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BS EN ISO 7012-1:2025 Paints and varnishes. Determination of preservatives in water-dilutable coating materials - Determination of in-can free formaldehyde >
BS EN ISO 7012-1:2025 Paints and varnishes. Determination of preservatives in water-dilutable coating materials - Determination of in-can free formaldehyde, 2025
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- 4.1 General
- 4.2 Equilibria of in-can free formaldehyde in the coating matrix
- 4.3 Equilibria of in-can free formaldehyde during extraction
- 4.4 Equilibria of in-can free formaldehyde during derivatization
- 4.5 Principle of Method A: Derivatization with acetylacetone (ACAC) combined with photometric detection [Go to Page]
- 4.6 Principle of Method B: Derivatization with dinitrophenylhydrazine (DNPH) combined with liquid chromatography (LC) separation and UV/VIS detection [Go to Page]
- 4.7 Principle of Method C: Liquid chromatography (LC) separation followed by post-column derivatization with ACAC and subsequent quantification with UV/VIS detection [Go to Page]
- 5.1 General
- 5.2 General apparatus
- 5.3 Apparatus for extraction
- 5.4 Apparatus for method A
- 5.5 Apparatus for method B [Go to Page]
- 5.6 Apparatus for method C [Go to Page]
- 6.1 General
- 6.2 General reagents [Go to Page]
- 6.3 Method A: Reagents for derivatization with ACAC
- 6.4 Method B: Reagents for derivatization with DNPH
- 6.5 Method C: Reagents for post-column derivatization with ACAC
- 6.6 Reagents for titration of formaldehyde standard
- 7.1 Sampling
- 7.2 Extraction
- 7.3 Analysis and detection of Method A [Go to Page]
- 7.4 Analysis and detection of Method B [Go to Page]
- 7.5 Analysis and detection of Method C [Go to Page]
- 8.1 General
- 8.2 Repeatability limit, r
- 8.3 Reproducibility limit, R [Go to Page]