Registration Dossier
Registration Dossier
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EC number: 940-422-0 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
ADSORPTION/DESORPTION
GENERAL
For the registration substance only data on sorption to soil and sediment are missing. But for the carbon chain homologue Glucamide 18,18u (Oleyl Glucamide) an OECD 106 Sorption study with radiolabelled material is available. The data from this study indicate that the sorption behaviour is complex and not simply correlated to the organic carbon content. Therefore results from property estimation models on Koc cannot explain the measured data. This also means that a prediction of the sorption properties of the registration substance from the measured data of Glucamide 18u is not possible. As the registration substance is rapidly biodegraded in sewage treatment plants, soil and sediment high sorption constants do influence the PECs and RCRs only marginal. Therefore, the Glucamide 18u sorption data will be used for the registration substance as well which may be a worst case but most likely more reliable than the calculated data from property estimation models. As the sorption constant on primary sludge measured for Glucamide 12 (see IUCLID Chapter 5.4.1) are very high, the validity of the measurement is unclear and therefore these sorption data were not used in environmental exposure modelling of the registration substance but instead the data from the Glucamide 18u sorption study (see data below).
SORPTION MECHANISM
Glucamides consists of very different structural elements. One is the fatty acid with a C8 to C18 carbon chain most likely responsible for a classical sorption behavior (unspecific van der Waals interaction). The other structural element is the Glucamine with 5 Hydroxyl groups responsible for the hydrogen donor properties related to the interaction with acceptors e.g. negatively charged surfaces. The sorption behavior of Glucose is well studied (e.g. Olsson et al, 2010(http://dx.doi.org/10.1016/j.jcis.2010.09.023), Kuhn et al, 2012http://dx.doi.org/10.1016/j.lwt.2012.02.010)) demonstrating that adsorption is influenced by many parameter making it difficult to predict. But not only H Donor interaction takes places with charged surfaces but also with activated, moistured carbon (Yu Sen, 2013(http://hdl.handle.net/2069/2124)). Also trapping in porous media like zeolite is possible (Kuhn et al (2010). Therefore, it is not astonishing that the sorption behavior of the test item is non-linear and a simple linear correlation to the organic carbons content of the media is not observed. (see IUCLID Chapter 5.4.1)
For environmental exposure calculations for the registration substance, the median Kd values from soil (611 L/kg), sediment (7375 L/kg), primary sludge (173 L/kg) and activated sludge (488 L/kg) of the read across substance Glucamide 18,18u are used (see above).
HENRY'S LAW CONSTANT
The registration substance has a very vapour pressure of << 0.1 Pa at 20 °C and a water solubility of 49 mg/L at 20° C which corresponds to a very low Henry's Law Constant (HLC). EUSES 2.1.2 Exposure model calculates from these values a very low HLC of <0.6 Pa*m3/mol. The dimensionless air water partitioning coefficient Kaw of <2.5E-4 can be calculated from the HLC. HLC and Kaw confirm the low volatility of the registration substance.
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