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Environmental fate & pathways

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All substances in the dimerized fatty acids category are derived from the dimerisation of typical, (unsaturated) fatty acids of the parent triglycerides. QSAR estimates can be made on the monomers with individual chain lengths.

A low volatilisation potential is expected due to estimated negligible vapour pressures (U.S. EPA HPV report, 2009).

Henry’s Law Constant (25°C) calculated based on HENRYWIN programme v3.20 (EPISUITE) is in the range 2.93-42.1 Pa m³/mol. Thus, a slow volatilisation of Isooctadecanoic acid from the water phase is expected.

 

The log Kow of the substance is judged to be >4. Thus, an adsorption to organic carbon in soils and sediments of Isooctadecanoic acid (CAS No 30399 -84 -9) is expected. Therefore, soil and sediment are expected to be the main compartments in regard to distribution based on the low water solubility and the high adsorption coefficient. Furthermore, no potential for volatilization is expected, so air is not a compartment of concern.

References:

U.S.Environmental Protection Agency, High Production Volume Chemicals Branch, Risk Assessment Division (2007). Screening-Level Hazard Characterization of High Production Volume Chemicals – Tall Oil Fatty Acids and Related Substances. pp 1-13. Report date: October 2007.