GB/T 40493-2021 English PDF (GBT40493-2021)

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GB/T 40493-2021: Determination of lead, cadmium, chromium and mercury content in the finishing material of wood-based panel
GB/T 40493-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 79.060.01
CCS B 70
Determination of Lead, Cadmium, Chromium and Mercury
Content in the Finishing Material of Wood-based Panel
人造板饰面材料中铅, 镉, 铬, 汞
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 1, 2022
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 Method Summary ... 4 
4 Reagents and Reference Materials ... 5 
5 Instruments and Materials ... 9 
6 Preparation of Specimens ... 10 
7 Extraction ... 10 
8 Determination of Extracting Solution ... 11 
9 Result Calculation ... 13 
10 Test Report ... 16 
Appendix A (informative) Working Conditions and Parameters of Microwave Digestion
Apparatus ... 17 
Appendix B (informative) Analysis Conditions of ICP Plasma Emission Spectrometer
... 18 
Appendix C (informative) Analysis Conditions of Atomic Absorption
Spectrophotometer ... 19 
Appendix D (informative) Analysis Conditions of Atomic Fluorescence Spectrometer
... 20 
Determination of Lead, Cadmium, Chromium and Mercury
Content in the Finishing Material of Wood-based Panel
1 Scope
This document describes the method of determining the content of heavy metal elements (lead,
cadmium, chromium and mercury) in the finishing material and finishing coat of wood-based
panel using inductively coupled (ICP) plasma emission spectrometer, atomic absorption
spectrophotometer and atomic fluorescence spectrometer, etc.
This document is applicable to the determination of the content of heavy metal elements in the
finishing material and finishing coat of wood-based panel.
2 Normative References
Through the normative references in this text, the contents of the following documents
constitute indispensable clauses of this document. In terms of references with a specified date,
only versions with a specified date are applicable to this document. In terms of references
without a specified date, the latest version (including all the modifications) is applicable to this
document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 21191 Atomic Fluorescence Spectrometer
JJG 015 Verification Regulation for Inductively Coupled Plasma - Atomic Emission
Spectrometer
JJG 023 Verification Regulation of Atomic Absorption Spectrometer
JJG 694 Atomic Absorption Spectrophotometer
3 Method Summary
3.1 Determination of Heavy Metal Elements Content
The specimen is digested through the wet method or microwave; the heavy metal elements are
transferred to the digestion solution. Adopt the ICP plasma emission spectrometry to determine
the spectral intensity of lead, cadmium, chromium and mercury in the digestion solution.
Alternatively, adopt the flame atomic absorption spectrometry to determine the spectral
intensity of lead, cadmium and chromium in the digestion solution; adopt the hydride generator
- cold atomic absorption spectrometry or atomic fluorescence spectrometry to determine the
spectral intensity of mercury in the digestion solution. In accordance with the spectral intensity,
conduct the quantitative determination.
3.2 Determination of Soluble Heavy Metal Elements Content
Under the conditions of specified temperature and time, use hydrochloric acid of a certain
acidity to extract the soluble heavy metal elements in the specimen. Adopt the ICP plasma
emission spectrometry to determine the spectral intensity of lead, cadmium, chromium and
mercury in the extracting solution. Alternatively, adopt the flame atomic absorption
spectrometry to determine the spectral intensity of lead, cadmium and chromium in the
extracting solution; adopt the hydride generator - cold atomic absorption spectrometry or
atomic fluorescence spectrometry to determine the spectral intensity of mercury in the
extracting solution. In accordance with the spectral intensity, conduct the quantitative
determination.
4 Reagents and Reference Materials
4.1 Test Water
The water used shall reach the requirements of distilled water or deionized water with above
Grade-2 purity specified in GB/T 6682.
4.2 Hydrofluoric Acid
With premium purity.
4.3 Hydrogen Peroxide (30%)
With premium purity.
4.4 Hydrogen Peroxide Solution (0.5%)
Hydrogen peroxide 0.5% (volume fraction).
4.5 Hydrochloric Acid
Density  = 1.19 g/mL, with premium purity.
4.6 Hydrochloric Acid Solution (1 mol/L)
Concentration c (HCl) = 1 mol/L.
4.7 Hydrochloric Acid Solution (0.07 mol/L)
Concentration c (HCl) = (0.07  0.005) mol/L.
4.8 Hydrochloric Acid Solution (5%)
brown volumetric flask. Use the hydrochloric acid solution (5%) (4.8) to dilute to the scale and
shake it well. In this mixed solution, the mass concentration of mercury is 100 g/L. Then, use
the hydrochloric acid solution (5%) (4.8) to stepwise dilute it to obtain a mixed standard
working solution with the mass concentrations of 25.0 g/L, 10.0 g/L, 5.0 g/L, 2.5 g/L, 1.0
g/L and 0.0 g/L.
5 Instruments and Materials
5.1 ICP plasma emission spectrometer: the instrument shall be able to provide a stable and clear
plasma torch; the stability of the instrument shall comply with the stipulations of JJG 015.
5.2 Atomic absorption spectrophotometer: with a continuous flow injection hydride generator,
equipped with quartz tube and lead, cadmium, chromium, mercury hollow cathode lamps; the
stability of the instrument shall comply with the stipulations of JJG 023 and JJG 694.
5.3 Atomic fluorescence spectrometer: equipped with a high-intensity mercury hollow cathode
lamp; the stability of the instrument shall comply with the stipulations of GB/T 21191.
5.4 Microwave digestion apparatus: equipped with PTFE digestion tank. Before use, the
digestion tank needs to be soaked in the nitric acid solution (4.10) for 24 h, then, washed with
water and dried.
5.5 Balance: with a division value of 0.1 mg.
5.6 Constant-temperature oscillating water bath: can maintain the temperature at (37  2) C;
the oscillation frequency is 60 times/min.
5.7 pH tester: with an accuracy of  0.1 pH unit.
5.8 Metal mesh sieve: with an aperture of 0.5 mm.
5.9 Scraper: a tool with a sharp blade, suitable for scraping the surface material of the specimen.
5.10 Mortar: before use, it needs to be washed with the nitric acid solution (4.10) and dried.
5.11 Pipette: 1 mL, 2 mL, 5 mL, 10 mL and 25 mL.
5.12 Brown volumetric flask: 25 mL, 50 mL, 100 mL and 1,000 mL. Before use, it needs to be
soaked in the nitric acid solution (4.10) for 24 h, then, washed with water and dried.
5.13 Triangular flask with a stopper: 50 mL and 100 mL. Before use, it needs to be soaked in
the nitric acid solution (4.10) for 24 h, then, washed with water and dried.
5.14 Aqueous membrane filter: with an aperture of 0.45 m.
6 Preparation of Specimens
6.1 Preparation of Finishing Material Specimens
Before specimen preparation, the impregnated adhesive film paper shall be suspended and
placed in a blast drying oven at 170 C for 15 min, then, cooled at room temperature for 1 h.
Make the impregnated adhesive film paper, thermosetting resin-impregnated paper high-
pressure decorative laminate (HPL) and polyvinyl chloride (PVC) film and other finishing
materials into a fragment with an area of less than 25 mm2. Take this fragment as a specimen;
after mixing, divide it into two equal parts;...