GB/T 45245-2025 Determination method of total organic carbon in wood-based panels and finishing products
1 Scope
This document describes a determination method for the total organic carbon (TOC) in wood-based panels and finishing products by non-dispersive infrared (NDIR) absorption spectrometry, involving reagents, apparatus, specimen preparation, determination procedure, data processing and result presentation, and reporting.
This document applies to the determination of total organic carbon in wood-based panels and finishing products.
This document is not applicable to the determination of total organic carbon in wood-based panels and finishing products containing carbonate minerals as the main primary additive.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 18259-2018 Terminology for wood-based panels and their surface decoration
GB/T 36055-2018 Method for analysis of forestry biomass - Determination of moisture content
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 18259-2018 and the following apply.
3.1
wood-based panel
panel or formed product composed of material units mainly made from wood or non-wood plant fibers, with or without adhesive and any other additive applied
Note: Mainly including plywood, particleboard, and fiberboard.
[Source: GB/T 18259-2018, 2.1]
3.2
total carbon
total content of elemental carbon in a wood-based panel and finishing product
Note: Including organic carbon content and inorganic carbon content.
3.3
total organic carbon
total content of elemental carbon existing in organic form in a wood-based panel and finishing product
3.4
total inorganic carbon
total content of elemental carbon existing in inorganic form in a wood-based panel and finishing product
Note: Including elemental carbon in the form of carbonate or bicarbonate.
4 Method description
A proper amount of specimen of a wood-based panel and finishing product is oxidized into carbon dioxide gas under high-temperature oxygen-rich conditions. The gas is introduced into a non-dispersive infrared detector for it to measure the infrared absorption spectrum intensity. The total carbon is quantitatively measured by external standard method.
In the wood-based panel and finishing product, when the total inorganic carbon is below the allowable error in the total carbon measurement result, the total organic carbon is represented as the total carbon.
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Method description
5 Reagents
6 Apparatus
7 Specimen preparation
8 Determination procedure
9 Data processing and result representation
10 Report
Annex A (Informative) Reference values of total inorganic carbon in typical wood-based panels and finishing products
