Overview
ISO 16387:2023 - "Soil quality - Effects of contaminants on Enchytraeidae (Enchytraeus sp.) - Determination of effects on reproduction" is an international standard that specifies a laboratory chronic reproduction test for soil-dwelling enchytraeids. The method evaluates the habitat function of soils by measuring survival and reproductive effects (offspring per test vessel) after dermal and alimentary exposure to contaminated soils or substances added to soils. The definitive reproduction test period is six weeks (with an optional two‑week range‑finding test for acute/sublethal effects). This third edition (2023) updates vapor pressure criteria and adds extraction guidance for Enchytraeus crypticus.
Key Topics
- Test organism: Enchytraeus sp. (Enchytraeidae), used because of ecological relevance and short generation time.
- Endpoints: survival of parental worms and fecundity (number of juveniles); results expressed as NOEC, LOEC, and ECx (effect concentration causing x% effect).
- Test design: range‑finding (≈2 weeks) and definitive reproduction test (6 weeks); test mixtures prepared once and not renewed during the test.
- Exposure routes: dermal and alimentary uptake.
- Applicability: soils and soil materials of unknown quality - contaminated sites, amended soils, soils after remediation, agricultural soils, wastes.
- Limitations: not applicable to substances with air/soil partition coefficient > 1 or vapour pressure > 300 Pa at 25 °C; the method does not include procedures to monitor the persistence of the test substance.
- Supporting procedures and annexes: culture conditions, alternative Enchytraeus species, water‑holding capacity determination, extraction techniques (including colloidal silica for E. crypticus), and statistical assessment (NOEC determination).
Applications
ISO 16387 is used by environmental laboratories, ecotoxicologists, remediation consultants, contaminated‑site managers, regulators and researchers to:
- Assess the biological/habitat function of soils and ecological hazard from soil contaminants.
- Support risk assessment and decision making for remediation, land reuse, and waste management.
- Evaluate amended or remediated soils, agricultural soils, and waste materials for sublethal effects on soil fauna.
- Generate standardized data (NOEC/ECx) suitable for regulatory dossiers and comparative studies.
Keywords: ISO 16387, soil quality, Enchytraeidae, Enchytraeus, reproduction test, ecotoxicology, chronic test, NOEC, ECx, contaminated sites.
Related Standards
For implementation, users should follow the full ISO 16387:2023 document and coordinate with national accreditation and regulatory requirements.