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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:
other:
Justification for type of information:
In accordance with column 2 of REACH Regulation (EC) No 1907/2006, Annex VIII, section 9.3.1, the test on adsorption/desorption screening does not need to be conducted as the substance zinc cyanide can be expected to have a low potential for adsorption based on the octanol water partition coefficient. The theoretical, calculated log Pow is - 2.31 (estimated with KOWWIN v1.68), i.e. very low, as expected for an inorganic substance.

Description of key information

In accordance with column 2 of REACH Regulation (EC) No 1907/2006, Annex VIII, section 9.3.1, the test on adsorption/desorption screening does not need to be conducted as the substance zinc cyanide can be expected to have a low potential for adsorption based on the octanol water partition coefficient. The theoretical, calculated (EPIWIN) log Pow is - 2.31, i.e. very low, as expected for an inorganic substance.

Nevertheless, for CSA purposes, a value must be provided.

There are no experimental value for this endpoint. Estimated values have been generated by QSAR Methods. The calculation methods and Koc values are reported here below:

- MCI Method from KOCWIN v2.0 with the CAS No of the substance as input = 3.334 L/kg

- LogKow Method from KOCWIN v2.0 with the CAS No of the substance as input = 2.702 L/kg

- Estimation of Log Koc by TGD (2003) Equation for non hydrophobics (default QSAR) with the log kow of the substance as input (-2.31 estimated with KOWWIN v1.68) = 0.659 L/kg

ECHA Guidance (chapter R.7.a,paragraph R.7.1.15) recommends calculating the Koc endpoint value as the geometric mean of results obtained by means of QSARs. Therefore, a key value for chemical safety assessment is calculated by the geometric mean of the values cited above:

Geometric mean of koc = 1.81 L/kg.

This geometric mean value is used as input parameter for Environmental Risk Assessment.

Key value for chemical safety assessment

Koc at 20 °C:
1.81

Additional information