碱熔-电感耦合等离子体原子发射光谱法测定富铟烟灰中铟

富铟烟灰样品种类较多,此类样品使用常规的酸不能完全溶解,需要使用强碱在高温条件下熔样。实验采用过氧化钠熔解试样,盐酸浸取,能使样品溶解完全。试液分取后使用电感耦合等离子体原子发射光谱法(ICP-AES)测定铟。铟的质量浓度为1.00～20.00 μg/mL时,校准曲线的线性相关系数r为0.999 9,检出限为0.001％(质量分数)。实验方法用于测定4个典型富铟烟灰物料中铟,结果的相对标准偏差(RSD, n=11)小于2%,加标回收率为99％～103％。使用标准加入法和工作曲线法的校正方法其测定结果相吻合。

Determination of indium in indium-rich soot by alkali fusion-inductively coupled plasma atomic emission spectrometry

There are many kinds of indium-rich soot samples. Such samples cannot be completely dissolved using the conventional acids, and it should be fused with strong alkali at high temperature. The sample was fused with sodium peroxide in experiments, and it could be fully dissolved after leaching with hydrochloric acid. The content of indium in sample solution was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). When the mass concentration of indium was in range of 1.00-20.00 μg/mL, the linear correlation coefficient (r) of calibration curves was 0.999 9. The limit of detection was 0.001% (mass fraction). The content of indium in four typical indium-rich soot samples was determined according to the experimental method. The relative standard deviations (RSD, n=11) were less than 2%, and the spiked recoveries were between 99% and 103%. The determination results were consistent with those obtained by standard addition method and working curve method with correction.