ISO 11262:2011 PDF

Scope: This International Standard is applicable to as-received (field-moist) samples and specifies two different procedures for the liberation of cyanide from the soil: — direct liberation of hydrogen cyanide using orthophosphoric acid (normative); — extraction with sodium hydroxide solution and subsequent liberation using orthophosphoric acid (informative, see Annex B). The liberated cyanide is determined either by a photometric method or a titrimetric method using an indicator. The method is applicable to all types of soil. Under the conditions specified in this International Standard, the lower limit of application is 0,5 mg/kg of total cyanide (expressed on the as-received basis) for photometric determination and 10 mg/kg for titrimetric determination. NOTE Using the alkaline extraction followed by liberation using phosphoric acid, the lower limit of application is 1 mg/kg of total cyanide (expressed on the as-received basis) for photometric determination and 30 mg/kg for titrimetric determination.

ISO 11262:2011 Referenced Document

ISO 11464 Soil quality - Pretreatment of samples for physico-chemical analysis
ISO 11465 Soil quality; determination of dry matter and water content on a mass basis; gravimetric method; technical corrigendum 1
ISO 14507 Soil quality - Pretreatment of samples for determination of organic contaminants
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
ISO 9297 Water quality; determination of chloride; silver nitrate titration with chromate indicator (Mohr's method)