ISO 14388-2:2014
Soil quality — Acid-base accounting procedure for acid sulfate soils — Part 2: Chromium reducible sulfur (CRS) methodology
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).
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Table tab_a
Figure fig_1
Section sec_1
Section sec_2
Section sec_3
Section sec_4
Section sec_4.1
Section sec_4.2
Section sec_4.3
Section sec_5
Section sec_5.1
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_5.5
Section sec_5.6
Section sec_5.7
Section sec_5.8
Section sec_5.9
Section sec_5.10
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.5
Section sec_6.6
Section sec_6.7
Section sec_6.8
Section sec_6.9
Section sec_6.10
Section sec_6.11
Section sec_6.12
Section sec_6.13
Section sec_6.14
Section sec_6.15
Section sec_6.16
Section sec_6.17
Section sec_6.18
Section sec_6.19
Section sec_6.20
Section sec_6.21
Section sec_6.22
Section sec_6.23
Section sec_6.24
Section sec_6.25
Section sec_6.26
Section sec_7
Table tab_c
Figure fig_2
Section sec_8
Section sec_9
Section sec_9.1
Section sec_9.1.1
Section sec_9.1.2
Section sec_9.1.3
Section sec_9.1.4
Section sec_9.2
Section sec_9.3
Section sec_9.3.1
Section sec_9.3.2
Section sec_10
Section sec_10.1
Section sec_10.2
Section sec_10.2.1
Section sec_10.2.2
Section sec_10.3
Section sec_10.3.1
Section sec_10.3.2
Section sec_11
Section sec_12
Section sec_13
Section sec_14
Section sec_14.1
Section sec_14.2
Section sec_15
Section sec_16
Section sec_17
Section sec_17.1
Section sec_17.2
Section sec_17.3
Section sec_17.4
Section sec_17.5
Section sec_18
Section sec_18.1
Section sec_18.2
Section sec_19
Section sec_20
Table tab_1
Section sec_21
Reference ref_1
Reference ref_2
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Potential sulfidic acidity
4.2 Actual acidity and retained acidity
4.3 Acid neutralizing capacity
5 Reagents for analysis of chromium reducible sulfur
6 Apparatus
7 Procedure for determining chromium reducible sulfur
8 Calculation of SCR
9 Reagents for determination of pHKCl and TAA
10 Procedure for determination of pHKCl and TAA
10.1 Preparation of the suspension
10.2 Measurement of pHKCl
10.3 Measurement of TAA
11 Calculation of TAA
12 Procedure for determination of sulfur (SKCl), calcium (CaKCl), and magnesium (MgKCl) extractable with 1 mol/l potassium chloride
13 Calculation of SKCl, CaKCl, and MgKCl
14 Reagents for determination of sulfur (SHCl), calcium (CaHCl), and magnesium (MgHCl) extractable with hydrochloric acid
15 Procedure for determination of sulfur (SHCl), calcium (CaHCl), and magnesium (MgHCl) extractable with hydrochloric acid
16 Calculation of net acid-soluble sulfur (SNAS), calcium (CaNAS), and magnesium (MgNAS)
17 Reagents for determining acid neutralizing capacity by back-titration (ANCBT)
18 Procedure for determining acid neutralizing capacity by back-titration (ANCBT)
18.1 Hotplate digestion with hydrochloric acid solution
18.2 Titration of unreacted acid in digested soil suspension
19 Alternatives for determination of acid neutralizing capacity
20 Precision
21 Test report
Bibliography
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Table tab_a
Figure fig_1
Section sec_1
Section sec_2
Section sec_3
Section sec_4
Section sec_4.1
Section sec_4.2
Section sec_4.3
Section sec_5
Section sec_5.1
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_5.5
Section sec_5.6
Section sec_5.7
Section sec_5.8
Section sec_5.9
Section sec_5.10
Section sec_6
Section sec_6.1
Section sec_6.2
Section sec_6.3
Section sec_6.4
Section sec_6.5
Section sec_6.6
Section sec_6.7
Section sec_6.8
Section sec_6.9
Section sec_6.10
Section sec_6.11
Section sec_6.12
Section sec_6.13
Section sec_6.14
Section sec_6.15
Section sec_6.16
Section sec_6.17
Section sec_6.18
Section sec_6.19
Section sec_6.20
Section sec_6.21
Section sec_6.22
Section sec_6.23
Section sec_6.24
Section sec_6.25
Section sec_6.26
Section sec_7
Table tab_c
Figure fig_2
Section sec_8
Section sec_9
Section sec_9.1
Section sec_9.1.1
Section sec_9.1.2
Section sec_9.1.3
Section sec_9.1.4
Section sec_9.2
Section sec_9.3
Section sec_9.3.1
Section sec_9.3.2
Section sec_10
Section sec_10.1
Section sec_10.2
Section sec_10.2.1
Section sec_10.2.2
Section sec_10.3
Section sec_10.3.1
Section sec_10.3.2
Section sec_11
Section sec_12
Section sec_13
Section sec_14
Section sec_14.1
Section sec_14.2
Section sec_15
Section sec_16
Section sec_17
Section sec_17.1
Section sec_17.2
Section sec_17.3
Section sec_17.4
Section sec_17.5
Section sec_18
Section sec_18.1
Section sec_18.2
Section sec_19
Section sec_20
Table tab_1
Section sec_21
Reference ref_1
Reference ref_2
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Potential sulfidic acidity
4.2 Actual acidity and retained acidity
4.3 Acid neutralizing capacity
5 Reagents for analysis of chromium reducible sulfur
6 Apparatus
7 Procedure for determining chromium reducible sulfur
8 Calculation of SCR
9 Reagents for determination of pHKCl and TAA
10 Procedure for determination of pHKCl and TAA
10.1 Preparation of the suspension
10.2 Measurement of pHKCl
10.3 Measurement of TAA
11 Calculation of TAA
12 Procedure for determination of sulfur (SKCl), calcium (CaKCl), and magnesium (MgKCl) extractable with 1 mol/l potassium chloride
13 Calculation of SKCl, CaKCl, and MgKCl
14 Reagents for determination of sulfur (SHCl), calcium (CaHCl), and magnesium (MgHCl) extractable with hydrochloric acid
15 Procedure for determination of sulfur (SHCl), calcium (CaHCl), and magnesium (MgHCl) extractable with hydrochloric acid
16 Calculation of net acid-soluble sulfur (SNAS), calcium (CaNAS), and magnesium (MgNAS)
17 Reagents for determining acid neutralizing capacity by back-titration (ANCBT)
18 Procedure for determining acid neutralizing capacity by back-titration (ANCBT)
18.1 Hotplate digestion with hydrochloric acid solution
18.2 Titration of unreacted acid in digested soil suspension
19 Alternatives for determination of acid neutralizing capacity
20 Precision
21 Test report
Bibliography