Zahn-Wellens/EMPA Test (OECD 302B)

Freshwater Modified Zahn-Wellens/EMPA Test

This freshwater method is not suitable for volatile materials.

The test material is added to a large volume of activated sludge and nutrient mixture, and the decline in dissolved oxygen concentration measured frequently. The duration of the study is generally 28 days but may be extended if a significant lag period is noted at the start. A result of > 70% degradation means that the substance is ‘ultimately’ biodegradable but < 70% and > 20%, it is ‘inherently’ biodegradable.

Summary

Assess the biodegradability of your product in the freshwater environment. This method is not suitable for volatile materials.

Contact Information

For all enquiries, call our sales team on

+44 (0)1954 252519