GB/T 12496.18-1999Test methods of wooden activated carbon--Determination of acid-soluble substance (English PDF)

3 Summary of the method

4 Apparatus

5 Reagents and solutions

6 Procedure

7 Calculation of the results

Foreword

This document was issued on 10 November 1999 by the State Administration of Quality and Technical Supervision, and has been in force since 1 April 2000.

It replaces GB/T 12496.12-1990.

Classification: ICS 65.050, CCS B73.

About this edition

GB/T 12496.18-1999 is the current edition. It was issued on 10 November 1999 and has been in force since 1 April 2000, replacing GB/T 12496.12-1990.

GB/T 12496.12-1990 has been superseded: a specification that still cites it is citing a withdrawn edition.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 12496.18-1999 is classified under ICS 65.050, in the field of agriculture. 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 B73. 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.