Numéro de référence
ISO 2750:1974
ISO 2750:1974
© ISO 2024
ISO 2750:1974
Urée à usage industriel — Détermination de la coloration d'une solution urée-formaldéhyde, en unité Hazen (échelle platine-cobalt)
Edition 1
1974-08
1974-08
Annulée
Résumé
Lays down the principle of the visual comparison of the colour of a solution of the sample in formaldehyde, stabilized at a pH of 10 0.1, with that of colour standards. Expression of the results in terms of Hazen units. For routine control purposes, referring to ISO 2211. The method has also been approved by the IUPAC.