Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Several reliable biodegradation studies are available for members of this category, for rosin and for monovalent and divalent salts of rosin. Based on the results of these studies, members of the category Rosin, hydrogenated rosin and their salts would be considered readily biodegradable.

 

Information on accumulation in aquatic organisms is vital for understanding the environmental behaviour of a substance. Accumulation is a general term for the net result of absorption (uptake), distribution, metabolism and excretion (ADME) of a substance in an organism.

 

A study is available with measured BCF values for various rosin acids. Rosin acids are the predominant components of rosin (Niimi and Lee 1992). Therefore, it is considered appropriate to read across from rosin acids. Rainbow trout (Oncorhynchus mykiss) were exposed to nine resin acids that included abietic, dehydroabietic, chlorodehydroabietic, dichlorodehydroabietic, neoabietic, pimaric, isopimaric, sandaracopimaric, and palustric acids. Bioconcentration factors (BCFs) for these acids ranged from <25 to 130 among fish that were exposed to mean waterborne concentrations of 0.7 to 3.6 µg/L for 20 days. Total free and conjugated acid concentrations ranged from 1 to 3 mg/kg on a whole body basis. Elimination rates were also monitored over a 10-day depuration period, although no detectable levels were observed. Based on initial chemical concentrations, it was concluded that the half-lives of these acids were < 4 days. 

 

Burggraaf et al. (1996) determined BCF values for mussels (Hyridella menziesi) exposed to effluent from a pulp and paper mill. Concentrations of resin acids (pimaric acid, isopimaric acid, dehydroabietic acid, abietic acid and 14 -chlorodehydroabietic acid) were analysed in mussels and in the effluent for a 28d exposure phase, followed by a 21d depuration phase. BCF values for the individual resin acids ranged from 110 to 330 L/kg.

 

Measured BCF values for resin acids indicate that substances in this category are not bioaccumulative.

 

QSAR estimation using BCFBAF v3.00, and BCFBAF v3.01, of the EPISUITE 4.0 software indicate that the calculated BCF values for members of the Rosin, hydrogenated rosin and their salts category are below the B criteria of 2000 L/kg.