- Standard No.
- GB/T 12690.13-1990
- Language
- Chinese
- Release Date
- 1990
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Replace By
-
GB/T 12690.1-2002
- Lastest
-
GB/T 12690.1-2022
- Scope
- This standard specifies the method for the determination of carbon content in metal neodymium and metal samarium. This standard is applicable to the determination of carbon content in metal neodymium and metal samarium, and the determination range is 0.01% to 0.5%.
GB/T 12690.13-1990 history
- 2022 GB/T 12690.1-2022 Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 1:Determination of carbon and sulfur contents—High frequency-infrared absorption method
- 2015 GB/T 12690.1-2015 Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides.Part 1: Determination of carbon and sulfur contents.High frequency-infrared absorption method
- 2002 GB/T 12690.1-2002 Chemical analysis methods for non-RE impurity of rare earth metals and their oxides-Determination of carbon and sulfur contents--High frequency-infrared absorption method
- 1990 GB/T 12690.13-1990 Neodymium and samarium--Determination of carbon content--High frequency--Infrared absorption method
GB/T 12690.13-1990 was changed to GB/T 12690.1-2002 Chemical analysis methods for non-RE impurity of rare earth metals and their oxides-Determination of carbon and sulfur contents--High frequency-infrared absorption method.