GB/T 6679-2003 PDF English
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| GB/T 6679-2003 | English | 460 |
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General rules for sampling solid chemical products
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| GB/T 6679-1986 | English | 679 |
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General rules for sampling of solid chemical products
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GB/T 6679-2003: General rules for sampling solid chemical products---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/GBT6679-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.01
G 04
Replacing GB/T 6679-1986
General rules for sampling solid chemical products
Issued on. OCTOBER 11, 2003
Implemented on. MAY 01, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 General... 4
4 Sampling techniques... 6
5 Sample preparation... 9
6 Sampling report... 11
Appendix A (Informative) Sampling probe... 12
Appendix B (Informative) Sampling drill... 15
Appendix C (Informative) Pneumatic and vacuum probes... 16
Appendix D (Informative) Sample divider... 19
Appendix E (Informative) Automatic sampler... 23
Foreword
There is no difference in technical content between this standard and the previous
version. The content is editorially modified in accordance with GB/T 1.1-2000.
This standard replaces GB/T 6679-1986 General rules for sampling of solid chemical
products from the date of implementation.
Appendix A, Appendix B, Appendix C, Appendix D and Appendix E of this standard
are informative appendices.
This standard is proposed by China Petroleum and Chemical Industry Federation.
This standard shall be under the jurisdiction of National Standardization Technical
Committee of Chemical (SAC/TC 63).
This standard shall be under the interpretation of National Standardization Technical
Committee of Chemical.
Organization responsible for the drafting of this standard. Zhonghua Chemical
Standardization Institute.
Organizations participating in the drafting of this standard. Changzhou Entry-Exit
Inspection and Quarantine Bureau, Nantong Entry-Exit Inspection and Quarantine
Bureau, Tianjin Yishang Investment Co., Ltd.
Main drafters of this standard. Zhou Wei, Zhou Feizhou, Wang Xiaobing, Wang Hua,
Mei Jian, Wang Rong, Zhang Junxi.
This standard was first published in August 1986.
General rules for sampling solid chemical products
1 Scope
This standard specifies the sampling techniques, sample preparation, and sampling
report for solid chemical products.
This standard applies to the sampling of solid chemical products. This standard does
not apply to the sampling of suspended solids and slurries in gases.
2 Normative references
The terms in the following documents become the terms of this standard by reference.
For dated references, all subsequent amendments (not including errata content) or
revisions do not apply to this standard. However, parties reaching an agreement based
on this standard are encouraged to study whether the latest versions of these documents
can be used. For undated references, the latest version applies to this standard.
GB/T 3723, Sampling of chemical products for industrial use - Safety in sampling
(GB/T 3723-1999, idt ISO 3165.1976)
GB/T 6678-2003, General principles for sampling chemical products
3 General
3.1 Sample types of solid chemical products
Sample types include partial sample, directional sample, representative sample, cross-
sectional sample and geometric sample.
The sample type shall be determined based on the sampling purpose, sampling
conditions, and material conditions (batch size, geometric state, particle size, uniformity,
and variability distribution of characteristic values).
3.2 Basic requirements for samples
3.2.1 Sampling inspection is an inspection method that evaluates and judges the quality
of the overall material by inspecting samples. The sample must be representative of the
overall material characteristics.
3.2.2 The amount of samples collected shall be able to represent all the characteristics
3.4 Sampling plan
3.4.1 A sampling plan must be developed before sampling.
3.4.2 The purpose of developing a sampling plan is to obtain representative samples of
the overall material at the lowest cost and within the allowable sampling error range.
3.4.3 The factors that must be considered when developing a sampling plan are mainly
the sampling purpose, the difference in overall material characteristic values, the
allowable sampling error, and the packaging and transportation method of the material
(according to the provisions of GB/T 6678).
3.4.4 The theoretical basis for formulating the sampling plan is specified in GB/T 6678.
3.5 Others
3.5.1 Since there are many types of solid chemical products and the sampling conditions
are ever-changing, the sampling shall be based on the basic principles and methods
specified in this standard, and the optimal sampling plan and sampling techniques shall
be selected according to the actual situation and possibility.
4 Sampling techniques
4.1 Principle for selecting sampling techniques
4.1.1 The principles for selecting sampling techniques shall be based on the shape,
particle size, quantity, difference in material characteristic values, and state (stationary
or moving) of the materials to be sampled.
4.2 Basic requirements for samplers and sample dividers
4.2.1 The materials used must not have any reaction with the materials to be sampled,
and must not cause contamination, delamination or loss of the materials to be sampled.
4.2.2 It shall be clean, dry, easy to use, clean, maintain, inspect and repair.
4.2.3 Any sampling device (especially automatic sampler) shall be subject to a
feasibility test before formal use.
4.2.4 For the types of samplers and sample dividers, see Appendix A, Appendix B,
Appendix C, Appendix D and Appendix E.
4.3 Sampling method
4.3.1 Sampling of powders, granules and small crystals
4.3.3 Sampling of massive materials
4.3.3.1 Stationary materials
Respectively take partial samples, directional samples, geometric samples or
representative samples according to the material conditions. They are separately
described as follows.
a) Partial sample
4.3.3.2 Moving materials
Take cross-sectional samples randomly or at certain time intervals.
If the material can be crushed, take samples according to the method in 4.3.1 after
crushing.
4.3.4 Sampling of solids that can be cut
Use a knife or other suitable tool (such as a metal wire) to take a cross-sectional sample
or a geometric sample of a certain shape and weight from a certain part of the material.
4.3.5 Solids requiring special processing
4.3.5.4 Sampling of solids that react with the surrounding environment
4.3.5.5 Reactive or unstable solids
Such solids shall be sampled in accordance with relevant standards and regulations.
5 Sample preparation
5.1 Purpose of sample preparation
Obtain the optimal amount of samples from a larger amount of original samples that
can meet the inspection requirements and whose properties to be measured can
represent the overall material characteristics.
5.2 Principle of sample preparation
5.3 Sample preparation stage
It generally includes three stages. crushing, mixing and reduction. The operation shall
be repeated one or more times depending on the situation until the final sample is
obtained.
5.4 Sample preparation techniques
Crushing, mixing, and reduction can be carried out by manual or mechanical methods
according to the situation and possibility.
5.4.1 Crushing
5.4.2 Mixing
5.4.2.1 Manual method
Depending on the size of the sample, use an appropriate hand tool (such as hand shovel,
etc.) to mix the sample.
5.5 Final sample quantity and storage
5.5.1 The final sample quantity shall meet the needs of testing and preparation. Divide
the sample into two generally equal parts. One for testing and one for reference. The
amount of each sample shall be at least three times the amount required for testing.
5.5.2 Packaging materials and appropriate packaging forms that are inert to the sample
shall be selected based on the sample and storage time.
5.5.3 Sample packaging containers shall comply with the provisions of GB/T 6678.
5.5.4 The container shall be labeled with the specified content immediately after loading
(according to the provisions of GB/T 6678).
6 Sampling report
According to the provisions of GB/T 6678.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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