BS ISO 14388-3:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Procedure for determination of pH[KCl] and TAA
8 Calculation of TAA
9 Procedure for determination of sulfur (S[KCl]), calcium
   (Ca[KCl]) and magnesium (Mg[KCl]) extractable with
   1 mol/l potassium chloride
10 Calculation of S[KCl], Ca[KCl] and Mg[KCl]
11 Procedure for determination of peroxide pH (pH[OX]),
   titratable peroxide acidity (TPA) and excess acid
   neutralizing capacity (ANC[E])
12 Calculation of TPA and ANC[E]
13 Procedure for determining peroxide sulfur (S[P]),
   calcium (Ca[P]) and magnesium (Mg[P])
14 Calculation of peroxide sulfur (S[P]), calcium (Ca[P])
   and magnesium (Mg[P])
15 Procedure for determining acid extractable sulfur in
   soil residue after peroxide oxidation (S[RAS])
16 Calculation of S[RAS]
17 Calculation of TSA
18 Calculation of S[POS], Ca[A] and Mg[A]
19 Precision
20 Test report
Bibliography

Defines a suite of methods used to determine net acidity in acid sulfate soils.

This part of ISO14388 specifies a suite of methods used to determine net acidity in acid sulfate soils. This part of ISO14388 specifies a method for the determination of pH in a 1mol/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