ISO 5430:2023

Overview

ISO 5430:2023 specifies an ecotoxicity testing scheme for soluble decomposition intermediates produced during the biodegradation of biodegradable plastics and products used in the marine environment. It defines test methods, acceptance criteria and reporting requirements to assess potential adverse effects of soluble degradation products on marine organisms across multiple trophic levels. This standard addresses degradation products released into seawater or sediment/water matrices and is not suitable for assessing adverse effects from solid plastic fragments.

Key topics and technical requirements

• Target hazard: soluble degradation products (intermediates or residues) from biodegradable plastics used in marine applications (e.g., aquaculture nets, ropes, floats, buoys).
• Trophic-level coverage: tests cover four ecological roles:
  • Primary producers - marine algae (Skeletonema sp., Phaeodactylum tricornutum; ISO 10253 with Annex A modifications)
  • Primary consumers - marine invertebrates (marine copepods; ISO 14669 with Annex B modifications)
  • Secondary consumers (optional) - marine fish (OECD 203 with Annex C modifications)
  • Decomposers - marine microorganisms (Aliivibrio fischeri luminescence test; ISO 11348 with Annex D modifications)
• Matrix preparation: marine test matrices must be generated by biodegradation tests under mesophilic laboratory conditions following ISO 18830, ISO 19679, ISO 22404, ISO 23977‑1/2 and related methods.
• Minimum test-item loading: examples include at least 75 mg/100 g sediment (ISO 22404) or 100 mg/L seawater (ISO 23977‑1/2); similar minimums apply for seawater+sedi­ment protocols.
• Timing options for ecotoxicity sampling:
  • Option 1 (limit test): test when absolute mineralization reaches 50%.
  • Option 2 (time-dependent): test at 20%, 40%, and at a plateau (≥60%) mineralization.
• Comparative approach: ecotoxicity is determined by comparing matrices exposed to the test material, a reference material (e.g., microcrystalline cellulose), and unexposed control matrices.

Practical applications and users

• Who uses it:
  • Manufacturers and formulators of biodegradable plastics for marine use
  • Environmental testing laboratories and contract research organizations
  • Regulators and certification bodies conducting environmental risk assessment
  • Product designers for aquaculture, marine infrastructure and non-fishing marine products
• Why it’s useful:
  • Integrates biodegradation data with ecotoxicity outcomes for informed risk assessment
  • Supports product development by identifying harmful soluble degradation products early
  • Helps demonstrate environmental performance for regulatory compliance and market claims

Related standards

• ISO 10253, ISO 11348, ISO 14669, ISO 18830, ISO 19679, ISO 22404, ISO 23977‑1/2, ISO 22403, ISO 17088 and other ISO biodegradation/disintegration standards referenced for matrix generation and method alignment.

Keywords: ISO 5430:2023, ecotoxicity testing, marine environment, biodegradable plastics, soluble decomposition intermediates, algae toxicity, copepod toxicity, luminescent bacteria test, marine biodegradation, environmental risk assessment.