Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability

Photodegradation in air

The calculated degradation rate of the test substance with hydroxyl radicals (OH) is 186.013 x 10E-12 cm3/molecule/sec. The atmospheric degradation half-life of the test substance due to reactions with ozone is 0.058 days. After evaporation or exposure to the air, the product will be rapidly degraded by photochemical processes.

 

Hydrolysis

According to structural properties, hydrolysis in not expected/probable. According to literature data of Harris (1990), Kollig et al. (1993) and Boethling & Mackay (2000), hydrolysis of the substance is not expected.

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 not to 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 not to be conducted.

Bioaccumulation

Bioaccumulation: aquatic / sediment

According to Annex IX, Section 9.3.2 column 2 of REACH Regulation (EC) No 1907/2006 a study on bioaccumulation need not to be conducted, if the substance has a low potential for bioaccumulation (for instance a log Kow ≤ 3) and/or a low potential to cross biological membranes. The retrieved logPow of 1.78 is below the threshold value of 4 (according to GHS criteria) and thus, accumulation in organisms of the test substance is not expected.

 

Transport and distribution

Adsorption/desorption

According to Annex IX, Section 9.3.3, column 2 of REACH Regulation (EC) No 1907/2006 a study on adsorption/desorption need not be conducted, If based on the physicochemical properties the substance can be expected to have a low potential for adsorption.The substance can be expected to have a low potential for adsorption (following REACh guidance Document R7.1.15.4): A log kow of 1.78 was determined which indicates low potential for adsorption to soil (log Pow < 3). Additionally, the substance has no cationic properties.

 

Henry´s constant

The Henry's law constant was calculated to be 3.22E-17 Pa m3/mol at 25 °C (calculated by HENRYWIN v3.20). The substance will not evaporate into the atmosphere from the water surface.