ICP-AES测定卤化物溶液中高浓度锂锶含量的研究

Determination of Lithium and Strontium at High Concentration by ICP-AES

采用电感耦合等离子体原子发射光谱法,同时测定高浓度Li-Sr混合溶液中Li+和Sr2+含量。选取合适的测定波长后,研究了酸效应、总盐度、仪器工作参数对测定结果的影响。总盐度在0.20%～0.60%范围内,Li和Sr标准曲线的线性相关系数均大于0.999 9。优化仪器参数后,测定相对误差在+0.59%～-0.66%范围内,样品回收率在99.14%～100.4%之间。该方法稳定性高,重现性好,适合高浓度Li-Sr混合溶液中Li+和Sr2+快速、准确测定。

The concentrations of lithium and strontium of highly concentrated lithium-strontium mixed solution were determined simultaneously by inductively coupled plasma-atomic emission spectroscopy（ICP-AES）.After considering total salinity,relation coefficient and intensity at different wavelengths of lithium and strontium respectively,the determination wavelength was chosen for lithium and strontium separately.Using the determined wavelength,the result varies in terms of acid effect,equipment operating parameters and total salinity in the mixed solution.When the total salinity was in the range of 0.20%～0.60%,the linear correlation coefficient of Li and Sr was better than 0.999 9.After optimizing the instrument parameters,the standard solutions relative errors were within ＋0.59%～-0.66%,and the samples recoveries were within 99.14%～100.4%.This method is reliable due to stability and good recurrence.It can be used to determine high concentration of lithium and strontium ions in the lithium-strontium mixed solution accurately and rapidly.