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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The study by Matt, F.J.; Blair, J.E.; Obrist J.J.; Puhl R.J. (1985) was selected as the key study for this endpoint as it is considered a reliability 1 study using the batch equilibrium method. The Koc values obtained ranged between 42 and 96 (mean Koc= 61 and 1/n = 0.9). 

Key value for chemical safety assessment

Koc at 20 °C:
61

Additional information

The study by Matt, F.J.; Blair, J.E.; Obrist J.J.; Puhl R.J. (1985) was selected as the key study for this endpoint as it is considered a reliability 1 study using the batch equilibrium method to EPA guideline 163-1. Adsorption/desorption of 14C-Dinoseb was determined in four soil types by adding 10mL test item of initial concentrations of 0.484, 0.972, 4.85, and 9.79 ppm to 1 g of dried soil in culture tubes. Tubes were shaken for 1 hour at 25°C, centrifuged, and 1 mL aliquots removed for analysis via LSC. After removal of aliquots, 5 mL of 0.01M calcium nitrate solution was added to re-establish a 10mL volume. Tubes were shaken, centrifuged, and aliquots analysed via LSC. The Koc values obtained ranged between 42 and 96 (mean Koc = 61 and 1/n = 0.9).

A further study by Blair, JE (1985) was utilised as a supporting study as it was considered not to address the endpoint as directly as the study selected as the key for this endpoint.

[LogKoc: 1.79]