Detail of GB/T 40971-2021

Introduction of GB/T 40971-2021

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents. Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights. This standard was proposed by the China National Light Industry Council. This standard is under the jurisdiction of the National Technical Committee 480 on Furniture of Standardization Administration of China (SAC/TC 480). Methods for the determination of prohibited substance in furniture products and related materials - Polycyclic aromatic hydrocarbons WARNING — Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This document describes the gas chromatography-mass spectrometry (GC-MS) determination method for 18 varieties of polycyclic aromatic hydrocarbons (PAHs) in furniture products and related materials. This document is applicable to the determination of 18 varieties of PAHs in furniture products and related materials. 2 Normative references No normative reference is listed in this document. 3 Terms and definitions For the purposes of this document, 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 on which there may also be short alkyl or cycloalkyl substituents Notes: See Table A.1 in Annex A for the 18 varieties of PAHs. 4 Principle The specimen is subjected to ultrasonic extraction with toluene, purified by silica solid phase extraction column, and then concentrated to volume. After that, it is determined by gas chromatography-mass spectrometry (GC-MS) and quantified by external standard method in the selective ion monitoring mode. 5 Reagents or materials 5.1 n-Hexane: chromatographically pure. 5.2 Petroleum ether: chromatographically pure. 5.3 Methylbenzene: chromatographically pure. 5.4 Nitrogen: with a purity of 99.99% or better. 5.5 Helium: with a purity of 99.999% or better. 5.6 Reference materials of 18 varieties of PAHs: with a purity of 98% or better; or certified mixed standard solution of the 18 varieties of PAHs with their concentrations known. 5.7 Mixed standard working solution of the 18 varieties of PAHs: at least 5 calibration points, covering samples with a concentration ranging from 0.2 mg/kg to 10 mg/kg. That is, the concentration of the standard solution ranges from 10 ng/mL to 500 ng/Ml. This mixed standard working solution of PAHs shall be sealed and stored in a place away from light at 0℃~4℃. 5.8 Silica solid phase extraction column: 2g/10 mL or equivalent, soaked with n-hexane before use. 5.9 Centrifuge tube. 5.10 Sample bottle: about 50 mL in volume, provided with a cover for seal. 5.11 Membrane: organic syringe membrane, with an aperture of 0.45 μm.

Contents of GB/T 40971-2021

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents or materials 6 Apparatus 7 Samples 8 Test procedure 9 Test data processing 10 Precision Annex A (Informative) Molecular formula, CAS No. and characteristic fragment ions of 18 varieties of PAHs Annex B (Informative) Typical GC-MS selective ion chromatograms of 18 varieties of PAHs