GB/T 21198.4-2007
AbolishedDetermination of precious metals in precious metals jewellery alloys - Method using ICP spectrometry - Part 4:999‰ precious metals jewellery alloys - Determination of precious metals - Difference method
贵金属合金首饰中贵金属含量的测定 ICP光谱法 第4部分:999‰贵金属合金首饰 贵金属含量的测定 差减法