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ISO 14388-3:2014

Current
Current

The latest, up-to-date edition.

Soil quality Acid-base accounting procedure for acid sulfate soils Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

French, English

Published date

24-07-2014

ISO 14388-3:2014 specifies a suite of methods used to determine net acidity in acid sulfate soils. ISO 14388-3:2014 specifies a method for the determination of pH in a 1 mol/l potassium chloride soil suspension (pHKCl) and where required, titratable actual acidity (TAA). Following this, potassium chloride extractable sulfur (SKCl), calcium (CaKCl) and magnesium (MgKCl) are determined. On a separate test portion, following digestion with 30 % hydrogen peroxide, peroxide pH (pHOX), titratable peroxide acidity (TPA) and excess acid neutralizing capacity (ANCE) are determined. Following this, peroxide sulfur (SP), calcium (CaP) and magnesium (MgP) are determined. On samples where jarosite is present, or where pHKCl is < 4,5, residual acid soluble sulfur (SRAS) is determined on the soil residue remaining after peroxide digestion. Titratable sulfidic acidity (TSA), reacted calcium (CaA), reacted magnesium (MgA) and peroxide oxidizable sulfur (SPOS) are then determined by difference. For peat samples containing substantial levels of organic sulfur, the SPOCAS suite is generally unsuitable for estimating sulfide content, and the chromium reducible suite of procedures should be used instead.

DevelopmentNote
Supersedes ISO/DIS 14388-3. (07/2014)
DocumentType
Standard
Pages
21
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
NF ISO 14388-3 : 2014 Identical
BS ISO 14388-3:2014 Identical

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