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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The substance is not expected to adsorb to suspended solids and sediment based upon the Koc of  7.9  to 75.4 mL/g.

Key value for chemical safety assessment

Koc at 20 °C:
75.4

Additional information

The mobility of cyprosulfamide in soil can be estimated on the basis of their sorption constants and soil half life values. One GLP study is available for the substance. This study was conducted as batch equilibrium method according to OECD Guideline 106 (Fliege, 2004). Freundlich adsorption constants normalized to the organic carbon (OC) content KF,OC were determined for the test substance in seven soils with values ranging from 7.9 to 75.4 mL/g. According to the mobility classes of Briggs[1] these data classify cyprosulfamide as ‘mobile’ to ‘intermediately mobile’ in soil. The data indicated a clear correlation with the soil pH: the lower the soil pH the higher the sorption constant.

The adsorption potential of the test substance is low.

 

 [1]Briggs, G. G. (1973): A simple relationship between soil adsorption of organic chemicals and their octanol/water partition coefficients, Proc. 7thBritish Insecticide and Fungicide Conference, Nottingham/UK

 

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