Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

The log Koc for Diurea 8 is calculated to be 5.45 - 14.03 using the Gerstl equation (Gerstl 1990). The log Koc for Diurea 8 was determined to be 4.97 - 10.0 using the MCI method and 4.81 - 10.25 using the log Kow QSAR models (US EPA 2009). However, Diurea 8 only occurs in a base oil grease and, in realistic use scenarios, the formulated greases are specifically designed to minimise leaching of the thickener.

The Henry's Law Constant of Diurea 8 was determined to range from 1.35E-13 to 3.91E-11 Pa-m3/mol using the bond estimation method and from 9.39E-6 to 1.04E-2 Pa-m3/mol using the group contribution method (US EPA 2009). It is expected that Diurea 8 would not enter the atmosphere and therefore volatilisation is not considered to be a relevant environmental transport process.

The isolated thickener is estimated to have a water solubility of less than 0.01 mg/L, a vapour pressure of less than 10 E-10 Pa and a log octanol-water partition coefficient of greater than 6 (Dawick 2012). On the basis of the physical-chemical properties, Diurea 8 is expected to reside within the grease base oil matrix. As such, Diurea 8 is not expected to partition to water, soil or air and hence is not anticipated to be available in the environment.