Home / Standards / GB 223.42-85 GB 223.42-85 Methods for chemical analysis of iron, steel and alloy — Determination of tantalum content by ion exchange separation and bromopyrogallol red photometric method 钢铁及合金化学分析方法 离子交换分离-溴邻苯三酚光度法测定钽量 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A