ISO 22190:2020
Soil quality — Use of extracts for the assessment of bioavailability of trace elements in soils
This document provides guidance on the use of chemical methods establishing the bioavailability of trace elements in soil and soil-like materials and to stimulate the use of bioavailability in assessments. The methods themselves are not subject of this document.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Background
4.1 General
4.1.1 Presence of trace elements in the soil matrix
4.1.2 Neutral extracts for measurement of actual availability (ISO 21268-1)
4.1.3 Acid extracts for measurement of potential availability (ISO 17586)
4.2 Tiered approach based on bioavailability
5 General procedure using an extract
6 Reporting
7 Calibration
7.1 Introduction
7.2 Applicability of soil extracts
7.3 Limits of soil extracts to estimate trace element bioavailability
Annex A (informative) Calibration towards biological targets
Annex B (informative) Examples of transfer functions
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Background
4.1 General
4.1.1 Presence of trace elements in the soil matrix
4.1.2 Neutral extracts for measurement of actual availability (ISO 21268-1)
4.1.3 Acid extracts for measurement of potential availability (ISO 17586)
4.2 Tiered approach based on bioavailability
5 General procedure using an extract
6 Reporting
7 Calibration
7.1 Introduction
7.2 Applicability of soil extracts
7.3 Limits of soil extracts to estimate trace element bioavailability
Annex A (informative) Calibration towards biological targets
Annex B (informative) Examples of transfer functions
Bibliography