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Environmental fate & pathways

Hydrolysis

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No testing was carried out using Method C7 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC) as the organic bistridecylsulfosuccinate content of the test material was determined to be essentially insoluble in water.  The experimentally determined limit value of equivalent to less than or equal to 2.2 x 10-5 g/l of test material in solution may still significantly overestimate its true solubility, due to the value being constrained by the analytical method applied to the determination.  Computer estimation of the water solubility performed using structural information supplied by the Sponsor, again entered into the software as a sodium salt to indicate a hydrophilic anionic functional group, resulted in an extremely low predicted water solubility value of 3.7 x 10-10 g/l for bistridecylsulfosuccinate (WSKOWWIN, version 1.41, © 2000, US Environmental Protection Agency).  This estimated water solubility value was derived directly from the computer estimated partition coefficient value detailed, complete with validation, in Section 10 of this report.
The test material was predicted to be unstable in the presence of water. This was consistent with the presence of ester functional groups in the bistridecylsulfosuccinate content of the test material. Estimation of the hydrolytic half-life using available software packages was not considered reliable as they did not support the sulfonate fragment of the molecule, and the electrophilic properties of this group may significantly influence the rate of hydrolysis, especially due to its close proximity to the ester functional groups.

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Abiotic Degradation, Hydrolysis as a Function of pH. No testing was possible using Method C7 of Commission Directive 92/69/EEC as the organic bistridecylsulfosuccinate content of the test material was determined to be essentially insoluble in water. The experimentally determined limit value of equivalent to less than or equal to 2.2 x 10-5g/l of test material in solution may still significantly overestimate its true solubility, due to the value being constrained by the analytical method applied to the determination. Computer estimation of the water solubility performed using structural information supplied by the Sponsor resulted in an extremely low predicted water solubility value of 3.7 x 10-10g/l for bistridecylsulfosuccinate (WSKOWWIN, version 1.41, © 2000, US Environmental Protection Agency). EEC Method C7 limits the maximum permitted sample solution concentration to half that of the saturation water solubility of the test material, and therefore no analytical work was possible within the constraints of the guideline.