BS ISO 14388-2:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents for analysis of chromium reducible sulfur
6 Apparatus
7 Procedure for determining chromium reducible sulfur
8 Calculation of S[CR]
9 Reagents for determination of pH[KCl] and TAA
10 Procedure for determination of pH[KCl] and TAA
11 Calculation of TAA
12 Procedure for determination of sulfur (S[KCl]), calcium
   (Ca[KCl]), and magnesium (Mg[KCl]) extractable
   with 1 mol/l potassium chloride
13 Calculation of S[KCl], Ca[KCl], and Mg[KCl]
14 Reagents for determination of sulfur (S[HCl]), calcium
   (Ca[HCl]), and magnesium (Mg[HCl]) extractable
   with hydrochloric acid
15 Procedure for determination of sulfur (S[HCl]), calcium
   (Ca[HCl]), and magnesium (Mg[HCl]) extractable
   with hydrochloric acid
16 Calculation of net acid-soluble sulfur (S[NAS]), calcium
   (Ca[NAS]), and magnesium (Mg[NAS])
17 Reagents for determining acid neutralizing capacity by
   back-titration (ANC[BT])
18 Procedure for determining acid neutralizing capacity by
   back-titration (ANC[BT])
19 Alternatives for determination of acid neutralizing
   capacity
20 Precision
21 Test report
Bibliography

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

This part of ISO14388 specifies a suite of methods used to determine the net acidity in acid sulfate soils. This part of ISO14388 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 1mol/l KCl soil suspension (pHKCl) is determined. When pHKCl is