Standard No.:	GB/T 12690.7-2021
English Name:	Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 7: Determination of silicon content
Chinese Name:	稀土金属及其氧化物中非稀土杂质化学分析方法 第7部分：硅量的测定
Chinese Classification:	H14    Rare metals and their alloys analysis method
Professional Classification:	GB    National Standard
ICS Classification:	77.120.99 77.120.99    Other non-ferrous metals and their alloys 77.120.99
Source Content Issued by:	SAMR; SAC
Issued on:	2021-10-11
Implemented on:	2022-5-1
Status:	valid
Superseding:	GB/T 12690.7-2003 Neodymium and neodymium oxide-Determination of lanthanum oxide, cerium oxide, praseodymium oxide, s
Target Language:	English
File Format:	PDF
Word Count:	8000 words
Translation Price(USD):	240.0
Delivery:	via email in 1~3 business day

本文件规定了稀土氧化物中全硅含量、稀土金属及其氧化物中酸溶硅含量的测定方法。
本文件适用于稀土金属及其氧化物中硅量的测定，包含钼蓝分光光度法（方法1)和电感耦合等离子体原子发射光谱法（方法2)。钼蓝分光光度法（方法1)适用于稀土氧化物中全硅含量及稀土金属及其氧化物中酸溶硅含量的测定，测定范围（质量分数)：0.001 0%~0.20%；电感耦合等离子体原子发射光谱法（方法2)适用于稀土金属及其氧化物中酸溶硅含量的测定，测定范围（质量分数)：0.010%~0.20%。
当本文件2个方法的分析范围出现重叠时，宜首选方法1作为仲裁方法。