UNI 3306 : 1953
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
PROCEDURES FOR CHEMICAL ANALYSIS OF METALS - DETERMINATION OF THE NICKEL IN FERRONICKEL AND IN NICKEL METAL - GRAVIMETRIC METHOD
12-31-1997
05-31-1953
Si rende insolubile la silice evaporando la soluzione nitrica del campione sino a fumi bianchidi acido perclorico e si filtra. Si separa il nichel nel filtrato leggermente ammoniacale precipitandolo con soluzione alcoolica di dimetilgliossima, in presenza di citrato di ammonio per mantenere in soluzione il ferro, e si pesa la nicheldimetilgliossima. Soluzioni e reattivi. Procedimento. Calcolo.
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