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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Measured adsorption coefficients (Koc) for the major constituents, namely phenol and 4,4’-isopropylidenediphenol, range from  14 to 91 L/kg and from 251 to 1507 L/kg (average 750 +/ 345 L/kg), respectively, suggesting low to moderate sorption potential.  
Estimated adsorption coefficients for several of the minor impurities are higher, ranging from 1871 to 41420 L/kg suggesting that adsorption to soils and sediments could be of potential importance.

Key value for chemical safety assessment

Additional information

The environmental properties of the reaction mass of phenol and 4,4’-isopropylidenediphenol was assessed by examination of the properties of the constituents and impurities of the mixture and using this information in a read across approach as described in section 13. 

 

Measured adsorption coefficients (Koc) for the major constituents, namely phenol and 4,4’-isopropylidenediphenol, range from 14 to 91 L/kg and from 251 to 1507 L/kg (average 750 +/ 345 L/kg), respectively, suggesting low to moderate sorption potential. 

Estimated adsorption coefficients for several of the minor impurities are higher, ranging from 1871 to 52560 L/kg suggesting that adsorption to soils and sediments could be of potential importance.

 

Adsorption potential of the minor impurities of the substance was assessed using both experimental and QSAR estimation methods. Experimental determination was performed in accordance with OECD 121 (estimation by HPLC) with a test material, 2-Acetone, polymer with phenol, which is a suitable surrogate for the reaction mass of phenol and 4,4’-isopropylidenediphenol.  Log Koc values based on retention times for the various components of the test chemical ranged from 1.57 to 4.52. The average adsorption coefficient for all peaks in the mixture, calculated based on an area percentage, was 631 L/kg (log Koc = 2.8 L/kg). Adsorption coefficients for the minor components were also estimated using QSAR models and ranged from 1871 to 41420 L/kg (log Koc range 3.3 to 4.7) and are in agreement with the experimental results.