GB/T 23990-2009Determination of the contents of benzene,toluene,ethylbenzene and xylene in coatings by gas chromatography (English PDF)
涂料中苯、甲苯、乙苯和二甲苯含量的测定 气相色谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 2, 2009
Implementation date
February 1, 2010
Scope
GB/T 23990-2009 is the English-translated version of 涂料中苯、甲苯、乙苯和二甲苯含量的测定 气相色谱法.
GB/T 23990-2009 lays down a gas chromatographic method for measuring how much benzene, toluene, ethylbenzene and xylene a coating contains.
Clause 1 states that the standard specifies the use of gas chromatography for that determination and splits the work into two methods, Method A for the determination of the four compounds in solvent-based coatings and Method B for their determination in water-based coatings; no other restriction is given.
Clause 3 gives the principle: the diluted specimen is injected directly into the gas chromatograph, the tested compound is separated by chromatographic separation technology, detected by a hydrogen flame ionization detector and quantified by the internal standard method.
The table of contents lists ten clauses, namely Scope, Normative references, Principle, Reagents and materials, Equipment, Sampling, Gas chromatography test conditions, the two determination clauses for solvent-based and water-based coatings, and Test report; clause 2 cites GB/T 3186.
Clause 4 requires nitrogen as carrier gas and hydrogen as fuel gas, both of purity not less than 99.995%, and the procedures use the acetonitrile dilution solvent listed as 4.7 and the internal standard substance listed as 4.5.
Clause 7 sets out two alternative sets of chromatographic conditions, the first on a polydimethylsiloxane capillary column of 30 m by 0.32 mm inner diameter with a 0.25 µm film and the second on a 6% cyanopropyl phenyl / 94% polydimethylsiloxane capillary column of 60 m by 0.32 mm with a 1.0 µm film, each with its own inlet, column and detector temperatures and carrier gas flow, and it notes that the best conditions may also be chosen from the performance of the chromatograph used and the actual state of the specimen.
Method A requires, under reproducibility, that the relative deviation of results between different laboratories be less than 10%, while Method B requires every test to be run as two parallel determinations, with the instrument parameters optimised before each series, the retention time of each test compound recorded from a standard solution, the sample diluted with acetonitrile for the qualitative check and relative correction factors measured during calibration.
The copy of the text on the page is an excerpt that breaks off inside clause 9, so the equipment, sampling and test report clauses are not shown. It was issued on 2 June 2009 and has applied since 1 February 2010.
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Document preview — GB/T 23990-2009
National Standard of the People's Republic of China
- ICS
- 87.040
- Classification
- G 50
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Principle4
- 4 Reagents and materials4
- 5 Equipment5
- 6 Sampling5
- 7 Gas chromatography test conditions6
- 8 Determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings (method A)6
- 9 Determination of benzene, toluene, ethylbenzene and xylene content in water-based paint (method B)9
- 10 Test report11
1 Scope
This standard specifies the use of gas chromatography to determine the content of benzene, toluene, ethylbenzene and xylene in coatings.
In this standard, Method A is suitable for the determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings; Method B is suitable for the determination of benzene, toluene, ethylbenzene and xylene content in water-based coatings.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 3186 Paints varnishes and raw materials for paints and varnishes - Sampling (GB/T 3186-2006, ISO 15528:2000, IDT)
3 Principle
After the specimen is diluted, it is directly injected into the gas chromatograph, the tested compound is separated by chromatographic separation technology, detected by a hydrogen flame ionization detector, quantified by internal standard method.
4 Reagents and materials
4.1 Carrier gas: nitrogen, purity >= 99.995%.
4.2 Fuel gas: hydrogen, purity >= 99.995%.
7 Gas chromatography test conditions
7.1 Test conditions 1 of gas chromatography
Chromatographic column: polydimethylsiloxane capillary column, 30 m x 0.32 mm inner diameter x 0.25 µm film thickness; Inlet temperature: 250 °C;
Column temperature: Keep the initial temperature at 40 °C for 5 min; then increase to 260 °C at 10 °C/min and keep it for 5 min; Detector temperature: 280 °C; Carrier gas flow rate: 1.0 mL/min; Split ratio: Split injection, wherein the split ratio is adjustable.
7.2 Test conditions 2 of gas chromatography
Chromatographic column: 6% cyanopropyl phenyl/94% polydimethylsiloxane capillary column, 60 m x 0.32 mm inner diameter x 1.0 µm film thickness; Inlet temperature: 200 °C;
Column temperature: keep the initial temperature at 65 °C for 16 min, raise it at 15 °C/min to 130 °C for 5 min; then increase it at 10 °C/min to 150 °C and keep it for 7 min; Detector temperature: 300 °C;
Carrier gas flow rate: 0.9 mL/min for 15 min, raise to 1.5 mL/min at 10 mL/min2 and keep for 10 min, then raise to 4 mL/min at 30 mL/min2 and keep for 2 min. Split ratio: Split injection, wherein the split ratio is adjustable.
Note: The best gas chromatograph test conditions can also be selected according to the performance of the gas chromatograph used and the actual situation of the specimen to be tested.
8 Determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings (method A)
8.5.2 Reproducibility
The relative deviation of test results between different laboratories is less than 10%.
9 Determination of benzene, toluene, ethylbenzene and xylene content in water-based paint (method B)
All tests are carried out in two parallel determinations.
9.1 Optimization of chromatograph parameters
According to the chromatographic conditions in Chapter 7, the known calibration compound shall be used to optimize it every time, so that the sensitivity, stability and separation effect of the instrument are in the best state.
9.2 Qualitative analysis of products
9.2.1 Optimize the instrument parameters as shown in 9.1.
9.2.2 Determination of the retention time of the test compound: Inject 1.0 µL of the standard solution containing the test compound as shown in 4.6; record the retention time of each test compound.
9.2.3 Qualitative inspection of the tested compound in the sample: Take about 1 g of the sample and use the diluent solvent acetonitrile (4.7) to dilute it; inject 1.0 µL into the chromatograph, to determine whether there is the tested compound.
9.3 Calibration
9.3.1 Weigh a certain amount (accurate to 0.1 mg) of various calibration compounds in a sample bottle. The weighed amount shall be equivalent to the respective content of the product to be tested.
Weigh an internal standard substance (4.5) similar to that of the test compound in the same sample bottle; use the dilution solvent acetonitrile (4.7) to dilute and mix it; seal the sample bottle and shake well; then place it under the conditions same as the tested specimen to perform separation and determination.
9.3.2 Test of relative correction factor: Optimize the instrument parameters according to the provisions of 9.1 under the same chromatographic conditions as the test sample. Inject an appropriate amount of calibration compound into the gas chromatograph and record the chromatogram. Calculate the relative […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
Cited by
- GB 30981.2-2025Limit of harmful substances of coatings - Part 2: Industrial coatings
- GB 46028-2025Safety technical requirements for building decorative stone
- GB/T 20623-2025Emulsions for architectural coatings
- JC/T 864-2023Polymer Emulsion Architectural Waterproof Coating
- GB 18581-2020Limit of Harmful Substances of Woodenware Coatings
- GB 18582-2020Limit of harmful substances of architectural wall coatings
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