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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Kd was derived from measurements in 60 paired samples of sludge and effluent in 18 sewage treatment plants in southern and northern Europe. The sampling procedure and analyses were carried out with a high level of quality control and the variation due to analytical error was low. The ratio between the concentration in effluent and the concentration in sludge, expressed as the log Kd-value is fairly constant for all the data of this monitoring study. 80% of the values is between 3.2 and 3.75, which is on a linear scale only a factor of 3.5. When all log Kd-values are considered together the extreme values for OTNE varied between 2.98 and 4.18 which on a linear scale represents a factor of 16. The mean Kd-value was used to estimate log Koc, using the mean fraction of organic carbon in the sludge, resulting in log Koc = 4.12.

Key value for chemical safety assessment

Koc at 20 °C:
12 589

Additional information

[LogKoc: 4.12]