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GB/T 9741-2008 PDF English

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GB/T 9741-2008: Chemical reagent -- General method for the determination of residue after ignition
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GB/T 9741: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 9741-2008English140 Add to Cart 0-9 seconds. Auto-delivery Chemical reagent -- General method for the determination of residue after ignition Valid
GB/T 9741-1988English199 Add to Cart 2 days Chemical reagent--General method for the determination of residue after ignition Obsolete

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GB/T 9741-2008: Chemical reagent -- General method for the determination of residue after ignition


---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT9741-2008
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.040.30 G 60 Replacing GB/T 9741-1988 Chemical reagent -- General method for the determination of residue after ignition (ISO 6353-1:1982, Reagents for chemical analysis -- Part 1: General test methods, NEQ) ISSUED ON: MAY 15, 2008 IMPLEMENTED ON: NOVEMBER 01, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Method principle ... 4 3 Instruments ... 4 4 Determination ... 4 5 Calculation ... 5

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℃±50℃. 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

3.1 General laboratory instruments. 3.2 Crucible or evaporating dish: depending on the nature of the sample, the material can be platinum, quartz or ceramic. 3.3 High temperature furnace: the temperature can be maintained at 650℃±50℃. 3.4 Analytical balance: graduation value is 0.1 mg.

4 Determination

4.1 Precautions for determination When volatilizing or carbonizing a sample, if the sample size is large, it can be added in several batches. Add sulfuric acid to the liquid sample. It shall be added all at once before evaporation or carbonization. If the sample is organic, combustion shall be avoided. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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