Brown coals and lignites -- Method of extraction for the determination of sodium and potassium soluble in dilute hydrochloric acid
This standard has been revised by ISO 1952:2008
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).
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