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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information

The US EPA EPI Suite (v3.12) program (US EPA 2000) was used to estimate the sediment partition coefficient (Koc) or log Koc in order to assess the adsorption/desorption potential,  The main components (e.g., C20-C22) in the registered substance have calculated log Koc values ranging from 5.81 to 6.37.  Based on these findings, the registered substance and its main components or constituents have the potential to significantly adsorb to organic matter in sediment. 

Key value for chemical safety assessment

Additional information

The US EPA EPI Suite (v3.12) program(US EPA 2000) was used to estimate the sediment partition coefficient (Koc) or log Koc of the C18 to C24 components in order to assess the overall adsorption/desorption potential of the registered substance (the reaction products of 1-decene, 1-dodecene, and 1-octene, hydrogenated). 


The calculated log Koc values for the C18-C24 components were:

C18 H38    log Koc = 5.28-5.31

C20H42    log Koc = 5.81-5.84

C22H46    log Koc = 6.37

C24H50    log Koc = 6.90

Registrant's comments: The US EPA EPI-Suite modeling program has been extensively used in the OECD SIDS and the US EPA High Production Volume (HPV) programs and more importantly, the US EPI-Suite program is an integrated predictive tool in the OECD Toolbox to calculate physico-chemical and environmental fate properties for chemicals. Hence, the need to supply QMRF and QPRF for commonly applied EPI-Suite models is not warranted given its already accepted use in global regulatory notifications and its integration and underpinning in the OECD Toolbox for REACH