ISO 16000-3:2022
Indoor air — Part 3: Determination of formaldehyde and other carbonyl compounds in indoor and test chamber air — Active sampling method
This document specifies a determination of formaldehyde (HCHO) and other carbonyl compounds (aldehydes and ketones) in air. The method is specific to formaldehyde but, with modification, at least 12 other aromatic as well as saturated and unsaturated aliphatic carbonyl compounds can be detected and quantified. It is suitable for determination of formaldehyde and other carbonyl compounds in the approximate concentration range 1 µg/m3 to 1 mg/m3. The sampling method gives a time-weighted average (TWA) sample. It can be used for long-term (1 h to 24 h) or short-term (5 min to 60 min) sampling of air for formaldehyde.
This document specifies a sampling and analysis procedure for formaldehyde and other carbonyl compounds that involves collection from air on to adsorbent cartridges coated with 2,4-dinitrophenylhydrazine (DNPH) and subsequent analysis of the hydrazones formed by high performance liquid chromatography (HPLC) with detection by ultraviolet absorption[12],[16]. The method is not suitable for longer chained or unsaturated carbonyl compounds.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Limitations and interferences
5.1 General
5.2 Ozone interference
6 Safety measures
7 Apparatus
7.1 Sampling
7.2 Sample preparation
7.3 Sample analysis
8 Reagents and materials
9 Preparation of reagents and cartridges
9.1 Purification of 2,4-dinitrophenylhydrazine
9.2 Preparation of DNPH formaldehyde derivative
9.3 Preparation of DNPH formaldehyde standards
9.4 Preparation of DNPH coated silica gel cartridges
9.4.1 General
9.4.2 DNPH coating solution
9.4.3 Coating of silica gel cartridges
10 Procedure
10.1 Sample collection
10.2 Process blanks
10.3 Sample analysis
10.3.1 Sample preparation
10.3.2 Sample desorption
10.3.3 HPLC calibration
10.3.4 HPLC analysis for formaldehyde
10.3.5 HPLC analysis of other aldehydes and ketones
11 Calculations
12 Performance criteria and quality assurance
12.1 General
12.2 Standard operating procedures (SOPs)
12.3 HPLC system performance
12.4 Sample loss
12.5 Measurement plan
13 Precision and uncertainty
14 Test report
Annex A (informative) Melting points of DNPH carbonyl derivatives
Annex B (informative) Precision and uncertainty
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Limitations and interferences
5.1 General
5.2 Ozone interference
6 Safety measures
7 Apparatus
7.1 Sampling
7.2 Sample preparation
7.3 Sample analysis
8 Reagents and materials
9 Preparation of reagents and cartridges
9.1 Purification of 2,4-dinitrophenylhydrazine
9.2 Preparation of DNPH formaldehyde derivative
9.3 Preparation of DNPH formaldehyde standards
9.4 Preparation of DNPH coated silica gel cartridges
9.4.1 General
9.4.2 DNPH coating solution
9.4.3 Coating of silica gel cartridges
10 Procedure
10.1 Sample collection
10.2 Process blanks
10.3 Sample analysis
10.3.1 Sample preparation
10.3.2 Sample desorption
10.3.3 HPLC calibration
10.3.4 HPLC analysis for formaldehyde
10.3.5 HPLC analysis of other aldehydes and ketones
11 Calculations
12 Performance criteria and quality assurance
12.1 General
12.2 Standard operating procedures (SOPs)
12.3 HPLC system performance
12.4 Sample loss
12.5 Measurement plan
13 Precision and uncertainty
14 Test report
Annex A (informative) Melting points of DNPH carbonyl derivatives
Annex B (informative) Precision and uncertainty
Bibliography