GB/T 12689.10-2004The methods for chemical analysis of zinc and zinc alloys--The determination of tin content--The phenylfluorone-cetyltrimethyla-mmonium bromide spectrophotometric method (English PDF)

3 Reagents

4 Apparatus

5 Analytical procedure

6 Calculation of the analytical results

7 Precision

8 Quality assurance and control

Foreword

This document was issued on 30 April 2004 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the Standardization Administration of China, and has been in force since 1 October 2004.

It replaces GB/T 12689.6-1990.

Classification: ICS 77.040.30, CCS H13.

About this edition

GB/T 12689.10-2004 is the current edition. It was issued on 30 April 2004 and has been in force since 1 October 2004, replacing GB/T 12689.6-1990.

GB/T 12689.6-1990 has been superseded: a specification that still cites it is citing a withdrawn edition.

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 12689.10-2004 is classified under ICS 77.040.30, 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 H13. 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.