电感耦合等离子体原子发射光谱法测定硅铝钡锶合金中锶

探讨了用电感耦合等离子体原子发射光谱法(ICP-AES)测定硅铝钡锶合金中锶元素的分析条件并建立了测定方法。样品用盐酸、硝酸和氢氟酸溶解, 硼酸除氟, 试液经过滤后, 选择强度较大、峰形较好、干扰小和稳定性好的421.5 nm谱线作为分析线进行测定。结果表明, 锶浓度在0.001～0.025 mg/mL范围内线性关系良好, 线性方程为I= 11 551.75 ρ+72 706 384, 相关系数R²=0.999 9。对硅铝钡锶合金标准样品进行测定, 锶的测定值与认定值基本一致。硅铝钡锶合金实际样品中锶测定结果的相对标准偏差(n=10)为0.067%, 加标回收率为106%。

Determination of strontium in silicon-aluminum-barium-stronium alloy by inductively coupled plasma atomic emission spectrometry

The condition and method for determination of strontium in silicon-aluminum-barium-strontium alloy was established by inductively coupled plasma atomic emission spectrometry (ICP-AES). The sample was dissolved with hydrochloric acid, nitric acid and hydrofluoric acid, then boric acid was used to dispel fluoride. After the test solution was filtered, 421.5 nm was chosen as the analytical line to carry out the determination because it had the advantage of large spectral intensity, good peak shape, small interference and good stability. The results showed that the concentration of strontium in the range of 0.001-0.025 mg/mL established a linear relationship with linear equation of I=11 551.75ρ+72 706 384 and correlation coefficient R²=0.999 9. When the proposed method was applied to determination of strontium in certified reference materials of silicon-aluminum-barium-strontium alloy, the results were consistent with the certified values. The relative standard deviation for determination of strontium in silicon-aluminum-barium-strontium alloy actual samples was 0.067% and the recovery was 106%.