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ISO 14388-2:2014

Current
Current

The latest, up-to-date edition.

Soil quality Acid-base accounting procedure for acid sulfate soils Part 2: Chromium reducible sulfur (CRS) methodology
Available format(s)

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

Language(s)

English, French

Published date

07-24-2014

ISO 14388-2:2014 specifies a suite of methods used to determine the net acidity in acid sulfate soils. ISO 14388-2:2014 specifies a method for measuring chromium reducible sulfur (SCR) by iodimetric titration of distilled hydrogen sulfide trapped as zinc sulfide, following acidic chromous chloride digestion. This method determines inorganic sulfides (e.g. pyrite, marcasite, greigite, mackinawite) and elemental sulfur in acid sulfate soil without interferences from organic sulfur and oxidized forms of sulfur such as sulfate.

On a separate test portion of soil, the pH in a 1 mol/l KCl soil suspension (pHKCl) is determined. When pHKCl is < 6,5, titratable actual acidity (TAA) is then determined. Subsequently, potassium chloride extractable sulfur (SKCl), calcium (CaKCl), and magnesium (MgKCl) can also be determined. Where jarosite is identified in the soil (or where pHKCl is < 4,5), net acid-soluble sulfur (SNAS) is determined by the difference between hydrochloric acid extractable sulfur (SHCl) and potassium chloride extractable sulfur. On samples where pHKCl is < 6,5, acid neutralizing capacity is determined by measuring either inorganic carbon (CIN) by combustion furnace, or ANCBT (ANC measured by back-titration of acid remaining following an acid digest).

DevelopmentNote
Supersedes ISO/DIS 14388-2. (07/2014)
DocumentType
Standard
Pages
18
ProductNote
THIS STANDARD ALSO HAVE CORRECT VERSION FOR FR:2014
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
NF ISO 14388-2 : 2014 Identical
BS ISO 14388-2:2014 Identical

BS ISO 14388-1:2014 Soil quality. Acid-base accounting procedure for acid sulfate soils Introduction and definitions, symbols and acronyms, sampling and sample preparation
ISO 14388-1:2014 Soil quality Acid-base accounting procedure for acid sulfate soils Part 1: Introduction and definitions, symbols and acronyms, sampling and sample preparation

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ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
ISO 10694:1995 Soil quality Determination of organic and total carbon after dry combustion (elementary analysis)
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