Home / Standards / GB/T 6730.20-1986 GB/T 6730.20-1986 Abolished Methods for chemical analysis of iron ores--The volumetric method for the determination of phosphorus content 铁矿石化学分析方法 容量法测定磷量 Standard Type GBT ICS 73.060 CCS D31 Status 废止 Issue Date 1986-08-19 Implementation 1987-08-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A