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Determination of formaldehyde content in leather: Standard EN ISO 17226, revision and possible improvements Cuadros Domènech, Sara Font Vallès, Joaquim Cuadros Domènech, Rosa Maria Izquierdo, Francina Ollé Otero, Lluís Marsal Monge, Agustín Escola d'Enginyeria d'Igualada Universitat Politècnica de Catalunya. Departament d'Enginyeria Química Universitat Politècnica de Catalunya. Càtedra A3 ENGIBIO - Càtedra A3 d’Innovació en Cuir, Moda i Tèxtils Àrees temàtiques de la UPC::Enginyeria química::Indústries químiques::Química tèxtil Àrees temàtiques de la UPC::Enginyeria tèxtil Formaldehyde Leather Tanning Standards Formaldehid Cuir Adoberia -- Normes The retanning process is the main application of formaldehyde in the tanning industry since formaldehyde participates in two groups of synthetic organic tanning agents: syntans and resins. Resins can be hydrolysed with the result that formaldehyde is released. Thus, formaldehyde in leather can be free or from hydrolysis of resins. Due to the carcinogenic character of formaldehyde, its presence in leather should be avoided or should be below allowable limits. The EN ISO 17226 Standard is the Official Standard for the determination of formaldehyde content in leather, which, in the authors’ opinion, presents certain ambiguities in the wording of some operations included in their analysis methods and, some of these operations, are susceptible of improvement. Therefore, a revision of the EN ISO 17226 Standard (Parts 1 and) 2 is carried out in this work and, in particular, of the extraction phase of formaldehyde present in leather (possible use of alternative surfactant and shaking method); reaction time between the extracted formaldehyde with the dinitrophenylhydrazine solution (Part 1 of the Standard) and stability of the acetylacetone solution (Part 2 of the Standard). Peer Reviewed Postprint (published version) 2016-07 Article Cuadros Domènech, S., Font Vallès, Joaquim, Cuadros, R., Izquierdo, F., Olle, L., Marsal , A. Determination of formaldehyde content in leather: Standard EN ISO 17226, revision and possible improvements. "Journal of the Society of Leather Technologists and Chemists", Juliol 2016, vol. 100, núm. 4, p. 167-174. 0144-0322 https://hdl.handle.net/2117/90238 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy 8 p. application/pdf