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International Standard Category: Cadmium, cobalt and their alloys

GB/T 12690.15-1990    Rare-earth metals and their oxides--Determination of thorium content--Arsenazo Ⅲ spectrophotometric method
稀土金属及其氧化物化学分析方法 偶氮胂Ⅲ分光光度法 测定钍量 ;
Category No.:77.120.70 Valid Status:superseded
Issued Organization: Issued Date:1990-12-30
Implemented Date:1992-1-1 Abolished Date:2004-06-01
Superseded Standard.:GB/T 12690.12-2003 Neodymium and samarium-Determination of oxygen content-Impulse-infrared absorption method
Superseded Date:2004-6-1
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