Abstract ICP-MS method is developed and validated for quantification of trace elemental impurities in caustic potash. Employment of suitable system configuration and optimization of operational parameters was done. Argon Gas Dilution (AGD) kit was employed in this method and metal ions analyzed by employing this method include 208Pb, 111Cd, 107Ag, 88Sr, 64Zn, 63Cu, 59Co, 58Ni, 57Fe, 55Mn and 52Cr. Under normal/routine configuration (without AGD kit), ICP-MS instrument can handle solution having dissolved solids up to 0.2% and is susceptible to compromise with low detection limits. In this work, 1% KOH solution is aspirated post its neutralization by high pure grade HNO3 using AGD kit. It addresses issues of high dissolved solids and high alkalinity. External calibration with internal standards (Sc, Y, Gd) is performed with the matrix of KNO3 since neutralization of KOH by HNO3 forms KNO3. A detailed study of the key features related to the method development such as matrix-matching, accuracy and precision was done.

中文翻译：

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用于测定苛性钾中痕量元素杂质的 ICP-MS 方法开发和验证

摘要 ICP-MS 方法被开发和验证用于苛性钾中痕量元素杂质的定量。使用了合适的系统配置并优化了操作参数。该方法采用氩气稀释 (AGD) 试剂盒，采用该方法分析的金属离子包括 208Pb、111Cd、107Ag、88Sr、64Zn、63Cu、59Co、58Ni、57Fe、55Mn 和 52Cr。在正常/常规配置（无 AGD 套件）下，ICP-MS 仪器可以处理溶解固体高达 0.2% 的溶液，并且容易受到低检测限的影响。在这项工作中，1% KOH 溶液在使用 AGD 套件被高纯 HNO3 中和后被吸入。它解决了高溶解固体和高碱度的问题。使用内标（Sc、Y、Gd) 是用 KNO3 基质进行的，因为 KOH 被 HNO3 中和形成 KNO3。对与方法开发相关的关键特征（如基质匹配、准确度和精密度）进行了详细研究。