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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of National Technical Committee 5 on Paints & Pigments of Standardization Administration of China (SAC/TC 5).
Determination of polycyclic aromatic hydrocarbons in coatings
Warning: Users of this standard shall be experienced in normal laboratory practicing. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to adopt appropriate safety and health measures and to ensure compliance with any national regulatory conditions.
1 Scope
This standard specifies the terms and definitions, principles, reagents and materials, apparatus, samples, test procedures, test data processing, precision and test reports for the determination of polycyclic aromatic hydrocarbons in coatings by gas chromatography-mass spectrometry.
This standard is applicable to the determination of polycyclic aromatic hydrocarbons in coatings and coating films, including but not limited to the polycyclic aromatic hydrocarbons listed in Table A.1 of Annex A. This standard can also be used as a reference in the determination of polycyclic aromatic hydrocarbons in raw materials for coatings.
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 Paints, varnishes and raw materials for paints and varnishes—Sampling
GB/T 12806 Laboratory glassware—One-mark volumetric flasks
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
polycyclic aromatic hydrocarbons; PAHs
a series of hydrocarbon compounds and their derivatives fused by two or more benzene rings which may also have short alkyl or naphthenic substituents
4 Principle
The polycyclic aromatic hydrocarbons (PAHs) are extracted from samples by ultrasonic extraction with n-hexane as extraction solvent. The extraction solution is determined by the gas chromatograph-mass spectrometer (GC/MS) and quantified by external standard method.
Note: Other approved suitable solvents may also apply.
5 Reagents and materials
Unless otherwise specified, only reagents confirmed to be analytical grade and above are used in the analysis.
5.1 N-hexane: chromatographically pure.
5.2 The calibration compounds of PAHs (see Table A.1): the mass fraction shall not be less than 99%.
5.3 Mix standard stock solution: about 200μg/mL. Weigh about 0.02 g of each calibration compound of PAHs (5.2), accurate to 0.1 mg, put it in a 100 mL volumetric flask (6.6), and dilute it to the scale with n-hexane (5.1). Keep the standard stock solution under 4 °C in dark place for 3 months.
Note: The certified PAHs mixed standard solution with known concentration may also be used directly.
5.4 Helium: with purity greater than 99.999%.
6 Apparatus
6.1 Gas chromatograph-mass spectrometer (GC/MS): equipped with EI source.
6.2 Ultrasonic generator: with power ≥500 W.
6.3 Centrifuge: with the rotating speed of 3 000 r/min ~ 6 000 r/min, and the chamber temperature of not exceed 40°C during operation.
6.4 Balance: with an accuracy of 0.1 mg.
6.5 Sample bottle: with the capacity of about 15 mL, provided with sealable bottle cover.
6.6 Volumetric flask: brown, with a capacity of 25 mL and 100 mL, at Grade A of GB/T 12806.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Samples
8 Test procedures
9 Test data processing
10 Precision
11 Test report
Annex A (Informative) List of 16 PAHs
Annex B (Informative) Reference conditions for determination of 16 PAHs by gas chromatography-mass spectrometry
