ISO 14388-3:2014 PDF
Soil quality — Acid-base accounting procedure for acid sulfate soils — Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology
Soil quality — Acid-base accounting procedure for acid sulfate soils — Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 20
- Дата публикации:
- 24 июля 2014 г.
- Издание:
- ISO IS 14388 edition 1 version 1
- ICS:
- 13.080.10
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 RAS) 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.
Abstract
Overview
ISO 14388-3:2014 - titled "Soil quality - Acid-base accounting procedure for acid sulfate soils - Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology" - specifies a laboratory suite of methods (the SPOCAS suite) to determine net acidity and sulfur-related parameters in acid sulfate soils. Issued by ISO, this standard forms Part 3 of the ISO 14388 series and complements Part 1 (introductory material) and Part 2 (chromium reducible sulfur, CRS, methodology).
Key topics and technical requirements
- Measurement of soil pH in a 1 mol/l potassium chloride (pHKCl) suspension and, where required, titratable actual acidity (TAA) by titration to pH 6.5.
- Determination of KCl-extractable sulfur (SKCl), calcium (CaKCl) and magnesium (MgKCl) from the pHKCl suspension (after appropriate dilution and analysis).
- A separate test portion is digested with 30% hydrogen peroxide to oxidize sulfides and organic matter:
- Measure peroxide pH (pHOX), titratable peroxide acidity (TPA) and excess acid neutralizing capacity (ANC).
- Determine peroxide-extractable sulfur (SP), calcium (CaP) and magnesium (MgP) post-digestion.
- On samples with jarosite or where pHKCl
Технические детали
- Технический комитет
- ISO/TC 190/SC 3 - Chemical and physical characterization
- SKU
- ISO 14388-3:2014
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