Home / Standards / GB/T 223.52-1987 GB/T 223.52-1987 Active Methods for chemical analysis of iron，steel and alloy--The hydroxylamine hydrochloride-iodometric method for the determination of selenium content 钢铁及合金化学分析方法 盐酸羟胺-碘量法测定硒量 Standard Type GBT ICS 77.080 CCS H11 Status 现行 Issue Date 1987-05-12 Implementation 1988-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A