Registration Dossier

Environmental fate & pathways

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Experimental results are available for biodegradation in water (screening test) and soil adsorption. QSAR predictions were applicable to determine the phototransformation in air, aquatic bioaccumulation and the Henry´s Law Constant of the test substance. Experimental investigations concerning hydrolysis and biodegradation in water and sediment (simulation tests) as well as in soil can be waived according to REACH Regulation.

Further information concerning environmental fate and pathways of the test substance are not available and not required for this registration under REACH.

Biodegradation in water was investigated according to OECD Guideline 301F, with monitoring of the oxygen consumption by an electrolytic respirometer system (Kung, 1998). Sludge from a domestic waste water treatment plant was used as inoculum, representing a diverse microbial population with high metabolism activities. The test material attained 5.9 % degradation after 28 days exposure and can therefore considered as "not readily biodegradable". However, due to the low water solubility of the substance (4.8 mg/L, Woolley and Mullee, 2003) and exposure considerations, no further investigations concerning biodegradation have to be conducted in accordance to REACH Regulation Annex IX, Section 9.2.1.2., column 2 and Annex IX, Section 9.2.1.4, column 2.

The soil adsorption coefficient was determined in an experiment with High Performance Liquid Chromatography (HPLC) according to EU Method C.19 (Fox and White, 2011). The logKoc value ranged from 3.28 to 4.01, indicating a medium to high binding range to soil particles.

Using the Bond Method of the computer program HENRYWIN v3.20 (EPIWIN software by US-EPA) a Henry´s Law Constant of 0.161 Pa*m³/mol was determined. The Group Method showed a value of 0.216 Pa*m³/mol.

The EPIWIN software AOPWIN v1.92 was used to predict the overall OH rate constant (gas phase reaction constant) as 38.67E-12 cm³/molecules-sec. The half-life in air is predicted as 3.30 hours when assuming a 12 h-day with an OH rate constant of 1.5E6 OH/cm³.

The aquatic Bioconcentration factor (BCF) was predicted with different QSAR model tools: BCFBAF v3.01 (EPIWIN software), CAESAR v1.0.0.11 and VEGA BCF model. In every case, the BCF was predicted higher than 100 L/kg. However, based on weight of evidence, bioaccumulation is expected to be below the criterion of concern.

Experimental investigations of hydrolysis were not conducted since this study can be waived in accordance with REACH Regulation. Furthermore, a QSAR prediction with HYDROWIN v2.00 is not possible for this type of chemical.