Testing the biodegradability of difficult compounds: a future challenge for the OECD/ISO standardization.
Strotmann U, Heipieper HJ, Eberlein C, Mayer P, Birch H
Soil Health
Same flawed tests that fail to accurately measure chemical breakdown are used to approve pesticides, fertilizers, and plastic mulches that end up in your garden soil and the parks where you walk.
For over 50 years, companies and governments have used a standard set of lab tests to check if chemicals will safely break down in nature — but these tests have serious blind spots. They don't work well for plastics, oily substances, or complicated chemical mixtures, meaning we may be underestimating how long some garden chemicals and packaging materials linger in the environment. Researchers are now pushing for next-generation tests that give us a much clearer, more honest picture of what happens to these substances once they enter the soil and water around us.
Key Findings
Standardized biodegradation tests have been in use for over 50 years but contain significant gaps, particularly for plastics, hydrophobic (oily) compounds, and complex chemical mixtures (UVCBs).
The microbial 'starter cultures' (inocula) used in these tests are poorly characterized, undermining the reproducibility and reliability of results across labs and countries.
The review calls for a full re-examination of the OECD/ISO biodegradation test framework and development of improved methods capable of predicting real-world environmental breakdown.
chevron_right Technical Summary
Scientists are calling for a major overhaul of the decades-old international system used to test whether chemicals break down safely in the environment. Current standardized tests struggle with plastics, oily compounds, and complex mixtures — leaving regulators without reliable data on how these substances behave in soil and water.
Abstract Preview
For a period exceeding five decades, industrial and scientific communities, in conjunction with regulators, have utilized a complexified, standardized system (e.g., OECD, Organisation for Economic ...
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