Temperature dependence of the aqueous solubilities of highly chlorinated dibenzo-p-dioxins

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Environmental Science and Technology; (United States)

DOI:https://doi.org/10.1021/es00071a011· OSTI ID:5466447

Friesen, K J; Webster, G R.B. ^[1]

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1. Univ. of Manitoba, Winnipeg (Canada)

The aqueous solubilities of a series of highly chlorinated dibenzo-p-dioxins (PCDDs) are reported over an environmentally significant temperature range of 7-41{degree}C. The authors have demonstrated that aqueous solubilities may be determined by the dynamic coupled-column liquid chromatography or generator column method with a column loading as low as 0.0002% by weight. The enthalpies of solution of the solid solutes (1,2,3,7-tetra-, 1,2,3,4,7-penta-, 1,2,3,4,7,8-hexa-, and 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin) ranged from 39.8 to 47.5 kJ/mol, in good agreement with literature data for lower chlorinated dioxins. A brief thermodynamic analysis of the results indicated that entropy changes may be more important than enthalpy changes in limiting the aqueous solubilities of these solutes over the temperature range under consideration. The total surface areas (TSAs) and total molecular volumes (TMVs) of these solutes show a linear relationship with the logarithm of the aqueous activity coefficients.

• OSTI ID: 5466447
• Journal Information: Environmental Science and Technology; (United States), Vol. 24:1; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
DIOXIN
SOLUBILITY
AIR POLLUTION MONITORING
AQUEOUS SOLUTIONS
MEDIUM TEMPERATURE
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
DISPERSIONS
HETEROCYCLIC COMPOUNDS
MIXTURES
MONITORING
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUTIONS
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)