Home / Standards / GB/T 223.50-1994 GB/T 223.50-1994 Active Methods for chemical analysis of iron，steel and alloy--The phenylfluorone-CTMAB direct photometric method for the determination of tin content 钢铁及合金化学分析方法 苯基荧光酮-溴化十六烷基三甲基胺直接光度法测定锡量 Standard Type GBT ICS 77.080 CCS H11 Status 现行 Issue Date 1994-09-26 Implementation 1995-06-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A