GB/T 7531-2008 English PDF (GBT7531-2008)

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GB/T 7531-2008: Determination of ignition residue for organic chemical products
GB/T 7531-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.40
G 15
Replacing GB/T 7531-1987
Determination of ignition residue
for organic chemical products
(ISO 6353-1:1982, Reagents for chemical analysis -
Part 1: General test methods, NEQ)
ISSUED ON: JUNE 04, 2008
IMPLEMENTED ON: DECEMBER 01, 2008
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 General provisions ... 4 
4 Method summary ... 5 
5 Reagents ... 5 
6 Instruments ... 5 
7 Analysis steps ... 5 
8 Result calculation ... 6 
9 Allowable difference ... 6 
Foreword
The degree of consistency between this Standard and 5.15 (GM15) of ISO
6353:1:1982, Reagents for chemical analysis - Part 1: General test methods,
NEQ, is non-equivalent.
This Standard replaces GB/T 7531-1987, Determination of ash content for
organic chemical products.
Compared with GB/T 7531-1987, the major changes of this Standard are as
follows:
-- Change the standard from "Determination of ash content for organic
chemical products" to "Determination of ignition residue for organic
chemical products" (cover of version 1987, cover of this version);
-- Add the normative references (see Chapter 2 of this Standard);
-- Change the volume of the crucible from (50 ~ 100) mL to (30 ~ 100) mL
(3.3 of version 1987, 6.3 of this version).
-- Modify the weighing mass from “it shall be based the acquisition of 5 mg ~
30 mg of residue” to “it shall be based on the acquisition of not less than
3 mg of residue” (5.3 of version 1987, 7.3 of this version);
-- Modify the allowable difference between two parallel determination results
(Chapter 6 of version 1987, Chapter 7 of this version).
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of Organic Branch, National
Standardization Technical Committee of Chemical (SAC/TC 63/SC 2).
The drafting organizations of this Standard: Jinan IFT Science and Technology
Co., Ltd., Chemical Technology Academy of Shandong Province.
Organizations that participate in the drafting of this Standard: Hubei Yihua
Chemical Industry Co., Ltd.
The drafters of this Standard: Han Shuxia, Zhang Guiqin, Li Shihui, Zou Benlian.
This Standard was first published in March 1987.
Determination of ignition residue
for organic chemical products
Warning: This standard does not mention all safety issues that are related
to the use of the standard. It is the responsibility of the user to take
appropriate safety and protective measures and to ensure compliance
with the relevant national regulations.
1 Scope
This Standard specifies the general method for the direct determination of
ignition residues for organic chemical products.
This Standard applies to the determination of ignition residue content for
organic chemical products.
2 Normative references
The terms in the following documents become the terms of this Part by
reference to this Part. For dated references, all subsequent amendments (not
including errata content) or revisions do not apply to this Part. However, parties
to agreements that are based on this Part are encouraged to study whether the
latest versions of these documents can be used. For undated references, the
latest edition applies to this Part.
GB/T 603-2002, Chemical reagent. Preparations of reagent solutions for use
in test methods (ISO 6353-1:1982, NEQ)
3 General provisions
Unless otherwise stated, use only reagents that are identified as analytical
reagent in the analysis
The preparations and products that are used in the analysis are prepared
according to the provisions of GB/T 603-2002 when no other requirements are
indicated.