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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Introduction 
No determination was possible according to Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, due to the following reason:
An assessment of the emulsification properties of the test item was carried out with the test item prepared in water saturated n-octanol and shaken with an equal amount of n-octanol saturated water. Observations after this test showed that the two immiscible phases emulsified easily; additionally, after 1 hour standing, there were still three layers visible, the middle layer being a white emulsion. It was therefore considered that as the test item also gave a positive surface-active result in the Surface Tension test (See section 7.6 Surface Tension Harlan Laboratories study number 41003463), the test item can be considered to be surface-active. Surface-active items are not suitable for determination by the HPLC method.

Key value for chemical safety assessment

Koc at 20 °C:
5.648

Additional information

Introduction

No determination was possible according to Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, due to the following reason:

  • An assessment of the emulsification properties of the test item was carried out with the test item prepared in water saturated n-octanol and shaken with an equal amount of n-octanol saturated water. Observations after this test showed that the two immiscible phases emulsified easily; additionally, after 1 hour standing, there were still three layers visible, the middle layer being a white emulsion. It was therefore considered that as the test item also gave a positive surface-active result in the Surface Tension test (See section 7.6 Surface Tension Harlan Laboratories study number 41003463), the test item can be considered to be surface-active. Surface-active items are not suitable for determination by the HPLC method.

Method

Therefore, the adsorption coefficient was estimated using thecomputer-based specialist estimation software, KOCWIN, version 2.00 (February 2009), © 2000-2008 U.S. Environmental Protection Agency. 

The substance was modelled without the zinc atom as the per EPIsuite recommendations.

Results

Using the software, the adsorption coefficient (log10 Koc) has been estimated to be 5.050  (MCI method) and in the 5.648       (Kow method).