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一、前言本文是研究制定分析标准参考物质HGHR-781中Th的方法。该物质是模拟谷物灰经酸溶后的化学成分的人工合成溶液。成分复杂,多种离子含量很高而Th又极微。目前尚无特效试剂可以方便地进行直接分光光度测定,需预先分离消除干扰。溶剂萃取法有些报道,但要除去本样品中所有其他离子的影响尚有困难。有人用
First, the preface This article is to study the development of a standard reference material HGHR-781 Th method. This substance is a synthetic solution that simulates the chemical composition of grain ash after acid solubilization. Complex composition, a variety of high ion content and Th very small. There are no specific reagents available for direct spectrophotometric determination of the need to pre-separation to eliminate interference. Solvent extraction has been reported, but it is difficult to remove the effects of all other ions in this sample. Some people use