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Measurement of Henry's law constants for C/sub 1/ and C/sub 2/ chlorinated hydrocarbons

Journal Article · · Environ. Sci. Technol.; (United States)
DOI:https://doi.org/10.1021/es00156a012· OSTI ID:5671267

A modification to the EPICS procedure for measuring Henry's constants is proposed, wherein the original assumption of equal solute mass additions to bottle pairs has been eliminated via a gravimetric accounting, resulting in increased precision. The modified procedure was applied to 13 volatile C/sub 1/ and C/sub 2/ chlorinated hydrocarbons at temperatures from 10 to 35/sup 0/C, representing a range in dimensionless Henry's constant (H/sub c/) of from 0.05 to 1.8. The mean coefficient of variation (CV) in Henry's constant was 3-4%; however, by employment of greater differentials in liquid volumes within bottle pairs, CV may be reduced to an estimated 2.5-3.5%. Precision deteriorates markedly at very low Henry's constants (i.e., H/sub c/ < 0.1). Dilute aqueous mixtures of volatile solutes (with methanol also present) were employed in these measurements of Henry's constant. Comparison with previous results from single-solute assays supports the use of mixtures - at least within the range explored here. The effects of ionic strength on apparent Henry's constants were evaluated for six of the compounds, with KCl concentrations up to 1.0 M. The practical impact of ionic strength appears to be minimal. Salting-out coefficients (k) ranged from 0.107 to 0.213 L mol/sup -1/ at 20/sup 0/C. 8 references, 5 figures, 3 tables.

Research Organization:
Cornell Univ., Ithaca, NY
OSTI ID:
5671267
Journal Information:
Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 21:2; ISSN ESTHA
Country of Publication:
United States
Language:
English

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Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (-1989)
520200 -- Environment
Aquatic-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AQUEOUS SOLUTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DATA
DISPERSIONS
ENVIRONMENTAL TRANSPORT
EQUATIONS
EXPERIMENTAL DATA
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
MASS TRANSFER
MEASURING METHODS
MIXTURES
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SOLUTIONS
VOLATILITY