一、前言甲醇和混合碳四是醚化反应的主要原料,它们含有微量的金属阳离子,这些金属阳离子能使强酸性阳离子交换树脂中毒而失活。所以测定甲醇、混合碳四和阳离子交换树脂中的金属离子是非常必要的。本文研究了用原子吸收光谱法测定醚化反应中微量钙、镁、钠、铁离子。有资料介绍,把甲醇直接喷入乙炔—空气火焰中来测定铁,由于甲醇进入火焰,助燃比不好控制,此法误差较大。本方法先在甲醇中加入盐酸,再加热除去甲醇, I. INTRODUCTION Methanol and mixed carbon IV are the main raw materials for etherification. They contain trace amounts of metal cations that can inactivate strongly acidic cation exchange resins. Therefore, the determination of methanol, mixed carbon and cation exchange resin in the metal ions is very necessary. In this paper, the trace calcium, magnesium, sodium and iron ions in the etherification reaction were studied by atomic absorption spectrometry. There is information on the direct injection of methanol into the acetylene - air flame to determine the iron, methanol into the flame, combustion control ratio is not good, this method a larger error. The method first adds hydrochloric acid in methanol, and then heats to remove the methanol,