M00000211
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ISO 14388-2 1st Edition, August 1, 2014 Soil quality - Acid-base accounting procedure for acid sulfate soils - Part 2: Chromium reducible sulfur (CRS) methodology
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 14388 specifies a suite of methods used to
determine the net acidity in acid sulfate soils. This part of ISO
14388 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).