Crude Tall Oil (CTO) is obtained from the wood pulping industry. It is a dark brown viscous liquid extracted and processed from softwoods and hardwoods. CTO has a complex composition of fatty acids, resin acids, and neutrals.

Water solubility

Description of key information

Water solubility (whole substance): 7.35 x 10-2 g/l 20 °C, pH 4.6 - 5.5 (OECD 105).
Water solubility (individual constituents of the substance): 1.1E-04 - 1.3E+01 mg/l (QSAR)

Key value for chemical safety assessment

Water solubility:

0.073 g/L

at the temperature of:

20 °C

Additional information

Water solubility has been determined in a GLP study for the registered substance using a method in accordance to OECD 105. CTO has a water solubility of 7.35x 10^-2g/l 20 °C, pH 4.6 - 5.5. In another study, a water solubility of 9 mg/l, (20 °C, pH 2) in its entirety as a complex substance using the same method stated above is obtained for the test substance. CTO is found to be slightly soluble in water.

CTO is a UVCB substance with about 80 constituents including fatty acids, resin acids, neutrals such as alcohols and high molecular weight polymeric compounds,. For environmental risk assessment, the properties of the substance are assessed using the 'block approach'. The water solubility of each 'block' has been determined based on the weighted average of each constituent in the block. Predicted water solubility of 1.1E-04 - 1.3E+01 mg/l and 1.2E-03 - 5.7E+00 mg/l were determined for constituents and all 'blocks' in CTO respectively.