DIN EN ISO 17226-3:2011-09

This part of ISO 17226 specifies a method for determining the emission of formaldehyde from leathers. This method is based on high performance liquid chromatography (HPLC). It is selective and also allows the emission of other low molecular aldehydes and ketones to be observed. This part of ISO 17226 deals with the release of formaldehyde to the gas phase. Therefore, the obtained results are not comparable with the results of methods described in ISO 17226-1 and ISO 17226-2 which are based on extraction with liquid water. A specimen with defined dimensions is held above demineralized water in a sealed bottle and is heated at constant temperature for a specific period. Afterwards, the bottle is cooled and the formaldehyde absorbed into the water is analysed. The water is mixed with 2,4-dinitrophenylhydrazine, whereby aldehydes and ketones react to give the respective hydrazones. These are separated by means of a reversed-phase HPLC method, detected at 360 nm and quantified. This document (EN ISO 17226-3:2011) has been prepared by Technical Committee CEN/TC 289 "Leather", the secretariat of which is held by UNI (Italy) , in collaboration with the "International Union of Leather Technologists and Chemists Societies". The responsible national committee is Working Committee NA 062-05-52 AA "Chemische Prüfverfahren für Leder" ("Chemical test methods of leather") of the Materials Testing Standards Committee (NMP) at DIN.