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Environmental fate & pathways

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Additional information

Biodegradation

Biodegradation in water: screening test

The ready biodegradability was tested in study (Ciba-Geigy Ltd., 1989) according to OECD 301B (1992) with the close structural analogue substance CAS 1324-29-4. After the 28 day incubation period a degradation rate of 1 - 3 % was observed. The test substance is considered to be not ready biodegradable under the test conditions.

 

Biodegradation in water and sediment: simulation test

According to Annex IX, Section 9.2.1.2 column 2 of REACH Regulation (EC) No 1907/2006 a study on simulation testing on ultimate degradation in surface water does need not to be conducted, if the substance is highly insoluble in water. Additionally, the substance was determined to be poorly biodegradable in water according to OECD 301B. Comparable degradation rates are expected for biodegradation in water and sediment. In addition, a biodegradation in water and sediment simulation test does need not to be conducted, if the substance can be expected to have a low potential for adsorption to the sediment. A log kow of 1.78 was determined which indicates low potential for adsorption to sediment (log kow <3; following REACh guidance Document R7.1.15.4). Additionally, the substance has no cationic properties and the calculated logKoc of 2.77 also indicates low potential for adsorption to solid soil/sediment (following Table R.7.11-2, REACh-Guidance Documents). Thus, a simulation test on biodegradation in water and sediment needs notto be conducted.

 

Biodegradation in soil

The substance is determined to be poorly biodegradable in a study according to OECD 301B. Comparable degradation rates are expected for biodegradation in soil. In addition, a biodegradation in soil does need not to be conducted, if the substance can be expected to have a low potential for adsorption: A log kow of 1.78 was determined which indicates low potential for adsorption to soil (log kow <3; following REACh guidance Document R7.1.15.4). Additionally, the substance has no cationic properties and the calculated logKoc of 2.77 also indicates low potential for adsorption to solid soil (following Table R.7.11-2, REACh-Guidance Documents). Thus, a study on biodegradation in soil needs notto be conducted.