GB/T 12690.7-2021 Active National standards

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

Publish Date: 2021-10-11 Implement Date: 2022-05-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 12690.7-2021

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Analysis methods for rare metals and their alloys

ICS Name: Other non-ferrous metals and their alloys

Publish Date: 2021-10-11

Implement Date: 2022-05-01

Pages: 13 pages

Scope

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.