Повучен
ISO 622:2016 specifies a reduced molybdophosphate photometric method for the determination of the total phosphorus content of hard coal, lignites and coke. Two methods for taking the phosphorus into solution are specified, namely extraction from the coal or coke ash with acid or by repeated oxidation of the coal or coke, by acid, to remove carbonaceous matter.
ПОВУЧЕН
ISO 622:1981
ПОВУЧЕН
ISO 622:2016
95.99
Повучен
25. 6. 2025.
ОБЈАВЉЕН
ISO 622:2025
Čvrsta mineralna goriva – Određivanje sadržaja fosfora – Fotometrijska metoda redukcije molibden-fosfatom
90.92 Одлука о измени или ревизији стандарда