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Standard Insuued on: 1990-01

GB/T 12690.6-2003    Praseodymium oxide-Determination of lanthanum oxide, cerium oxide, neodymium oxide, samarium oxide
稀土金属及其氧化物中非稀土杂质化学分析方法 铁量的测定 硫氰酸钾、1,10-二氮杂菲分光光度法
Category No.:GB Valid Status:superseded
Issued Organization:AQSIQ Issued Date:1990-01-02
Implemented Date:2004-6-1 Abolished Date:
Superseded Standard.:GB/T 12690.6-2017 Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides - Part 6: Determination of iron content - Kslium thiocyanate, 1, 10-Phenanthroline spectrophotometric method
Superseded Date:2018-5-1
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GB 12211-1990   GB/T 12647-1990   GB 12518-1990   GB/T 2424.9-1990   GB/T 12562-1990   GB 10120-1988   GB/T 12238-2008   GB/T 12208-2008   GB/T 12690.6-2003   GB/T 12607-2003   GB/T 12160-2002   GB/T 12690.11-1990   GB/T 12687.8-1990   GB/T 12687.5-1990   GB/T 12690.23-1990   GB/T 12690.4-1990   GB/T 12687.2-1990   GB/T 12687.1-1990   GB/T 12687.7-1990   GB/T 12657-1990  

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