙量,单独测定CaCO3的量用以校正总钙量从而得到CaF2含量。以硼酸消除氟的干扰,以三乙醇胺掩蔽Fe3+、Al3+,并以同品种的标准样品绘作校准曲线和采用标准样品换算的方法对数据进行处理。本方法用于萤石标准样品中SiO2,CaF2的测定,相对标准偏差分别为4.5%和1.7%,测定值与认定值一致,t检验合格。方法适用于工厂实验室的日常分析。更多还原

【Abstract】 The fluorite sample was rapidly melted in an iron crucible using sodium peroxide as flux.The fusion cake was leached with hot water containing boric acid.The sample was then dissolved with hydrochloric acid to prepare the mother solution.The content of silicon dioxide and total calcium were determined by silicomolybdic blue spectrophotometry and EDTA titrimetry,respectively.The amount of CaCO3 was singly determined to correct the total calcium and calculate the content of calcium fluoride.The interference of fluorine was eliminated by boric acid,and Fe3+ and Al3+ were masked by triethanolamine.The calibration curve was plotted with the same type of standard sample,and the data was processed using standard sample conversion method.The proposed method was applied to the determination of silicon dioxide and calcium fluoride in fluorite standard sample.The relative standard deviations(RSD) were 4.5 % and 1.7 %,respectively.The determination results were consistent with the certified values,and the t test was qualified.This method was applicable to the daily analysis in factory laboratories.更多还原