GB/T 23986.2-2023Paints and varnishes - Determination of volatile organic compounds (VOC) and/or semi volatile organic compounds (SVOC) content - Part 2: Gas-chromatographic method (English PDF)

1 Scope

This document describes a method for the determination of VOC and/or SVOC content by gas chromatography:

This document applies to applications where the expected VOC and/or SVOC content is greater than 0:01% (mass fraction) and less than or equal to 100% (mass fraction):

Determination of VOC and SVOC content of several):

When the VOC content is greater than 15% (mass fraction), the method specified in ISO 11890-1 is used for measurement: According to ISO 11890-1

The measured VOC content may be affected by SVOC: Therefore, when the system contains VOC and SVOC, this document should be used:

(GB/T 23986:2) determination: When the VOC content is less than 0:1% (mass fraction), the headspace method described in ISO 17895 can also be selected:

Determination: ISO 11890-1 and ISO 17895 cannot be used to determine SVOC content:

Note 1: Some components of coatings and their raw materials may decompose during the analysis process, thereby producing artificial VOC and/or SVOC signals: Measuring paint

When measuring VOCs and/or SVOCs of their raw materials, these signals are artifacts produced by the method and will not be taken into account (see Appendix A for examples):

This method assumes that the volatile substance is water or organic matter, but there may also be other volatile inorganic substances: These inorganic substances may

Other suitable methods need to be used for quantification and taken into account in calculations: The methods specified in this document do not apply to moisture content

Determination:

Note 2: If there are organic acids or organic bases and their corresponding salts in the coating and its raw materials, this method may be used due to changes in the acid-base balance:

The results obtained by quantification are inaccurate:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document:

(generalmethod)]

Note: GB/T 6283-2008 Determination of moisture content in chemical products Karl Fischer method (general method) (ISO 760:1978, NEQ) oftestsamples)

Note: GB/T 20777-2006 Inspection and preparation of paint and varnish samples (ISO 1513:1992, IDT) ty)

Note 1: GB/T 6750-2007 Determination of density of paints and varnishes - Pycnometer method (ISO 2811-1:1997, IDT)

Note 2: GB/T 21862:2-2008 Determination of density of paints and varnishes Part 2: Falling ball method (ISO 2811-2:1997, IDT)

Note 3: GB/T 21862:3-2008 Determination of density of paints and varnishes Part 3: Vibration method (ISO 2811-3:1997, IDT)

GB/T 23988 | GB/T 23985 | GB/T 23987 | GB/T 23987.3 | GB/T 23981.2 | […]