GB/T 38723-2020Determination of emission rate of volatile organic compounds from wooden furniture—Concentration history method (English PDF)

1 Scope

This Standard specifies the principle, terms and definitions, test methods and result calculation for concentration history testing method of emission rate of formaldehyde, benzene, toluene, xylene, total volatile organic compounds (TVOC) in wooden furniture.

This Standard is applicable to testing of emission rate of formaldehyde, benzene, toluene, xylene, total volatile organic compounds (TVOC) in wooden furniture. The testing of emission rate of other volatile organic compounds may refer to this Standard.

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 18584, Indoor decorating and refurbishing materials - Limit of harmful substances of wood based furniture

GB/T 18801-2015, Air Cleaner

GB/T 31106-2014, Determination of volatile organic compounds in furniture

GB/T 31107, Environmental chamber for the determination of volatile organic compounds of furniture - General technical requirements

GB/T 35607, Green product assessment - Furniture

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB18584, GB/T 31106-2014, GB/T 31107, GB/T35607 as well as the followings

5 Test methods

6 Result representation

According to the results of the concentration of volatile organic compounds obtained by determination and analysis, according to formula (1), the concentration and time of each target volatile organic compound in the chamber are respectively linearly fitted. The slope is a0 (R2>=0.90). If R2 is less than 0.90, and the concentration at the initial moment of the closed phase is lower than the 0.5th hour concentration result, sequentially obtain the slope between the target volatile organic compound concentration at each time and the concentration at the initial time of the closed phase. Take the maximum value as a1. If R2 is less than 0.90, and the initial concentration of the closed phase is higher than the 0.5th hour concentration result, then sequentially obtain the slope between the concentration at each time after the 0.5th hour and the concentration at the 0.5th hour. Take the maximum value as a2. See Annex A for R2 calculation method and fitting example. The calculation result keeps three decimal places.

Where, a0 - Linear fit slope, in milligrams per cubic meter hour [mg/(m3·h)];

rho t - Target volatile organic compound concentration in the climate chamber, in milligrams per cubic meter (mg/m3); t - Time the sample is placed in the climate chamber, in hours (h); b - Linear fit intercept, in milligrams per cubic meter (mg/m3).

The emission rate per area of target volatile organic compound of wood furniture samples is calculated according to formula (2): […]