Overview
EN ISO 14184-1:2011 (CEN adoption of ISO 14184-1:2011) specifies a standardized water extraction method for determining free and hydrolysed formaldehyde in textiles. The method is applicable to textile samples in any form and produces colorimetric results for formaldehyde concentrations in the practical range 16 mg/kg to 3 500 mg/kg. Results below 16 mg/kg are reported as “not detectable”. This part covers extraction, reaction with acetylacetone (Nash reagent) and spectrophotometric measurement.
Key topics and technical requirements
- Scope and limits: Intended range 16–3 500 mg/kg; lower limit 16 mg/kg (below this: “not detectable”).
- Sample preparation: Typical extraction uses approximately 1 g of cut textile pieces extracted with 100 ml water at (40 ± 2) °C for (60 ± 5) min, with regular shaking and subsequent filtration.
- Reagents: Analytical-grade water (ISO 3696), acetylacetone (Nash) reagent for color development; formaldehyde stock solutions prepared and standardized (Annex A).
- Analytical procedure: Mix aliquots of extract with Nash reagent, incubate (40 °C ~30 min then ambient ~30 min), and measure absorbance at 412 nm using a spectrophotometer capable of 3-decimal absorbance resolution.
- Calibration: Prepare standardized formaldehyde dilutions and construct a first-order regression (y = a + bx) for quantification; account for dilutions when samples exceed calibration range.
- Quality control: Run blanks, parallel tests, and correct for sample discoloration; conditioned masses and correction coefficients are described if needed.
Practical applications and users
- Who uses it: Textile testing laboratories, manufacturers, quality assurance teams, compliance officers, and regulators concerned with chemical safety and product labeling.
- Applications:
- Routine quality control of finished textiles, garments and home textiles.
- Verification of compliance with buyer specifications, national limits or ecolabel criteria for formaldehyde in textiles.
- Raw-material and process control to monitor formaldehyde from resins, finishing agents or contamination.
- Comparative testing during product development or remediations (washing/neutralization).
Related standards
- EN / ISO 14184-2:2011 - Determination of released formaldehyde (vapour absorption method).
- ISO 139 - Conditioning and testing atmospheres for textiles.
- ISO 3696 - Water for analytical laboratory use.
- ISO 4793 - Laboratory sintered filters (porosity grading).
Keywords: EN ISO 14184-1, formaldehyde in textiles, water extraction method, free and hydrolysed formaldehyde, Nash reagent, spectrophotometric determination, textile testing.
