GB/T 12690.7-2021 Active
GB/T 12690.7-2021 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 7:Determination of silicon content
Abstract
This document specifies the determination methods for the total silicon content in rare earth oxides and the acid-soluble silicon content in rare earth metals and their oxides.
This document is applicable to the determination of silicon content in rare earth metals and their oxides, including the molybdenum blue spectrophotometry method (Method 1) and the inductively coupled plasma atomic emission spectrometry method (Method 2). The molybdenum blue spectrophotometry method (Method 1) is suitable for the determination of the total silicon content in rare earth oxides and the acid-soluble silicon content in rare earth metals and their oxides, with a determination range (mass fraction) of 0.001% to 0.20%; the inductively coupled plasma atomic emission spectrometry method (Method 2) is suitable for the determination of the acid-soluble silicon content in rare earth metals and their oxides, with a determination range (mass fraction) of 0.010% to 0.20%.
When the analysis ranges of the two methods in this document overlap, Method 1 should be preferentially used as the arbitration method.
General Product Information
| Document Type | National standards |
|---|---|
| Standard Status | Active |
| Standard Code | GB/T 12690.7-2021 |
| CCS | Analysis methods for rare metals and their alloys |
| ICS | Other non-ferrous metals and their alloys |
| Implement Date | 2022-05-01 |