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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
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
Justification for type of information:
The test item is a salt. The HPLC method is not applicable to substances such as this.

The use of computer-based estimation programs and/or Quantitative Structure Activity relationships (QSAR’s) for materials of this nature are also considered invalid since most of these methods are based on estimations of Log P , itself prone to error due to the
effects of ionic charge. Prediction methods are likely to be subject to serious error since they do not take into account the salted nature of the test item. The log Pow result has been determined, however this is still a less than value due to the low determined results within the organic samples. Although correction factors can be applied, it has been shown that QSAR models can significantly under estimate the adsorption coefficient of ionic substances.

Description of key information

The test item is a salt. The HPLC method is not applicable to substances such as this.

The use of computer-based estimation programs and/or Quantitative Structure Activity relationships (QSAR’s) for materials of this nature are also considered invalid since most of these methods are based on estimations of Log P , itself prone to error due to the effects of ionic charge. Prediction methods are likely to be subject to serious error since they do not take into account the salted nature of the test item.  The log Pow result has been determined, however, this is still a less than value due to the low determined results within the organic samples.  Although correction factors can be applied, it has been shown that QSAR models can significantly underestimate the adsorption coefficient of ionic substances.  

For risk assessment purposes the logKoc of the substance will be set at the minimum as validated in the EUSES program

Key value for chemical safety assessment

Koc at 20 °C:
1

Additional information

[LogKoc: 0.0]