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Largiuni, O.; Giacomelli, M.C.; Piccardi, Giovanni

doi:10.1023/a:1013845910688

Cited by 21 publications

(5 citation statements)

References 40 publications

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“…The partial molar enthalpy of sublimation of HCHO is also assumed to be independent of temperature and has been calculated using n S ) 1.245. From eq 9 it appears that ln(P HCHO / X HCHO n S ) is a linear function of inverse temperature whose slope P HCHO (X HCHO , T) ) (X HCHO ) n S A 0 exp ( -∆h sub RT ) (9) Figure 7. Equilibrium solubility of HCHO in ice as a function of the partial pressure of HCHO P HCHO .…”

Section: Kinetics Of Diffusionmentioning

confidence: 99%

“…The major HCHO sink in the atmosphere is its photolysis, which produces HO x radicals, − therefore impacting the oxidative capacity of the atmosphere. Since it is soluble in water, HCHO may be scavenged from the gas phase by rain or fog droplets. − This scavenging has a strong impact on clouds chemistry, for instance, the oxidation of dissolved HCHO in cloudwater droplets by OH radicals is the most important sink for the OH radical in clouds . HCHO is also likely to be efficiently scavenged by ice crystals in the atmosphere or taken up by snow crystals on the ground, because HCHO forms a solid solution with ice. , HCHO can be emitted by the snowpack both from photochemical sources and by the degassing of snow grains supersaturated in HCHO .…”

Section: Introductionmentioning

confidence: 99%

“…Since it is soluble in water, HCHO may be scavenged from the gas phase by rain or fog droplets. [7][8][9][10][11] This scavenging has a strong impact on clouds chemistry, for instance, the oxidation of dissolved HCHO in cloudwater droplets by OH radicals is the most important sink for the OH radical in clouds. 12 HCHO is also likely to be efficiently scavenged by ice crystals in the atmosphere or taken up by snow crystals on the ground, because HCHO forms a solid solution with ice.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamics of the Formaldehyde−Water and Formaldehyde−Ice Systems for Atmospheric Applications

2010

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Formaldehyde (HCHO) is a species involved in numerous key atmospheric chemistry processes that can significantly impact the oxidative capacity of the atmosphere. Since gaseous HCHO is soluble in water, the water droplets of clouds and the ice crystals of snow exchange HCHO with the gas phase and the partitioning of HCHO between the air, water, and ice phases must be known to understand its chemistry. This study proposes thermodynamic formulations for the partitioning of HCHO between the gas phase and the ice and liquid water phases. A reanalysis of existing data on the vapor-liquid equilibrium has shown the inadequacy of the Henry's law formulation, and we instead propose the following equation to predict the mole fraction of HCHO in liquid water at equilibrium, X(HCHO,liq), as a function of the partial pressure P(HCHO) (Pa) and temperature T (K): X(HCHO,liq) = 1.700 × 10(-15) e((8014/T))(P(HCHO))(1.105). Given the paucity of data on the gas-ice equilibrium, the solubility of HCHO and the diffusion coefficient (D(HCHO)) in ice were measured by exposing large single ice crystals to low P(HCHO). Our recommended value for D(HCHO) over the temperature range 243-266 K is D(HCHO) = 6 × 10(-12) cm(2) s(-1). The solubility of HCHO in ice follows the relationship X(HCHO,ice) = 9.898 × 10(-13) e((4072/T))(P(HCHO))(0.803). Extrapolation of these data yields the P(HCHO) versus 1/T phase diagram for the H(2)O-HCHO system. The comparison of our results to existing data on the partitioning of HCHO between the snow and the atmosphere in the high arctic highlights the interplay between thermodynamic equilibrium and kinetics processes in natural systems.

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Section: Kinetics Of Diffusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamics of the Formaldehyde−Water and Formaldehyde−Ice Systems for Atmospheric Applications

2010

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“…7), while without surfactant the linearity range is 0.4-2000 [10]. In fact the working curves usually exhibit a longer linearity range in micelles as compared to that observed in homogeneous solvents ½41 .…”

Section: Dynamic Rangementioning

confidence: 92%

Sensitivity Enhancement of the Formaldehyde Fluorimetric Determination by the use of a Surfactant

Largiuni

Udisti

Piccardi

2002

International Journal of Environmental Analytical Chemistry

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“…The quantification determination of hydrogen peroxide has been carried out by a variety of analytical methods, based on titration 17,18 , spectrophotometry 19,20 , fluorimetric 21,22 , chemiluminescent 23 , spectroscopic 24,25 and electrochemical [26][27][28] measurements. Because of its simplicity and versatility, the latter have been more widely used 28,29 .…”

Section: Introductionmentioning

confidence: 99%

A Fast, Robust Electrochemical Method for the Automated Determination of Hydrogen Peroxide

Mattos

Caroli

Areias³

et al. 2009

J. Chil. Chem. Soc.

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A suitable flow-injection method for the analysis of commercial solutions of hydrogen peroxide is described. A Nafion-coated glassy carbon electrode, modified by deposition of copper hexacyanoferrate (CuCHF), is employed as an amperometric sensor. The method allows the analysis of 45 samples per hour, with peroxide concentrations in the range of 1.25 -10.0 mM, with relative standard deviations smaller than 1%.

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Untitled

Cited by 21 publications

References 40 publications

Thermodynamics of the Formaldehyde−Water and Formaldehyde−Ice Systems for Atmospheric Applications

Thermodynamics of the Formaldehyde−Water and Formaldehyde−Ice Systems for Atmospheric Applications

Sensitivity Enhancement of the Formaldehyde Fluorimetric Determination by the use of a Surfactant

A Fast, Robust Electrochemical Method for the Automated Determination of Hydrogen Peroxide

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