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)

Foreword

This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents"

Drafting:

This document is GB/T 23986 "Volatile organic compounds (VOC) and/or semi-volatile organic compounds in paints and varnishes"

Determination of (SVOC) Content》Part 2: GB/T 23986 has released the following parts:

---Part 2: Gas Chromatography:

This document replaces GB/T 23986-2009 "Determination of Volatile Organic Compounds (VOC) Content in Paints and Varnishes by Gas Chromatography"

"Law", compared with GB/T 23986-2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) Changed the "scope" (see Chapter 1, Chapter 1 of the:2009 edition);

b) Added "semi-volatile organic compounds", "non-volatile organic compounds", "semi-volatile organic compounds content" and "internal standards"

Terms and definitions of "substitute calibrator", "marker", "retention time", "extraction solvent", "main peak", "secondary peak" and "reagent" (see Section 3

Chapter); change "to be tested" to "to be used" (see 3:7, 3:4 of the:2009 version);

c) Changed the "principle" (see Chapter 4, Chapter 4 of the:2009 edition);

d) Changed "required supplementary information" to "required information" and changed the corresponding content (see Chapter 5, Chapter 5 of the:2009 edition

and Appendix A);

e) "Gas Chromatograph" (see 6:1, 6:1 and 6:2 of the:2009 edition), "Detector" (see 6:3, 6:4 of the:2009 edition), "Gas Chromatograph" (see 6:3, 6:4 of the:2009 edition), "Glass

"Slim tube column" (see 6:4, 6:5 in the:2009 edition), "Qualitative analysis equipment" (see 6:6, 6:6 in the:2009 edition); "Analysis system" was added

"Performance indicators of the system" (see 6:5) and "Data processing" (see 6:8); deleted "Graph recorder" (see 6:8 in the:2009 version) and

"Integrator" (see 6:9 of the:2009 edition);

f) "Standard compound" was changed to "calibrator", and the corresponding requirements were changed (see 7:6, 7:2 of the:2009 version), and the "internal standard" was changed:

"substance" (see 7:2, 7:1 of the:2009 edition), "marker" (see 7:4, 7:4 of the:2009 edition), "extraction solvent" (see 7:7,:2009 edition of

Version 7:3); Added "General Principles" (see 7:1), "Substitute Calibrants" (see 7:3), and "Performance Index Compounds" (see 7:5);

g) Change "Quantitative determination of compound content" to "Data collection for sample measurement", and change the corresponding requirements (see 8:2:2,:2009

9:7 of the:2009 edition), changed "Sampling" (see 8:1, Chapter 8 of the:2009 edition) and "Sample Preparation" (see 8:2:1, Chapter 8 of the:2009 edition)

9:6), "Calibration" (see 8:3, 9:5 of the:2009 edition), "Gas Chromatography Conditions" (see 8:5, 9:3 of the:2009 edition), "Moisture content"

(See 8:7, 9:2 of the:2009 version); Added "Quality Assurance" (see 8:4);

h) Added "Data Analysis" (see Chapter 9);

i) Added "Quantitative determination of compound content" (see Chapter 10);

j) Added the calculation formulas for VOC content and SVOC content (see 11:6);

k) Changed "Representation of results" to "Data evaluation and calculation of final results", and changed the corresponding content (see Chapter 12,:2009

version of Chapter 11);

l) "Precision" has been changed (see Chapter 13, Chapter 12 of the:2009 edition);

m) Changed the "Test Report" (see Chapter 14, Chapter 13 of the:2009 edition):

This document is modified using ISO 11890-2:2020 "Volatile organic compounds (VOC) and/or semi-volatile organic compounds in paints and varnishes"

Determination of compound (SVOC) content Part 2: Gas chromatography method:

Compared with ISO 11890-2:2020, this document has made the following structural adjustments:

---6:1:1 corresponds to 6:1 in ISO 11890-2:2020;

---6:1:2 corresponds to 6:1:1 in ISO 11890-2:2020;

---6:1:3 corresponds to 6:1:2 in ISO 11890-2:2020;

---6:1:4 corresponds to 6:1:3 in ISO 11890-2:2020;

---Changed the format of the detector description in 6:3 to column items;

---Appendix A corresponds to Appendix B in ISO 11890-2:2020;

---Appendix B corresponds to Appendix C in ISO 11890-2:2020;

---Appendix C corresponds to Appendix A in ISO 11890-2:2020:

The technical differences between this document and ISO 11890-2:2020 and their reasons are as follows:

--- Added the method of measuring moisture content in coatings using ISO 23168 (see 8:7), increasing the success rate of widespread use in my country's coatings industry

methods to improve the applicability of this document;

---Added sample weighing accuracy requirements (see 8:2:1) to improve the operability of this document;

---Added the calculation method of VOC content and/or SVOC content (mass fraction) of "ready-to-use" products after deducting water (see

11:6), adapt to the usage habits of relevant fields in my country to improve the applicability of this document:

The following editorial changes have been made to this document:

---A description of the method has been added to the scope;

---Standardizes the presentation of long-chain alkane compounds in this document;

--- Added Note 3 in 8:7, optimized the precision, and explained the simplified processing of trace moisture content in the extraction solvent;

---Changed the item number in 9:1;

---Changed the editorial error in Figure 4, changing "VOC markers < TR <=VOC markers" to "VOC markers < TR

<=SVOC markers";

---Deleted the "%" in "in" of formula (4) and formula (5);

---The error in the unclear expression of the acetonitrile extraction solution component ratio in Figure B:3 of ISO 11890-2:2020 has been changed, and the "correct" error has been changed:

"Hexane: acetonitrile = 4:1" was changed to "n-hexane: acetonitrile = 4:1 (volume ratio)" (see Figure A:3);

---Changed the description of the column oven temperature program in the chromatographic conditions of 1-dodecanol in ISO 11890-2:2020B:4, replacing "initial temperature

50 degrees C, constant temperature for 5min, increase to:200 degrees C and 320 degrees C at 5 degrees C/min and 20 degrees C/min, keep for 7min and 0min" change

It is "initial temperature 50 degrees C, constant temperature for 5min, rise to:200 degrees C at a heating rate of 5 degrees C/min, and maintain for 7min; or initial temperature

50°C, constant temperature for 5 minutes, rise to 270°C at a heating rate of 20°C/min, hold for 0 minutes"; changed the editing of the final temperature of the column oven

If there is a sexual error, change the final temperature of the column oven from "320 degrees C" to "270 degrees C"; if there is an error of changing the detector temperature condition, change "and" to "270 degrees C":

"or" (see A:5);

---Changed the format of chromatographic conditions in ISO 11890-2:2020 Appendix B and Appendix C to listed items; changed the split ratio

Description, change it to note (see Appendix A and Appendix B);

---Add a description indicating the terms represented in Table D:1 in Appendix D, and change "determine the precision of this test method" to

"Determine the precision of this test method (see Table D:1)"; changed the editorial error in Appendix D, replacing "3 VOCs"

Change to "3 or 4 VOCs":

Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:

Introduction

This document is one of a series of standards for the sampling and testing of coatings and their raw materials: This document describes the determination of volatile emissions from coatings and their raw materials:

Volatile organic compound content (VOC) and semi-volatile organic compound content (SVOC): GB/T 23986 "Paints and varnishes

"Determination of Volatile Organic Compounds (VOC) and/or Semi-Volatile Organic Compounds (SVOC)" aims to provide guidance for coatings and their raw materials in my country:

The control of VOC and SVOC provides internationally accepted and reliable testing methods to promote the development of the coating industry in the direction of low pollution: It is planned to be composed of two

Partial composition:

---Part 1: Gravimetric determination of VOC: GB/T 23985 is revised to GB/T 23986:1, which is applicable to the gravimetric determination of coatings:

VOC content in materials:

---Part 2: Gas Chromatography: GB/T 23986 is revised to GB/T 23986:2, which is suitable for the determination of coatings by gas chromatography:

VOC and/or SVOC content in the material:

Paints and Varnishes Volatile Organic Compounds (VOCs) and/or

or semi-volatile organic compounds (SVOC) content

Determination Part 2: Gas Chromatography

Warning---The use of this document may involve hazardous materials, operations, and equipment: This document is not intended to address all safety aspects associated with the use of

question: Users of this document are responsible for taking appropriate steps to ensure the safety and health of personnel and to identify any other

The applicability of his restrictions:

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)