酸溶电感耦合等离子体发射光谱法同时快速测定地质样品中硅酸盐成分

Simultaneous Determination for Components of Silicate in Geological Samples by Inductively Couple Plasma-Atomic Emission Spectrometric with Acid Digestion

摘要: 样品用硝酸-硫酸-氢氟酸混合酸熔解，电感耦合等离子体发射光谱法同时快速测定地质样品中硅酸盐成分(Al₂O₃, Fe₂O₃(T), CaO, MgO, Na₂O, P₂O₅, MnO and TiO₂)。优化了分析谱线，选择了背景校正模式，采用背景扣除有效消除测定的干扰。以国家标准物质GBW04117-04122验证，方法精密度(RSD, n = 10) < 5%，相对误差(RE) < 6%，检出限L_D为0.0011%~0.125%。具有分解样品彻底完全、简单，时间短等特点。方法易于掌握，一次熔样可以同时快速测定硅酸盐各成分，满足分析方法要求，在实际生产中得到了良好的应用，适用于大批量样品分析。

Abstract: The ore samples were digested with HNO₃-H₂SO₄-HF mixed acid and the method for every compo- nents-Al₂O₃, Fe₂O₃(T), CaO, MgO, Na₂O, P₂O₅, MnO and TiO₂ of silicate in samples were directly determined by in- ductively couple plasma-atomic emission spectrometric (ICP-AES) was established. The conditions for selection of analysis lines were optimized. And the functions of background correction were also selected. The interferences were eliminated by using off peak background correction. The method provides the advantages of relative standard deviations (RSD, n = 10) < 5% and relative errors (RE) < 6% with determination limits (L_D) range from 0.0011% - 0.125% by vali- dating using standard samples GBW 04117-04122. This method exhibited simplicity，rapidity and completely making it suitable for multi-elemental determination. Furthermore，this proposed method has been well applied to the determina- tion in the daily work and met the requirements of national standards.