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Status : Withdrawn
Standard Type : Main
Document No : ISO 1952:1976
Document Year : 1976
Pages : 2
Edition : 1
Section Volume : Coal and coke (ISO/TC 27.)
The sample of brown coal or lignite is extracted with boiling 0,005 N hydrochloric acid and the extract centrifuged. The sodium and potassium in solution are determined by any precise analytical method (for example, gravimetric method or flame photometric method).