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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
Principles of method if other than guideline:
In addition to the test conducted according to OECD 106 , the Koc value was estimated using PKOC v1.66.
GLP compliance:
not specified
Type of method:
other: estimation by calculation and experimental results
Radiolabelling:
no
Test temperature:
25 °C
Analytical monitoring:
yes
Type:
Koc
Value:
87
Temp.:
25 °C
Remarks on result:
other: value determined in test according to OECD 106
Type:
log Koc
Value:
1.94
Temp.:
25 °C
Remarks on result:
other: value determined in test according to OECD 106
Type:
Koc
Value:
159
Remarks on result:
other: Koc value as estimated using PKOC v1.66
Type:
log Koc
Value:
2.2
Remarks on result:
other: log Koc value as estimated using PKOC v1.66
Validity criteria fulfilled:
not applicable
Conclusions:
The log Koc (Koc) value of 4-chlorobenzonitrile was calculated to be 2.2 (159).
Executive summary:

The Koc value was estimated using PKOC v1.66. The log Koc (Koc) of 4-chlorobenzonitrile was calculated to be 2.2 (159) (US EPA 2004). Experimental results (Wu et al. 2001. Estimation of the sorption of substituted aromatic compounds on the sediment of the Yangtse River. Bull Environ Contam Toxicol 66: 777 -783) show similar results: log Koc (Koc) = 1.94 (87).

Therefore, it can be concluded that 4-chlorobenzonitrile has only a low adsorption potential to soil.

Adsorption to aerosols is not expected. 4-chlorobenzonitrile has a vapour pressure of 3 Pa at 20 °C (see IUCLID section 4.6). With an average load of aerosols in the atmosphere (according to TGD, EU 2003, the specific aerosol surface is 5.6 * 10^-6 cm²/cm³), less than 0.1 % of 4-chlorobenzonitrile is adsorbed to aerosol particles.

Description of key information

The log Koc (Koc) of 4-chlorobenzonitrile was calculated to be 2.2 (159).

Key value for chemical safety assessment

Koc at 20 °C:
159

Additional information

The Koc value was estimated using PKOC v1.66. The log Koc (Koc) of 4-chlorobenzonitrile was calculated to be 2.2 (159) (US EPA 2004). Experimental results (Wu et al. 2001. Estimation of the sorption of substituted aromatic compounds on the sediment of the Yangtse River. Bull Environ Contam Toxicol 66: 777 -783) show similar results: log Koc (Koc) = 1.94 (87).

Therefore, it can be concluded that 4-chlorobenzonitrile has only a low adsorption potential to soil.

Adsorption to aerosols is not expected. 4-chlorobenzonitrile has a vapour pressure of 3 Pa at 20 °C (see IUCLID section 4.6). With an average load of aerosols in the atmosphere (according to TGD, EU 2003, the specific aerosol surface is 5.6 * 10^-6 cm²/cm³), less than 0.1 % of 4-chlorobenzonitrile is adsorbed to aerosol particles.