GB/T 9741-2008Chemical reagent -- General method for the determination of residue after ignition (English PDF)

Foreword

The degree of consistency between this Standard and ISO 6353-1:1982 "Reagents for

chemical analysis -- Part 1: General test methods" is not equivalent.

This Standard replaces GB/T 9741-1988 "Chemical reagent -- General method for the

determination of residue after ignition". Compared with GB/T 9741-1988, the main

changes in this Standard are as follows:

- Adjust the ignition temperature (Chapter 1, 3.3 of Edition 1988; Chapter 1, 3.3 of

this Edition);

- Delete Annex A (Edition 1988).

This Standard was proposed by China Petroleum and Chemical Industry Association.

This Standard shall be under the jurisdiction of Subcommittee on Chemical reagents of

National Technical Committee on Chemical of Standardization Administration of China

(SAC/TC 63/SC 3).

The drafting organization of this Standard: Shanghai Shisi Hewei Chemical Co., Ltd.

Main drafter of this Standard: Jia Ling.

This Standard was first issued in 1988.

Chemical reagent -- General method for the determination

of residue after ignition

1 Scope

This Standard specifies a general method for the gravimetric determination of ignition

residue.

This Standard is applicable to the determination of the burning residue of chemical

reagents that can be sublimated or carbonized and can be removed at 650°C±50°C.

When using this standard to measure ignition residue, the mass of the residue calculated

based on the sampling amount and specification value shall not be less than 1 mg.

2 Method principle

Utilizing the differences in physical and chemical properties such as volatility, stability

to heat, and oxygen between the sample body and the substances that form the residue,

the sample is heated at low temperatures to volatilize, carbonize, and burn at high

temperatures to completely separate the sample body from the residue. The mass of the

residue can be weighed using a scale.

3 Instruments

4 Determination