Home / Standards / GB 223.52-87 GB 223.52-87 Methods for chemical analysis of iron, steel and alloy — Determination of selenium content by hydroxylamine hydrochloride-iodometric method 钢铁及合金化学分析方法 盐酸羟胺-碘量法测定硒量 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