Aqueous solubility and octanol-water partition coefficient (Kow) of C60

ENVR 100

Pradnya P. Kulkarni, pkulkarn@purdue.edu and Chad T. Jafvert, jafvert@ecn.purdue.edu. School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907
To assess the risk and fate of fullerene C60 in the environment, data on potential exposure concentrations, reactivity and stability in various media, toxicity and bioaccumulation potential are required. In this study, partitioning of C60 was studied in octanol-water and toluene-water systems. The log Kow of C60 was measured to be 6.67. The estimated aqueous solubility of C60 calculated from the partitioning data was 7.96 × 10-6 mg/L. Additionally, solubility of C60 was measured in mixtures of ethanol-water and tetrahydrofuran-water with the organic solvent volume fraction ranging from 0.5 to 1. Addition of 50% ethanol and tetrahydrofuran in water increased the solubility by four and five orders-of-magnitude, respectively. The aqueous solubility value obtained from partitioning studies was evaluated by applying Wohl's equation to model the solubility data over the range (0.5 to 1) of co-solvent-water ratios. The bioconcentration factor for C60 was estimated based on its Kow.
 

Environmental Behavior and Fate of Manufactured Nanomaterials
8:30 AM-12:15 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 235, Oral

Division of Environmental Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008