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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 individual chain lengths of the monomers.

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

 

The log Koc of the substance is judged to be 4 < log Koc 5. Thus, an adsorption to organic carbon in soils and sediments of Fatty acids, C16-18 and C18-unsatd., branched and linear (CAS No 68955 -98 -6) is expected. Therefore, soil and sediment are expected to be the main compartments in regard to distribution based on the low water solubility and 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.