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GB/T 23986-2009 English PDF (GBT23986-2009)

GB/T 23986-2009 English PDF (GBT23986-2009)

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GB/T 23986-2009: Paints and varnishes -- Determination of volatile organic compound (VOC) content -- Gas-chromatographic method

GB/T 23986-2009
ICS 87.040
G 58
GB/T 23986-2009 / ISO 11890-2.2006
Paints and Varnishes - Determination of Volatile
Organic Compound (VOC) Content - Gas-
chromatographic Method
(ISO 1890-2.2006, Paints and varnishes - Determination of volatile organic compound (VOC) content - Part 2. Gas-chromatographic method, IDT)
ISSUED ON. JUNE 02, 2009
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
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Principle ... 6
5 Required supplementary information ... 6
6 Apparatus ... 6
7 Reagents ... 9
8 Sampling ... 10
9 Procedure ... 10
10 Calculation ... 13
11 Expression of results... 14
12 Precision ... 14
13 Test report ... 15
Annex A (Normative) Required supplementary information ... 17
Annex B (Informative) Examples of gas-chromatographic conditions ... 18 Bibliography ... 21
This Standard is identical with the international standard ISO 11890-2.2006 “Paints and Varnishes - Determination of Volatile Organic Compound (VOC) - Part 2. Gas chromatographic” (English Version).
This Standard is equivalent to translate ISO 11890-2.2006.
For ease of use, the editorial modified contents of this Standard are as follows. --- Use “this Standard” to replace “this international standard”;
--- Delete the foreword of the international standard;
--- For the international standards that are quoted by ISO 11890-2.2006, if those have been equivalently adopted by the corresponding Chinese standards, then use the corresponding Chinese standards to replace; if those are not equivalently adopted by Chinese standards, then directly quote those international standards; --- Delete the Part 2 of the international standard;
--- Because, currently in domestic market, the majority of determination of water content in paint adopts gas chromatography, therefore, ADD content note 3 in 9.2.
In this Standard, Appendix A is normative, Appendix B is informative.
This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of National Standardization Technical Committee of Paint and Color Industry.
Drafting organizations of this Standard. CNOOC Changzhou Painting Chemical Research Institute, Kunshan Shiming Technology Development Co., Ltd.
Chief drafting staffs of this Standard. Ji Junhong, Huang Ning, Du Changsen. Paints and Varnishes - Determination of Volatile
Organic Compound (VOC) Content - Gas-
chromatographic Method
1 Scope
This Standard is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products.
It specifies a method for the determination of the volatile organic compound (VOC) content of paints, varnishes and their raw materials. It is preferred if the expected VOC content is greater than 0.1% (mass fraction) and less than about 15% (mass fraction). When the VOC content is greater than about 15% by mass, the less complicated method given in GB/T 23985 may be used.
This method assumes that the volatile matter is either water or organic. However, other volatile inorganic compounds can be present and might need to be quantified by another suitable method and allowed for in the calculations.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3186 Paint, Varnishes and raw materials for paint and varnish - Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)
GB/T 6283 Determination of water content of industrial products - Karl Fischer method (General method) [GB/T 6283-1986, eqv ISO 760.1978, Determination of water - Karl Fischer Method (General Method)]
GB/T 6750 Paints and varnish - Density determination - Pycnometer method (GB/T 6750-2007, ISO 2811-1, 1997, Paints and varnishes - Determination of density - Part 1. Pycnometer method, IDT)
GB/T 20777 Paints and varnishes - Examination and preparation of samples for testing (GB/T 20777-2006, ISO 1513.1992, IDT)
GB/T 21862.2 Paints and varnishes - Determination of density - Part 2. Immersed body (plummet) method (GB/T 21862. 2-2008. ISO 2811- 2.1997, IDT)
GB/T 21862.3 Paints and varnishes - Determination of density - Part 3. Oscillation method (GB/T 21862.3-2008, ISO 2811-3.1977, IDT)
GB/T 21862.4 Paints and varnishes - Determination of density - Part 4. Pressure cup method (GB/T 21862.4-008, ISO 2811-4.1997, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 Volatile organic compound (VOC)
Any organic liquid and/or solid that evaporates spontaneously at the prevailing temperature and pressure of the atmosphere with which it is in contact. NOTE 1. As to current usage of the term VOC in the field of coating materials, see volatile organic compound content (VOC content).
NOTE 2. Under U.S. government legislation, the term VOC is restricted solely to those compounds that are photochemically active in the atmosphere (see ASTM D 3960). Any other compound is then defined as being an exempt compound.
[ISO 4618.2006]
NOTE 3. Under European legislation, EU Directive 2004/42/EC, the term VOC refers to volatile organic compounds with boiling points up to 250°C, measured at a standard pressure of 101.3 kPa.
3.2 Volatile organic compound content (VOC content)
Mass of the volatile organic compounds present in a coating material, as determined under specified conditions.
NOTE 1. The properties and the amounts of the compounds to be taken into account will depend on the field of application of the coating material. For each field of application, the limiting values and the methods of determination or calculation are stipulated by regulations or by agreement.
[ISO 4618.2006]
NOTE 2. If the term VOC refers to compounds with a defined maximum boiling point (see Note 3 to 3.1), the compounds considered to be part of the VOC content are those with boiling points below that limit and compounds with higher boiling points are considered to be non-volatile organic compounds.
The instrument shall have a variable-temperature injection block with a sample splitter. The injection temperature shall be capable of being set to an accuracy of 1 °C. The split ratio shall be adjustable and capable of being monitored. The sample splitter insert shall contain silanized glass wool to retain non-volatile constituents, and shall be cleaned and provided with new glass wool packing or replaced as required to rule out errors due to residues of binder or pigment (i.e. adsorption of compounds). The occurrence of adsorption is revealed by peak tailing, in particular with components of low volatility.
6.2.3 Cold-injection system with sample splitter
The cold-injection system shall be provided with temperature programming for heating from ambient to 300°C and shall have a sample splitter inlet which is made of an inert material such as glass. The sample splitter shall be provided with silanized glass wool packing and shall be maintained as specified in 6.2.2. The split ratio shall be adjustable and capable of being monitored.
Method precision will be increased if the injection system, especially the hot-injection system, is coupled to an auto-injector. The manufacturer's instructions shall be followed when an auto-injector is used.
6.2.4 Selection of sample injection system
The choice between hot-injection and cold-injection will depend on the type of product under test. It will be necessary to use the cold-injection system for products which at high temperature release substances which interfere with the determination. Indications of cleavage or decomposition reactions may be obtained by looking for changes in the chromatogram (for example the occurrence of foreign peaks or an increase or decrease in peak size) at various sample injector temperatures. The hot-injection system covers all of the volatile constituents, compounds and cleavage products of the binders and additives...

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