Numéro de référence
ISO 3361:1975
ISO 3361:1975
© ISO 2024
ISO 3361:1975
Acide phosphorique à usage industriel — Dosage de la silice soluble — Méthode spectrophotométrique au molybdosilicate réduit
Edition 1
1975-07
1975-07
Annulée
Résumé
Specifies a reduced molybdosilicate spectrophotometric method for the determination of the soluble silica content of phosphoric acid for industrial use. The method can be used for the determination of 1 µg of soluble silica in the presence of 20 mg of phosphorus pentoxide. It is thus, for example, applicable to the determination of soluble silica contents greater than 30 mg/kg if the phosphoric acid contains 60 % of phosphorus pentoxide.