Title

Volatility of chlorinated n-alkanes (C10-C12): Vapor pressures and Henry's law constants

Document Type

Article

Publication Date

1998

Publication Title

Environmental Toxicology and Chemistry

Volume

17

Issue

7

First Page

1252

Last Page

1260

DOI

10.1897/1551-5028(1998)017<1252:VOCNAC>2.3.CO;2

Abstract

Polychlorinated n-decanes, n-undecanes, and n-dodecanes with chlorine numbers of two to six were utilized to assess physicochemical properties of short-chain (C10-C13) chlorinated paraffins. Subcooled-liquid vapor pressures (Ps), determined using the vapor pressure-gas-liquid chromatography correlation technique, ranged from 1.4 x 10-4 to 0.50 Pa at 25°C among the compounds studied. Vapor pressures tended to decrease with increasing carbon chain length and degree of chlorination according to the correlation: log P = -0.353(C No.) - 0.645(Cl No.) + 4.462. Henry's law constants (Hs), determined using gas-sparging techniques, ranged from 17.7 to 0.68 Pa·m3/mol for tetra- and pentachloro congeners at 23°C. The Henry's law constants for 1,10-dichlorodecane and 1,12-dichlorododecane, 499 and 648 Pa·m3/mol respectively at 25°C, were calculated from experimentally determined vapor pressures and water solubilities. Henry's law constants decreased with increasing degree of chlorination.

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