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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Justification for type of information:
Estimated data generated using the EPI Suite model developed by the USEPA.
Qualifier:
according to
Guideline:
other: Modeling database
Principles of method if other than guideline:
Prediction done using KOCWIN Program (v2.00)
GLP compliance:
not specified
Type of method:
other: MCI Method
Media:
soil
Radiolabelling:
not specified
Test temperature:
25 deg.C
Analytical monitoring:
not specified
Type:
Koc
Value:
652 300 000 L/kg
Temp.:
25 °C
Remarks on result:
other: Log Koc= 8.8145 (estimated by MCI method)
Validity criteria fulfilled:
not specified
Conclusions:
The Soil Adsorption Coefficient i.e. Koc value of test chemical was estimated using EPI suite KOCWIN Program (v2.00) as 6.523e+008 L/kg (log Koc= 8.8145) by means of MCI method at 25 deg. C. This log Koc value indicates that test chemical has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.
Executive summary:

The Soil Adsorption Coefficient i.e. Koc value of test chemical  was estimated using EPI suite KOCWIN Program (v2.00) as 6.523e+008 L/kg (log Koc= 8.8145) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical  has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

Description of key information

The Soil Adsorption Coefficient i.e. Koc value of test chemical  was estimated using EPI suite KOCWIN Program (v2.00) as 6.523e+008 L/kg (log Koc= 8.8145) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical  has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

Key value for chemical safety assessment

Koc at 20 °C:
652 300 000

Additional information

Two different studies have been reviewed for test chemical and its read across chemical for adsorption endpoint of test chemical and their results are summarized below.

 

In first study the Soil Adsorption Coefficient i.e. Koc value of test chemical  was estimated using EPI suite KOCWIN Program (v2.00) as 6.523e+008 L/kg (log Koc= 8.8145) by means of MCI method at 25 deg. C.  

 

Another study was reviewed from authoritative database (HSDB) in this study the adsorption coefficient (Koc) value was calculated using a structure estimation method based on molecular connectivity indices. The adsorption coefficient (Koc) value of test substance was estimated to be 29200 dimensionless (Log Koc = 4.4653).

 

By considering results of both the studies log Koc value was determined to be in range of 4.4653- 8.8145 This range log Koc value indicates that the substance has a very strong sorption to soil and sediment and therefore has negligible migration potential to ground water.