ISO 17512-1:2008

Overview

ISO 17512-1:2008 - "Soil quality - Avoidance test ... Part 1: Test with earthworms (Eisenia fetida and Eisenia andrei)" specifies a rapid screening method to evaluate the habitat function of soils and the influence of contaminants on earthworm behaviour. The standard uses the avoidance behaviour of adult compost worms (Eisenia fetida or Eisenia andrei) as the measurement endpoint to reflect the bioavailability of contaminant mixtures in natural or spiked soils. The test is a sublethal, short-duration alternative to longer reproduction assays and is designed for quick hazard screening rather than replacing reproduction tests.

Key topics and technical requirements

• Test principle: Ten adult earthworms are offered a choice between control soil and test soil in a divided vessel; after an incubation period (typically two days) the distribution of worms is counted to determine avoidance.
• Test designs: Two validated vessel designs - a two-section chamber and a six-section chamber - are described; both can be used for single-concentration (field soil quality) or multi-concentration (chemical toxicity) tests.
• Organisms and conditioning: Use adult Eisenia fetida or Eisenia andrei (approx. 300–600 mg); condition worms in control soil for at least one day.
• Substrate preparation: Soils sieved (≈2 mm), adjusted to about 60% maximum water-holding capacity; determine pH (ISO 10390) and water content (ISO 11465) prior to testing.
• Reference toxicant: Boric acid (H3BO3) is recommended as a reference chemical for quality control.
• Endpoints and metrics: Avoidance percentage and derived effect concentrations (ECx) (e.g., EC50) are used; a threshold of >80% avoidance indicates a limited habitat function.
• Supporting material: The standard includes procedures, validity criteria, calculations, reporting requirements and informative annexes (chamber designs, breeding methods, water-holding capacity, comparability).

Practical applications and users

• Applications
  • Rapid screening of contaminated sites and remediated soils
  • Pre-screening of chemicals for soil behavioural effects
  • Complementary bioavailability assessment alongside chemical analysis
  • Routine ecotoxicological monitoring and remediation verification
• Who uses it
  • Environmental and soil ecotoxicology laboratories
  • Contaminated land consultants and remediation contractors
  • Regulatory agencies and environmental risk assessors
  • Research institutions studying soil–organism interactions

Related standards

• ISO 11268-2 (earthworm reproduction test) - referenced as a longer-term endpoint
• ISO 15799 (ecotoxicological soil characterisation guidance)
• ISO 10390 (soil pH), ISO 11465 (soil water content), ISO 11269-2 (plant effects)

ISO 17512-1:2008 is a practical, standardized method for assessing soil habitat quality via earthworm avoidance behaviour and is especially valuable when rapid, biologically meaningful screening of bioavailable soil contaminants is required.