NF ISO 14388-2

NF ISO 14388-2

November 2014
Standard Current

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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National standards and national normative documents

Publication date

November 2014

Number of pages

24 p.

Reference

NF ISO 14388-2

ICS Codes

13.080.10   Chemical characteristics of soils

Classification index

X31-112-2

Print number

1

International kinship

ISO 14388-2:2014
Sumary
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).

Table of contents
  • Avant-propos
    iv
  • Introduction
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    2
  • 4 Principe
    2
  • 4.1 Acidité sulfurique potentielle
    2
  • 4.2 Acidité réelle et acidité retenue
    2
  • 4.3 Capacité de neutralisation d'acide
    2
  • 5 Réactifs pour l'analyse du soufre réductible dans le chrome
    2
  • 6 Appareillage
    4
  • 7 Mode opératoire pour la détermination du soufre réductible dans le chrome
    5
  • 8 Calcul de SRC
    8
  • 9 Réactifs pour la détermination du pHKCI et de l'ART
    8
  • 10 Mode opératoire pour la détermination du pHKCI et de l'ART
    10
  • 10.1 Préparation de la suspension
    10
  • 10.2 Mesurage du pHKCI
    10
  • 10.3 Mesurage de l'ART
    11
  • 11 Calcul de l'ART
    12
  • 12 Mode opératoire pour la détermination du soufre (SKCI, du calcium (CaKCI) et du magnésium (MgKCI) extractibles avec le chlorure de potassium à 1 mol/l
    12
  • 13 Calcul de SKCI, CaKCl et MgKCl
    13
  • 14 Réactifs pour la détermination du soufre (SHCI), du calcium (CaHCI) et du magnésium (MgHCI) extractibles avec l'acide chlorhydrique
    13
  • 15 Mode opératoire pour la détermination du soufre (SHCI), du calcium (CaHCl) et du magnésium (MgHCl) extractibles avec l'acide chlorhydrique
    13
  • 16 Calcul du soufre (SSAN), du calcium (CaSAN) et du magnésium (MgSAN) solubles dans l'acide nets
    14
  • 17 Réactifs pour la détermination de la capacité de neutralisation d'acide par titrage en retour (CNART)
    14
  • 18 Mode opératoire pour la détermination de la capacité de neutralisation d'acide par titrage en retour (CNART)
    15
  • 18.1 Digestion sur plaque chauffante avec solution d'acide chlorhydrique
    15
  • 18.2 Titrage de l'acide n'ayant pas réagi dans la suspension de sol digérée
    16
  • 19 Alternatives à la détermination de la capacité de neutralisation d'acide
    17
  • 20 Fidélité
    17
  • 21 Rapport d'essai
    18
  • Bibliographie
    20
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