Free Formaldehyde by Acetylacetone Method
topic
The acetylacetone colorimetric method extracts free formaldehyde from textile specimens with water at 40 degrees Celsius for one hour, reacts the extract with acetylacetone and ammonium acetate to form the yellow diacetyldihydrolutidine chromophore, and measures absorbance at 412 nanometres against a calibration curve; ISO 14184-1 defines this as the reference method for free formaldehyde detection.
Role
Primary analytical method for free formaldehyde compliance testing in cotton, linen, and blended fabrics treated with N-methylol durable press resins, enabling quantification against the tiered OEKO-TEX limits of 20 milligrams per kilogram for baby products, 75 for skin contact, and 300 for non-skin contact textile product classes.