高温合金中微量铈的直接测定——对乙酰基偶氮胂光度法

高温合金中微量铈的直接测定——对乙酰基偶氮胂光度法 SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF CERIUM IN SUPERALLOYS WITH P—ACETYLARSENAZO 朱吕田 Zhu Litian 1 first-author 李振利 Li Zheli and Zhou Lihua 1 周利华 1 大冶钢厂钢研所 大冶钢厂钢研所 Institute of Daye steel Works Institute of Daye steel Works 本文拟定了在HClO 4 -HCl-NaAc介质中,以EDTA-Zn作缓冲络合剂掩蔽合金基体Fe 3+ 、Ni 2+ 、以苦杏仁酸-H 2 O 2 掩蔽Ti 4+ 、Al 3+ 等离子,在pH2～2.5范围内用对乙酰基偶氮胂直接测定高温合金中微量铺的新方法。Cr 3+ 干扰测定,必须除去,Ni 2+ 与EDTA形成蓝色络合物,以相同钢种的参比液抵消其影响。试剂与铈形成的蓝绿色络合物极其稳定,方法简便、快速。已用于各类高温合金中微量铈的直接测定,结果甚为满意。 In Perchloric acid-hydrochloric acid-sodium acetate medium, at pH2.0～2.5, blue-green Colour Complex Can be formed Cerium With P-acetylarsenazo. A new Sensi-tive method based on EDTA-Zn masking Fe 3+ 、Ni 2+ of alloy’s basis, amygdalin acid-hydrogen Peroxide masking Ti 4+ , Al 3+ ions has been developed for the direct dete-rmination of trace Cerium in superalloys. Chromium（Ⅲ） interfere with the determi-naten of Cerium. With Perchloric acid having been used, it can be eliminated to form the chlomyl chloride. Effect of blue complex formed from nickel（Ⅱ） with EDTA can be eliminated by refernee solution of the same grade of alloy. The me-thod has been used in the direct determination of trace cerium in superalloys with satisfactory results. 1984-02-01 2021-04-01 2