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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is expected.

Key value for chemical safety assessment

Additional information

A log Koc of above 5.6 (which is the log Koc of 4,4'-DDT) was calculated for the substance in a HPLC-Screening method (Fraunhofer-lnstitut fur Umweltchemie und Okotoxikologie, 1996). The adsorption-coefficient of the test substance could not be correctly determined by means of the normal evaluation procedure of the HPLC-screening method, because the retention time (tn) and the corresponding capacity factor (k') of the test substance are outside the calibration range. Furthermore, it is impossible to extend the calibration range to higher log Koc-values, because 4,4'-DDT is the substance with the highest log Koc-value, which had been determined by means of the OECD guideline 106. It is essential for the application of the calibration procedure in the HPLC-screening method to have a log Koc-value, which had been determined by means of the OECD guideline 106. That means there will be no other set of reference substances which will allow for more than an estimation of the adsorption coefficient of the test substance.

However, the log Koc indicates that an adsorption of the substance to soil and sediment is to be expected .

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