样品用蒸馏水溶解,电感耦合等离子体原子发射光谱法同时测定光卤石中钾、钠、钙、镁和硫酸根。选择波长为766.5,330.2,317.9,279.8,181.9 nm 5条谱线依次作为测定钾、钠、钙、镁和硫的分析线。钾、钠、钙、镁和硫的方法检出限(3s)依次为0.8,1.6,0.8,0.8,2.4 mg·L-1。应用此法测定了光卤石样品中5种元素的含量,回收率在97.2%~102.1%之间,相对标准偏差(n=10)小于3.5%。

Sample of carnallite was dissolved in distilled water, an aliquot of the sample solution was taken and used for ICP-AES determination of contents of K, Na, Ca, Mg and SO42-. Spectral lines with wavelengths of 766.5, 330.2, 317.9, 279.8 and 181.9 nm were selected as analytical lines for the determination of K, Na, Ca, Mg and S respectively. Detection limits (3s) found were (mg·L-1) 0.8 (K), 1.6 (Na), 0.8 (Ca), 0.8 (Mg) and 2.4 (S). The proposed method was used in the analysis of sample of carnallite, giving values of recovery of the 5 elements in the range of 97.2%-102.1%and values of RSD′s (n=10) less than 3.5%.