ISO 23470:2018

Name: ISO 23470:2018 — Soil quality — Determination of effective cation exchange capacity (CEC) and exchangeable cations using a hexamminecobalt(III)chloride solution
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Soil quality — Determination of effective cation exchange capacity (CEC) and exchangeable cations using a hexamminecobalt(III)chloride solution

Название (английский):

ISO 23470:2018

Soil quality — Determination of effective cation exchange capacity (CEC) and exchangeable cations using a hexamminecobalt(III)chloride solution

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 22
Дата публикации:: 5 сентября 2018 г.
Издание:: ISO IS 23470 edition 2 version 1
ICS:: 13.080.20

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Описание (английский):

This document specifies a method for the determination of cation exchange capacity (CEC) and the content of exchangeable cations (Al, Ca, Fe, K, Mg Mn, Na) in soils using a hexamminecobalt(III)chloride solution as extractant. For soils containing calcium carbonate a calcite saturated hexamminecobalt(III)chloride solution is specified particularly for determination of exchangeable Ca. This document is applicable to all types of air-dry soil samples which have been prepared according to ISO 11464.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 23470:2018 - Soil quality - Determination of effective cation exchange capacity (CEC) and exchangeable cations using a hexamminecobalt(III)chloride solution - specifies a laboratory method to measure effective CEC and the content of exchangeable cations (Al, Ca, Fe, K, Mg, Mn, Na) in soils. The method uses a hexamminecobalt(III)chloride extractant and is applicable to air‑dry soil samples prepared according to ISO 11464. For calcareous soils a calcite‑saturated hexamminecobalt(III)chloride solution is specified to reduce carbonate dissolution and avoid inflated Ca results.

Key topics and technical requirements

Principle: Adsorbed soil cations are displaced by hexamminecobalt(III) ions; CEC is calculated from the difference between initial and remaining hexamminecobalt in extract.

Extraction conditions: Exchange reaction typically performed with shaking for (60 ± 5) min at (20 ± 2) °C (as specified in the standard).

Analytical determinations:

Hexamminecobalt can be quantified by total ammonium nitrogen (distillation), direct spectrophotometry, or total cobalt measurement.
Exchanged cations are determined from the same extract using spectrometric methods (e.g., ICP‑AES).

Reagents: use analytical‑grade chemicals and deionized water; the standard gives preparation details for hexamminecobalt(III)chloride solution (β ≈ 0.0166 mol/L) and the calcite‑saturated variant for calcareous soils.

Scope limits & notes:

Method yields the effective CEC at the soil’s natural pH (recommended for soils with pH ≤ 6.5).
Calcite‑saturated extract is recommended for soils with pH ≥ 6.5 to minimize carbonate dissolution and erroneous exchangeable Ca.
Known limitations include potential underestimation in microporous materials (where hexamminecobalt ions cannot reach some exchange sites) and increased Ca from gypsum dissolution.

Practical applications and users

Who uses it: soil testing laboratories, agronomists, environmental consultancies, soil scientists, land‑use planners and regulatory agencies.

Uses:

Assessing soil fertility and nutrient-holding capacity (CEC and base cation status).
Monitoring soil amendments, liming effects, and remediation projects.
Research and interlaboratory comparison studies for soil chemical characterization.

Benefits: one‑step extraction with high affinity extractant, comparable to established CEC methods, and specific procedures to avoid carbonate-related errors in calcareous soils.

Related standards

ISO 11464 - Pretreatment of samples for physico‑chemical analysis

ISO 11465 - Determination of dry matter and water content

ISO 13536, ISO 13563, ISO 11260 - referenced methods and complementary CEC/soil pH procedures

Keywords: ISO 23470:2018, soil quality, cation exchange capacity, CEC, hexamminecobalt(III)chloride, exchangeable cations, calcite saturated, soil testing, ICP‑AES.

ISO 23470:2018

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

BS ISO 11464:2006

Soil quality. Pretreatment of samples for physio-chemical analysis.

BS EN ISO 11465:2025

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BS ISO 13536:2024

Soil quality. Determination of the potential cation exchange capacity and exchangeable cations using barium c…

ISO 13563-1:2001

Single side loading fork-lift trucks — Part 1: Stability tests

BS EN ISO 11260:2018

Soil quality. Determination of effective cation exchange capacity and base saturation level using barium chlo…