GB/T 18115.14-2010Chemical analysis methods of rare earth impurities in rare earth metals and their oxides - Part 14 : Ytterbium - Determination of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, lutetium and yttrium contents (English PDF)

3 Reagents and materials

4 Apparatus

5 Test specimens

6 Analytical procedure

7 Calculation and expression of the analytical results

8 Precision

9 Quality assurance and control

10 Scope

11 Principle of the method

12 Reagents and materials

13 Apparatus

14 Test specimens

15 Analytical procedure

16 Calculation and expression of the analytical results

17 Precision

18 Quality assurance and control

Foreword

This document was issued on 14 January 2011 by the State Administration for Market Regulation and the Standardization Administration of the People's Republic of China, and has been in force since 1 November 2011.

It is the first edition of this standard.

Classification: ICS 77.120.99, CCS H14.

About this edition

GB/T 18115.14-2010 is the first edition of this standard. It was issued on 14 January 2011 and has been in force since 1 November 2011.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite GB/T 18115.14-2010 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.

Classification and status

GB/T 18115.14-2010 is classified under ICS 77.120.99, in the field of metallurgy. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS H14. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.