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Environmental fate & pathways

Adsorption / desorption

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adsorption / desorption, other
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Several experimental studies, published in peer reviewed literature, notable limitations in design and/or reporting, but adequate for assessment
Principles of method if other than guideline:
The equation from TGD was used to calculate the key value
GLP compliance:
not specified
141 L/kg
log Koc
2.15 dimensionless
adsorption / desorption: screening
Data waiving:
other justification
Justification for data waiving:
the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter

Description of key information

From a formal point of view, a study on adsorption/desorption does not need to be conducted, because the log kow for TCE is 2.53, which is is clearly below the threshold of 3.

The calculated Log Koc for trichloroethylene of 2.15 (141 L/kg) is taken for assessment.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

The available measured values range from 30 to 921. Rather than to try to derive a single value from the available data or select one of these values as the key parameter, the Koc value is calculated from the octanol-water partitioning coefficient (log Kow = 2.53) using the equation from the TGD (hydrophobics). This results in a Koc value of 141 l/kg (log value is 2.15), which is taken as reliable value for assessment.