Registration Dossier
Registration Dossier
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EC number: 224-929-8 | CAS number: 4559-86-8
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Administrative data
Description of key information
Additional information
The photodegradation of tetrabutyl urea in air by reaction with OH radicals was calculated via EPIWIN v4.00, AOPWIN v1.92. Based on a reaction rate constant of 31.76 x 10E-12 cm³/molecule x s (at 25°C) and a OH radical concentration of 5 x 10E5 radicals/cm³ (24 h d) a half-life t1/2=12.125 h was calculated. According to REACH Regulation (Annex VIII, 9.2.2.1, column II), the study on hydrolysis as a function of pH does not need to be done if the test substance is hardly soluble in water. As could be shown in a study report the performance of the test on hydrolysis was experimentally not possible due to the low water solubility of tetrabutyl urea. The ready biodegradation of tetrabutyl urea was investigated in a study conducted according to OECD Guideline 301 F over a period of 28 days and using activated sludge as inoculum collected from a sewage treatment plant treating mainly municipal wastewater. The test item proved to be not readily biodegradable under the test conditions employed (<=1.3% biodegradation after 28 d). The functional control reached the pass level > 60% after 14 d. In the toxicity control containing both test and reference item 32.2% biodegradation occurred within 14 d thus indicating that the test item was not inhibitory to the inoculum at the concentration tested. The calculation of the bioaccumulation factor BCF via EPIWIN v4.00, BCFBAF v3.00 yielded values of 112 L/kg ww (regression based method) and 166 (dimensionless, Arnot-Gobas method). The soil sorption coefficient Koc was calculated via EPIWIN v4.00, KOCWIN v2.00. The calculations yielded values of 6376 (using the MCI method) and 9441 L/kg at 25°C (using the Kow method). Henry's Law constant was calculated via EPIWIN v4.00, HENRYWIN v3.20. The calculation yielded a value of 0.0257 Pa x m³/mole at 25°C using the bond method. The calculation of Henry's Law constant according to the equation H=vp/ws and using EPIWIN estimates resulted in a Henry's Law constant of 3.58 Pa x m³/mole.
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