Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

No studies on adsorption are available for substances belonging to the category C7-C9 aliphatic hydrocarbon solvents. However, category members are not expected to sorb significantly to organic matter in soil, sediment, and wastewater solids based on calculated log Koc values, with octane having a log Koc of 2.64.

Fugacity-based multimedia modelling provides basic information on the relative distribution of a chemical between selected environmental compartments (i.e. air, soil, water, sediment, suspended sediment, and biota). A widely used fugacity model is the EQC (Equilibrium Criterion) Level I model (Mackay et al. 1996). This models requires the input of basic physico-chemical parameters (i.e. molecular weight, melting point, vapor pressure, water solubility, log Kow). Available results of the Mackay Level I environmental distribution model show that members of the C7 to C9 hydrocarbon solvents category have the potential to partition primarily to air. These results can be explained by their relatively high vapor pressures.

The distribution of the substance in the environmental compartments, air, water, soil, and sediment, has been further calculated using the PETRORISK Model, version 5.2. Based on the regional scale exposure assessment, the multimedia distribution of the substance is 42% to air, 23% to water, 8.2% to soil, and 27% to sediment. Distribution modeling results are included in the 'Multimedia distribution modeling results' tab in the PETRORISK spreadsheet attached to Section 13 of the CSR.