ISO 14388-3:2014 土壤质量 酸性硫酸盐土壤酸碱会计程序 第3部分：悬挂过氧化物氧化结合酸度和硫磺处理（SPOCAS）方法

标准编号：ISO 14388-3:2014

中文名称：土壤质量 酸性硫酸盐土壤酸碱会计程序 第3部分：悬挂过氧化物氧化结合酸度和硫磺处理（SPOCAS）方法

英文名称：Soil quality — Acid-base accounting procedure for acid sulfate soils — Part 3: Suspension peroxide oxidation combined acidity and sulfur (SPOCAS) methodology

发布日期：2014-08

标准范围

This part of ISO 14388 specifies a suite of methods used to determine net acidity in acid sulfate soils.This part of ISO 14388 specifies a method for the determination of pH in a 1 mol/l potassium chloridesoil suspension (pHKCl) and where required, titratable actual acidity (TAA). Following this, potassiumchloride extractable sulfur (SKCl), calcium (CaKCl) and magnesium (MgKCl) are determined. On a separatetest portion, following digestion with 30 % hydrogen peroxide, peroxide pH (pHOX), titratable peroxideacidity (TPA) and excess acid neutralizing capacity (ANCE) are determined. Following this, peroxidesulfur (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 remainingafter peroxide digestion. Titratable sulfidic acidity (TSA), reacted calcium (CaA), reacted magnesium(MgA) and peroxide oxidizable sulfur (SPOS) are then determined by difference. For peat samplescontaining substantial levels of organic sulfur, the SPOCAS suite is generally unsuitable for estimatingsulfide content, and the chromium reducible suite of procedures should be used instead.

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