提出了用电感耦合等离子体原子发射光谱法(ICP-AES)测定铬矿中铁、铝、硅、镁和钙含量的方法。通过试验确定以混合熔剂碳酸钠-碳酸钾-硼砂质量比2比2比1熔融样品,熔块用硝酸(15+80)溶液浸取,分取部分试液按选定条件进行ICP-AES分析。选择393.37,251.61,271.44,396.15,279.55 nm 5条谱线分别作为钙、硅、铁、铝及镁的分析线。用铬矿国家标准样品(BGBW 07201、GSBD 33001.3)制作标准曲线。按此方法对一种国家标准样品(GSBD 33001.2)和两种已知样品(Cr-2、72-Cr-01)进行分析。测定值与认定值基本一致,测得方法的回收率在99.0%~101.5%之间,相对标准偏差(n=6)在0.05%~0.78%之间。

ICP-AES was applied to the determination of Fe, Al, Si, Mg and Ca in chromium ores. The sample was fused with mixed flux of Na2CO3, K2CO3 and Na2B4O7 (2+2+1, mass ratio) and the melt was dissolved with dil. nitric acid (15+80). An aliquot of the sample solution was taken for ICP-AES analysis. The spectral lines of 393.37 nm, 251.61 nm, 271.44 nm, 396.15 nm and 279.55 nm were selected for determination of Ca, Si, Fe, Al and Mg respectively. National standard samples (BGBW 07201 and GSBD 33001.3) were used for preparation of standard curves. As a check for the feasibility of the present method, 3 standard and known samples were analyzed, the results obtained were in consistency with the certified or known values, with values of recovery and RSD′s (n=6) in the ranges of 99.0%-101.5% and 0.05%-0.78% respectively.