电感耦合等离子体发射光谱法和火焰原子吸收光谱法连续测定化探样品中12个元素

建立了地质化探样品中不同含量和检出限要求的12个元素的连续测定方法。样品经一次取样,用盐酸-氢氟酸-硝酸-高氯酸溶样,电感耦合等离子体发射光谱法测定铜、铅、锌、钴、镍、镉、锶、钡、钒、锰后,加碘化钾-甲基异丁基甲酮萃取分离,火焰原子吸收光谱法测定银、镉。银、镉的相对标准偏差(RSD,n=12)分别为6.5%、4.7%。与现行分析方法相比,建立的方法灵敏度和精密度高、准确度好,降低了生产成本,缩短了检测时间,尤其适合大量化探样品的测定。

Continuous Determination of 12 Elements in Geochemical Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry and Flame Atomic Absorption Spectrometry

The continuous determination of 12 elements in geochemical samples by inductive coupled plasma-atomic emission spectrometry (ICP-AES) and flame atomic absorption spectrometry (FAAS) was reported in this paper. Samples were digested with mixed acid of HCl-HF-HNO₃-HClO₄ and Cu, Pb, Zn, Co, Ni, Cr, Sr, Ba, V, Mn in the sample solution were determined directly by ICP-AES. Then, Ag and Cd in the same sample solution were enriched by extraction with potassium iodide-methyl isobutyl ketone (KI-MIBK) and determined by FAAS. The precision of FAAS method for Ag and Cd was 6.5% and 4.7% RSD (n=12), respectively. In comparison with the common analytical method, the proposed method provides the higher sensitivity, good accuracy and precision, high economy, high efficiency and is suitable for routine analysis of these elements in geochemical samples.