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GB/T 39931-2021 English PDF (GBT39931-2021)

GB/T 39931-2021 English PDF (GBT39931-2021)

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GB/T 39931-2021: Volatile organic compounds from wooden furniture -- On-site and rapid detection method

This Standard specifies terms and definitions, principle, reagents, instruments, test steps for on-site and rapid detection method for volatile organic compounds from wooden furniture. This document is applicable to on-site and rapid detection for volatile organic compounds from wooden furniture.
GB/T 39931-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 97.140
CCS Y 80
Volatile organic compounds from wooden furniture -
On-site and rapid detection method
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 5
5 Reagents ... 5
6 Instruments ... 5
7 Test steps ... 7
Volatile organic compounds from wooden furniture -
On-site and rapid detection method
1 Scope
This Standard specifies terms and definitions, principle, reagents, instruments, test steps for on-site and rapid detection method for volatile organic compounds from wooden furniture.
This document is applicable to on-site and rapid detection for volatile organic compounds from wooden furniture.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 18204.2-2014, Examination methods for public places - Part 2:
Chemical pollutants
GB/T 28202-2020, Furniture industry terminology
GB/T 31106-2014, Determination of volatile organic compounds in furniture GB/T 39763, Technical requirements of on-site and rapid collection
equipment of volatile organic compounds from furniture
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 28202-2020, GB/T 31106-2014 as well as the followings apply.
3.1 wooden furniture
except for the decorative parts and accessories in the main components, the rest are furniture made of wood, artificial boards and other wooden materials [Source: GB/T 28202-2020, 2.1.2]
5 - Air inlet;
6 - Bracket for pressing;
7 - Right suction cup;
8 - Gas inlet;
9 - Gas tube;
10 - Left suction cup;
11 - Exhaust port;
12 - Sampling hood;
13 - VOCs rapid analyzer;
14 - Surface of wooden furniture.
Figure 1 -- On-site rapid detection equipment for volatile organic
compounds from wooden furniture
6.2 On-site rapid collection equipment for VOCs from wood furniture
The on-site rapid collection equipment for VOCs from wood furniture shall comply with the provisions of GB/T 39763.
6.3 Rapid analyzer for VOCs from wood furniture
6.3.1 Formaldehyde rapid analyzer
The minimum resolution of formaldehyde rapid analyzer is 0.01mL/m3. The measuring range is 0.01mg/m3~0.60mg/m3. The uncertainty shall be less than 20%. The response time t95% ???3min. Use formaldehyde standard gas or phenol reagent spectrophotometry (7.2 in GB/T 18204.2-2014) to compare and test the instrument. The relative deviation is ???15%.
6.3.2 Other rapid analyzers for aldehydes and ketones
Rapid analyzer for aldehydes and ketones VOCs: portable gas chromatography, equipped with photoionization detector (PID). The measuring range of single aldehyde and ketone VOCs is 1??mol/mol~100??mol/mol. The indication error is not more than 10%. The uncertainty shall be less than 20%. The detection limit of acetaldehyde and acrolein when quantitatively collecting 1L of gas meets the requirements of Table 1.
NOTE: Other portable chromatographs that meet the detection requirements can also be used.
6.3.3 Non-aldehyde and ketone rapid analyzer
Non-aldehyde and ketone VOCs rapid analyzer: portable gas chromatography, equipped with FID detector. The measuring range of single non-aldehyde and ketone VOCs is 0.5??mol/mol~100??mol/mol. The indication error is not more than 10%. The uncertainty shall be less than 20%. The detection limit of non- By adjusting the control system of on-site rapid collection equipment for VOCs from wooden furniture, set the temperature, flow, time and other technical parameters required for the test. Through the interface, connect the on-site rapid collection equipment for VOCs from wooden furniture with the rapid analyzer for VOCs from wooden furniture. It shall be ensured that the interface is leak-free and the air path is unobstructed.
Start the rapid analyzer for VOCs from wooden furniture. Perform power-on calibration. Complete the analyzer preparation.
7.3 Background concentration purge
Close the sampling hood of the on-site rapid collection equipment for VOCs from wood furniture (position 8 in Figure 1). Open the air inlet (position 5 in Figure 1) and exhaust port (position 11 in Figure 1). At an air inlet rate of 1L/min, purge nitrogen with a purity of 99.999% into the sampling hood. The time shall not be less than 9min. Ensure that the air in the hood is replaced with high- purity nitrogen, and the background concentration purging is completed. 7.4 Load retention
After the background concentration in the sampling hood of the on-site rapid collection equipment for VOCs from wooden furniture is purged clean,
simultaneously close the air inlet (position 5 in Figure 1) and exhaust port (position 11 in Figure 1). The sampling hood is kept tightly closed for 10min. Enrich the VOCs released from the surface of wooden furniture into the
sampling hood.
7.5 Sampling and rapid analysis of VOCs
7.5.1 General
The rapid analysis of formaldehyde (7.5.2) does not need to be separated and enriched due to the small sampling amount. It can be sampled from the rapid analysis of other aldehydes and ketones VOCs (7.5.3) or non-aldehydes and ketones VOCs rapid analysis (7.5.4).
The rapid analysis of other aldehydes and ketones VOCs (7.5.3) and the rapid analysis of non-aldehydes and ketones VOCs (7.5.4) shall be collected
separately and sampled after enrichment.
7.5.2 Rapid analysis of formaldehyde
After load retention, turn on the formaldehyde rapid analyzer (including sampling pump and flow meter) within 30s. Rapidly collect the VOCs from wood furniture and analyze the gas in the sampling hood of the equipment. The reading displayed on the formaldehyde rapid analyzer is the formaldehyde

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