An Analytical Method to Determine Henry’s Law Constant For Selected Volatile Organic Compounds At Concentrations And Temperatures Corresponding To Tap Water Use

Tancrède, M.; Yanagisawa, Yukio

doi:10.1080/10473289.1990.10466813

Cited by 27 publications

(8 citation statements)

References 12 publications

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“…So far, every study has assumed constant heat of dissolution in the studied temperature intervals. We took the liberty to calculate regression equations according to eq 5 for studies where such were not given (33,40) or given as the less accurate eq 4 (19)(20)(21)39). Then heat of dissolution was assumed constant in each studied interval and calculated from the slope of the fitted straight line in a ln kH -1/T plot (data not shown).…”

Section: Resultsmentioning

confidence: 99%

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Henry's Law Constant for Trichloroethylene between 10 and 95 °C

Heron

Christensen

Enfield

1998

Environ. Sci. Technol.

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Experimental data on air−water partitioning of organic contaminants at temperatures above 40 °C is extremely scarce. We present Henry's law constants for trichloroethylene (TCE) in water between 10 and 95 °C determined using a modification of the Equilibrium Partitioning in Closed System (EPICS) procedure and calculated from vapor pressure and measured aqueous solubility data obtained by a column generator technique. The Henry's law constant for TCE increases by a factor of 20 between 10 and 95 °C, which is a dramatic change in volatility. Our results and a critical review of the thermodynamic equations suggest that the heat (enthalpy) of dissolution decreases with temperature and that Henry's law constants cannot be extrapolated to higher temperatures from the existing literature data. Heat of dissolution may be approximated by a linear function of temperature, leading to a simple equation for Henry's law constant ln k H = A − B/T + C ln T that fits the majority of the previously published experimental data. This equation is more precise than previously published equations, is valid for temperatures approaching 100 °C, and will assist in more accurate interpretation of Henry's law constant data for other chemicals of environmental concern.

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Section: Resultsmentioning

confidence: 99%

“…which has the form ln H ) A -B/Tln T showing that eq 4 used by several authors (14,15,(19)(20)(21)(22) appears to be incorrect. When narrow intervals are considered, relative variations in the absolute temperature is limited (e.g, less than 7% between 10 and 30 °C).…”

Section: Thermodynamic Backgroundmentioning

confidence: 99%

Henry's Law Constant for Trichloroethylene between 10 and 95 °C

Heron

Christensen

Enfield

1998

Environ. Sci. Technol.

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“…Two common methods used to directly measure H are the static equilibrium and the dynamic equilibrium methods. Static equilibrium methods include the equilibrium partitioning in closed system (EPICS) technique [15, 16] and the variable headspace technique [17, 18]. Dynamic equilibrium methods include batch air stripping [19–22] and the concurrent flow or the wetted wall column technique [23–25].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of Henry's law constants of thirteen polycyclic aromatic hydrocarbons between 4°C AND 31°C

Bamford

Poster

Baker

1999

Enviro Toxic and Chemistry

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An understanding of the temperature dependence of the Henry's law constant for organic contaminants is critical when modeling the transport and fate of these contaminants in the environment. The Henry's law constants for 13 polycyclic aromatic hydrocarbons (PAHs) were experimentally determined between 4 and 31°C using a gas‐stripping apparatus. The Henry's law constants ranged between 0.02 ± 0.01 Pa m3/mol for chrysene at 4°C and 73.3 ± 20 Pa m3/mol for 2‐methylnaphthalene at 31°C. The temperature dependence of each PAH was modeled using the van't Hoff equation to calculate the enthalpy and entropy of phase change. For nine of the PAHs, the present study reports the first experimental measured temperature dependence of their Henry's law constant. The enthalpies of phase change ranged between 35.4 ± 1.9 kJ/mol for 1‐methylphenanthrene and 100 ± 8 kJ/mol for chrysene. These data can be used to extrapolate Henry's law values within the experimental temperature ranges. For all PAHs except benzo[a]fluorene, the temperature dependence can be predicted within a relative standard error <10%.

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“…The motivation for recent studies stems from the need to quantify the partitioning behavior of chemical species in the environment. For example, some investigations have dealt with the partitioning effect of airstripping toxic compounds, such as gasoline and industrial solvents, from contaminated groundwater (4), and of volatile organic compounds (VOC), such as chlorinated solvents, into room or workplace air from tap water (5). Another environmental application is the partitioning behavior of compounds such as hydrogen peroxide, organic peroxides and hydroperoxides, aldehydes, and lowmolecular-weight carboxylic acids between air and the aqueous phase of cloud, fog, and aerosol droplets in the troposphere (6)(7)(8).…”

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confidence: 99%