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Testing facility for determination of total in-can formaldehyde according to VdL-Guideline 03

Posted Date:2025/11/25

5.2.Acid steam distillation

(Determination of total in-can formaldehyde)

–Steam distillation apparatus, e.g. Vapodest 20s (Gerhard brand)

–Volumetric flasks 250 ml

–Precision balance, resolution of at least 0.001 g

–Spectrophotometer, suitable for a wavelength of 412 nm

–Graduated cylinder, 25 ml, with ground joint

–Suitable pipettes

–Suitable cuvettes

- Sulphuric acid 25% (v/v),

e.g. made up from 839 ml deionised water and 160 ml conc. sulphuric acid

–Acetyl acetone reagent for a volume of 500 ml aqueous solution:

–75 g ammonium acetate p.a.

–1 ml acetylacetone (2,4-pentandione) p.a.

–1.5 ml acetic acid 100% p.a.

–Fill up to 500 ml with deionised water

–Deionised water

Note:

The acetyl acetone reagent is not stable. If kept at room temperature, it may be used for testing for no longer than 14 days.