EN ISO 16198:2015 PDF

Overview

EN ISO 16198:2015 (ISO 16198:2015) - titled Soil quality - Plant-based test to assess the environmental bioavailability of trace elements to plants - specifies a standardized plant-based biotest for estimating the environmental bioavailability of trace elements to plants. The standard describes a laboratory procedure in which roots are grown in contact with soil (without penetrating it) so that uptake into shoots and roots - or more integratively, the net uptake flux - can be quantified. Prepared by ISO/TC 190 and adopted by CEN as EN ISO 16198:2015, it supports consistent, comparable assessments of trace element bioavailability across soils.

Key topics and requirements

The standard covers technical and procedural elements needed to run the biotest, including:

• Principle of the plant-based biotest and rationale for root–soil contact design.
• Selection of plant species and seed handling (annexes list adapted species and seed densities).
• Biotest apparatus and technical drawings for test components.
• Composition of nutrient solutions, growth-chamber climatic conditions, and pre-culture hydroponic steps.
• Soil sample pre-treatment (size reduction, sample size) and required soil analyses.
• Experimental procedure: germination, incubation with soil or soil material, plant growth period, harvests, grinding, digestion and analytical determination of trace elements.
• Validity criteria and statistical analysis requirements for biomasses and bioavailability end points.
• Reporting requirements and annexed guidance on digestion, expected biomass ranges and ring-test procedures.

Applications and users

EN ISO 16198:2015 is useful for:

• Environmental laboratories performing soil quality and contamination assessments.
• Soil scientists and ecotoxicologists quantifying bioavailability of metals and trace elements to plants.
• Regulatory bodies and consultants assessing contaminated land, risk to vegetation, and remediation effectiveness.
• Agronomists and remediation specialists comparing bioavailability across different soils or monitoring post-remediation changes.

The method provides a biologically relevant complement to chemical extraction methods by accounting for rhizosphere processes and plant uptake behavior.

Related standards

• ISO 17402 (conceptual framework for bioavailability)
• Chemical methods such as ISO 19730 (for comparison and correlation)
• Other plant-based biotests: ISO 11269‑1, ISO 11269‑2, ISO 17126, ISO 22030

Keywords: EN ISO 16198:2015, ISO 16198:2015, soil quality, plant-based biotest, bioavailability, trace elements, environmental bioavailability, soil assessment.