BS EN ISO 14254:2011 PDF

Scope: This International Standard specifies a method for the determination of exchangeable acidity in barium chloride extracts of soil samples obtained according to ISO 11260. The procedure described herein mainly concerns the determination of total exchangeable acidity by means of a fixed-pH end-point titration (see note). Two optional procedures are also given, describing respectively, determinations of free H acidity and of aluminium in the extracts. This International Standard is applicable to all types of air-dry soil samples which have been pretreated in accordance with ISO 11464. NOTE Titration of exchangeable acidity by means of a fixed-pH end-point may not be specific to a given acid species. The endpoint pH value retained is 7,8, corresponding to complete precipitation of Al ions in synthetic solutions. Titration of soil extracts to this pH may also include some more weakly ionized species or weak acid organic compounds.

BS EN ISO 14254:2011 Referenced Document

ISO 11260 Soil quality - Determination of effective cation exchange capacity and base saturation level using barium chloride solution*， 2018-05-01 Update
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 3696 Water for analytical laboratory use; Specification and test methods

2018 BS EN ISO 14254:2018 Soil quality. Determination of exchangeable acidity using barium chloride solution as extractant
2011 BS EN ISO 14254:2011 Soil quality. Determination of exchangeable acidity in barium chloride extracts