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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Sika Hardener LTJ was classified as not readily biodegradable but fulfils the criteria for inherently biodegradation since theThODwas above 20% within 28 days.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

A study was conducted according to OECD TG 301-F and Directive 92/69/EWG method C.4-D. The test item Sika Hardener LTJ was tested using a concentration of about 80 mg test item/L (equivalent to a theoretical oxygen demand of about 250 mg O2/L). Activated sludge was used as inoculum. The test was left running for 28 days. All validity criteria were met. The reference item reached the pass level of 60% on day 4. The degree of biodegradation reached an average value of 51 % after 28 days. The 10d-window began on day 1, at its end, 41 % were reached, staying below the pass level of 60%. Thus, Sika Hardener LTJ was classified as not readily biodegradable. According to ECHA guidance IR/CSA chapter R7b, the substance fulfils the criteria for inherently biodegradation since the ThOD was above 20% within 28 days.