ISO 14388-3:2014
Soil quality — Acid-base accounting procedure for acid sulfate soils — Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology
ISO 14388-3:2014 specifies a suite of methods used to determine net acidity in acid sulfate soils. ISO 14388-3:2014 specifies a method for the determination of pH in a 1 mol/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 < 4,5, residual acid soluble sulfur (SRAS) is determined on the soil residue remaining after peroxide digestion. Titratable sulfidic acidity (TSA), reacted calcium (CaA), reacted magnesium (MgA) and peroxide oxidizable sulfur (SPOS) are then determined by difference. For peat samples containing substantial levels of organic sulfur, the SPOCAS suite is generally unsuitable for estimating sulfide content, and the chromium reducible suite of procedures should be used instead.
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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_5
Section sec_5.1
Section sec_5.1.1
Section sec_5.1.2
Section sec_5.1.3
Section sec_5.1.4
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_5.5
Section sec_5.6
Section sec_5.6.1
Section sec_5.6.2
Section sec_5.7
Section sec_5.8
Section sec_5.9
Section sec_5.10
Section sec_5.10.1
Section sec_5.10.2
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_7
Section sec_7.1
Section sec_7.2
Section sec_7.2.1
Section sec_7.2.2
Section sec_7.3
Section sec_7.3.1
Section sec_7.3.2
Section sec_8
Section sec_9
Section sec_10
Section sec_11
Section sec_11.1
Section sec_11.1.1
Section sec_11.1.2
Section sec_11.1.3
Section sec_11.1.4
Section sec_11.1.5
Section sec_11.1.6
Section sec_11.1.7
Section sec_11.2
Section sec_11.2.1
Section sec_11.2.2
Section sec_11.2.2.1
Section sec_11.2.2.2
Section sec_11.2.2.3
Section sec_11.2.3
Section sec_11.2.3.1
Section sec_11.2.3.2
Section sec_11.2.3.3
Section sec_11.3
Section sec_11.3.1
Section sec_11.3.2
Section sec_11.3.3
Section sec_11.3.4
Section sec_11.4
Section sec_11.4.1
Section sec_11.4.2
Section sec_11.4.3
Section sec_11.4.4
Section sec_11.4.5
Section sec_11.5
Section sec_11.5.1
Section sec_11.5.1.1
Section sec_11.5.1.2
Section sec_11.5.2
Section sec_11.5.2.1
Section sec_11.5.2.2
Section sec_11.5.2.3
Section sec_11.5.2.4
Section sec_11.5.2.5
Section sec_12
Section sec_12.1
Section sec_12.2
Section sec_12.3
Section sec_12.3.1
Section sec_12.3.2
Section sec_13
Section sec_13.1
Section sec_13.2
Section sec_13.3
Section sec_13.4
Section sec_13.5
Section sec_14
Section sec_15
Section sec_15.1
Section sec_15.2
Section sec_15.2.1
Section sec_15.2.2
Section sec_15.2.3
Section sec_15.2.4
Section sec_15.2.5
Section sec_15.2.6
Section sec_15.2.7
Section sec_15.2.8
Section sec_16
Section sec_16.1
Section sec_17
Section sec_18
Section sec_19
Table tab_1
Section sec_20
Reference ref_1
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Actual acidity and retained acidity
4.2 Titratable peroxide acidity, excess acid neutralizing capacity and potential sulfidic acidity
5 Reagents
6 Apparatus
7 Procedure for determination of pHKCl and TAA
7.1 Preparation of the suspension
7.2 Measurement of pHKCl
7.3 Measurement of TAA
8 Calculation of TAA
9 Procedure for determination of sulfur (SKCl), calcium (CaKCl) and magnesium (MgKCl) extractable with 1 mol/l potassium chloride
10 Calculation of SKCl, CaKCl and MgKCl
11 Procedure for determination of peroxide pH (pHOX), titratable peroxide acidity (TPA) and excess acid neutralizing capacity (ANCE)
11.1 Peroxide digestion of sample
11.2 Measurement of pHOX
11.3 Carbonate modification (HCl titration to pH 4)
11.4 Decomposition of excess peroxide
11.5 Measurement of titratable peroxide acidity (TPA)
12 Calculation of TPA and ANCE
12.1 Notation
12.2 TPA without carbonate modification
12.3 ANCE (or TPA) with carbonate modification
13 Procedure for determining peroxide sulfur (SP), calcium (CaP) and magnesium (MgP)
14 Calculation of peroxide sulfur (SP), calcium (CaP) and magnesium (MgP)
15 Procedure for determining acid extractable sulfur in soil residue after peroxide oxidation (SRAS)
15.1 General
15.2 Rinsing of peroxide digested soil residue, extraction with 4 mol/l hydrochloric acid and determination of extractable sulfur
16 Calculation of SRAS
16.1 Calculation of acidity attributed to SRAS (acid-base accounting)
17 Calculation of TSA
18 Calculation of SPOS, CaA and MgA
19 Precision
20 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_5
Section sec_5.1
Section sec_5.1.1
Section sec_5.1.2
Section sec_5.1.3
Section sec_5.1.4
Section sec_5.2
Section sec_5.3
Section sec_5.4
Section sec_5.5
Section sec_5.6
Section sec_5.6.1
Section sec_5.6.2
Section sec_5.7
Section sec_5.8
Section sec_5.9
Section sec_5.10
Section sec_5.10.1
Section sec_5.10.2
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_7
Section sec_7.1
Section sec_7.2
Section sec_7.2.1
Section sec_7.2.2
Section sec_7.3
Section sec_7.3.1
Section sec_7.3.2
Section sec_8
Section sec_9
Section sec_10
Section sec_11
Section sec_11.1
Section sec_11.1.1
Section sec_11.1.2
Section sec_11.1.3
Section sec_11.1.4
Section sec_11.1.5
Section sec_11.1.6
Section sec_11.1.7
Section sec_11.2
Section sec_11.2.1
Section sec_11.2.2
Section sec_11.2.2.1
Section sec_11.2.2.2
Section sec_11.2.2.3
Section sec_11.2.3
Section sec_11.2.3.1
Section sec_11.2.3.2
Section sec_11.2.3.3
Section sec_11.3
Section sec_11.3.1
Section sec_11.3.2
Section sec_11.3.3
Section sec_11.3.4
Section sec_11.4
Section sec_11.4.1
Section sec_11.4.2
Section sec_11.4.3
Section sec_11.4.4
Section sec_11.4.5
Section sec_11.5
Section sec_11.5.1
Section sec_11.5.1.1
Section sec_11.5.1.2
Section sec_11.5.2
Section sec_11.5.2.1
Section sec_11.5.2.2
Section sec_11.5.2.3
Section sec_11.5.2.4
Section sec_11.5.2.5
Section sec_12
Section sec_12.1
Section sec_12.2
Section sec_12.3
Section sec_12.3.1
Section sec_12.3.2
Section sec_13
Section sec_13.1
Section sec_13.2
Section sec_13.3
Section sec_13.4
Section sec_13.5
Section sec_14
Section sec_15
Section sec_15.1
Section sec_15.2
Section sec_15.2.1
Section sec_15.2.2
Section sec_15.2.3
Section sec_15.2.4
Section sec_15.2.5
Section sec_15.2.6
Section sec_15.2.7
Section sec_15.2.8
Section sec_16
Section sec_16.1
Section sec_17
Section sec_18
Section sec_19
Table tab_1
Section sec_20
Reference ref_1
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Actual acidity and retained acidity
4.2 Titratable peroxide acidity, excess acid neutralizing capacity and potential sulfidic acidity
5 Reagents
6 Apparatus
7 Procedure for determination of pHKCl and TAA
7.1 Preparation of the suspension
7.2 Measurement of pHKCl
7.3 Measurement of TAA
8 Calculation of TAA
9 Procedure for determination of sulfur (SKCl), calcium (CaKCl) and magnesium (MgKCl) extractable with 1 mol/l potassium chloride
10 Calculation of SKCl, CaKCl and MgKCl
11 Procedure for determination of peroxide pH (pHOX), titratable peroxide acidity (TPA) and excess acid neutralizing capacity (ANCE)
11.1 Peroxide digestion of sample
11.2 Measurement of pHOX
11.3 Carbonate modification (HCl titration to pH 4)
11.4 Decomposition of excess peroxide
11.5 Measurement of titratable peroxide acidity (TPA)
12 Calculation of TPA and ANCE
12.1 Notation
12.2 TPA without carbonate modification
12.3 ANCE (or TPA) with carbonate modification
13 Procedure for determining peroxide sulfur (SP), calcium (CaP) and magnesium (MgP)
14 Calculation of peroxide sulfur (SP), calcium (CaP) and magnesium (MgP)
15 Procedure for determining acid extractable sulfur in soil residue after peroxide oxidation (SRAS)
15.1 General
15.2 Rinsing of peroxide digested soil residue, extraction with 4 mol/l hydrochloric acid and determination of extractable sulfur
16 Calculation of SRAS
16.1 Calculation of acidity attributed to SRAS (acid-base accounting)
17 Calculation of TSA
18 Calculation of SPOS, CaA and MgA
19 Precision
20 Test report
Bibliography