Henry's law and hydrolysis-rate constants for peroxyacyl nitrates (PANs) using a homogeneous gas-phase source

1995 ◽  
Vol 21 (2) ◽  
pp. 151-164 ◽  
Author(s):  
Jost Kames ◽  
Ulrich Schurath
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Hydrolysis Rate ◽  
Henry's Law ◽  
Henry’S Law ◽  
Peroxyacyl Nitrates

Henry's law constants and hydrolysis rate constants of 2,2,2-trifluoroethyl acetate and methyl trifluoroacetate

2004 ◽  
Vol 38 (5) ◽  
pp. 725-732 ◽  
Author(s):  
Shuzo Kutsuna ◽  
Liang Chen ◽  
Kayo Ohno ◽  
Kazuaki Tokuhashi ◽  
Akira Sekiya
Keyword(s):  
Rate Constants ◽  
Hydrolysis Rate ◽  
Henry's Law ◽  
Henry’S Law ◽  
Henry’S Law Constants ◽  
Henry's Law Constants

scholarly journals Partitioning of hydrogen peroxide in gas-liquid and gas-aerosol phases

2020 ◽  
Vol 20 (9) ◽  
pp. 5513-5526 ◽  
Author(s):  
Xiaoning Xuan ◽  
Zhongming Chen ◽  
Yiwei Gong ◽  
Hengqing Shen ◽  
Shiyi Chen
Keyword(s):  
Hydrogen Peroxide ◽  
Gas Phase ◽  
Pure Water ◽  
Average Concentration ◽  
Urban Atmosphere ◽  
Hydrolysis Rate ◽  
Ambient Atmosphere ◽  
Organic Peroxides ◽  
Henry's Law ◽  
Henry’S Law

Abstract. Hydrogen peroxide (H2O2) is a vital oxidant in the atmosphere and plays critical roles in the oxidation chemistry of both liquid and aerosol phases. The partitioning of H2O2 between the gas and liquid phases, or the aerosol phase, could affect its abundance in these condensed phases and eventually the formation of secondary components. However, the partitioning processes of H2O2 in gas-liquid and gas-aerosol phases are still unclear, especially in the ambient atmosphere. In this study, field observations of gas-, liquid-, and aerosol-phase H2O2 were carried out in the urban atmosphere of Beijing during the summer and winter of 2018. The effective field-derived mean value of Henry's law constant (HAm, 2.1×105 M atm−1) was 2.5 times of the theoretical value in pure water (HAt, 8.4×104 M atm−1) at 298±2 K. The effective derived gas-aerosol partitioning coefficient (KPm, 3.8×10-3 m3 µg−1) was 4 orders of magnitude higher on average than the theoretical value (KPt, 2.8×10-7 m3 µg−1) at 270±4 K. Beyond following Henry's law or Pankow's absorptive partitioning theory, the partitioning of H2O2 in the gas-liquid and gas-aerosol phases in the ambient atmosphere was also influenced by certain physical and chemical reactions. The average concentration of liquid-phase H2O2 in rainwater during summer was 44.12±26.49 µM. In 69 % of the collected rain samples, the measured level of H2O2 was greater than the predicted value in pure water calculated by Henry's law. In these samples, 41 % of the measured H2O2 was from gas-phase partitioning, while most of the rest may be from residual H2O2 in raindrops. In winter, the level of aerosol-phase H2O2 was 0.093±0.085 ng µg−1, which was much higher than the predicted value based on Pankow's absorptive partitioning theory. The contribution of partitioning of the gas-phase H2O2 to the aerosol-phase H2O2 formation was negligible. The decomposition/hydrolysis rate of aerosol-phase organic peroxides could account for 11 %–74 % of the consumption rate of aerosol-phase H2O2, and the value depended on the composition of organic peroxides in the aerosol particles. Furthermore, the heterogeneous uptake of HO2 and H2O2 on aerosols contributed to 22 % and 2 % of the aerosol-phase H2O2 consumption, respectively.

scholarly journals Compilation of Henry's law constants (version 4.0) for water as solvent

2015 ◽  
Vol 15 (8) ◽  
pp. 4399-4981 ◽  
Author(s):  
R. Sander
Keyword(s):  
Gas Phase ◽  
Environmental Chemistry ◽  
Dilute Solution ◽  
Henry's Law ◽  
Cloud Droplets ◽  
Henry’S Law ◽  
Water As Solvent ◽  
Equilibrium Ratio ◽  
Henry’S Law Constants ◽  
Henry's Law Constants

Abstract. Many atmospheric chemicals occur in the gas phase as well as in liquid cloud droplets and aerosol particles. Therefore, it is necessary to understand the distribution between the phases. According to Henry's law, the equilibrium ratio between the abundances in the gas phase and in the aqueous phase is constant for a dilute solution. Henry's law constants of trace gases of potential importance in environmental chemistry have been collected and converted into a uniform format. The compilation contains 17 350 values of Henry's law constants for 4632 species, collected from 689 references. It is also available at http://www.henrys-law.org.

scholarly journals Partitioning of hydrogen peroxide in gas-liquid and gas-aerosol phases

2020 ◽  
Author(s):  
Xiaoning Xuan ◽  
Zhongming Chen ◽  
Yiwei Gong ◽  
Hengqing Shen ◽  
Shiyi Chen
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Gas Phase ◽  
Pure Water ◽  
Average Concentration ◽  
Effective Field ◽  
Urban Atmosphere ◽  
Ambient Atmosphere ◽  
Henry's Law ◽  
Henry’S Law

Abstract. Hydrogen peroxide (H2O2) is a vital oxidant in the atmosphere and plays critical roles in the oxidation chemistry of both liquid and aerosol phases. The partitioning of H2O2 between the gas and liquid phase or the aerosol phase could affect its abundance in these condensed phases and eventually the formation of secondary components. However, the partitioning processes of H2O2 in gas-liquid and gas-aerosol phases are still unclear, especially in the ambient atmosphere. In this study, field observations of gas-, liquid-, and aerosol-phase H2O2 were carried out in the urban atmosphere of Beijing during the summer and winter of 2018. The effective field-derived mean value of Henry's law constant (HAm, 2.1 × 105 M atm−1) was 2.5 times that of the theoretical value in pure water (HAt, 8.4 × 104 M atm−1) at 298 ± 2 K. The effective derived gas-aerosol partitioning coefficient (KPm, 3.8 × 10−3 m3 μg−1) was four orders of magnitude higher on average than the theoretical value (KPt, 2.8 × 10−7 M atm−1) at 270 ± 4 K. The partitioning of H2O2 in the gas-liquid and gas-aerosol phases in the ambient atmosphere does not only obey Henry's law or Pankow's absorptive partitioning theory but is also influenced by certain physical and chemical reactions. The average concentration of liquid-phase H2O2 in rainwater during summer was 44.12 ± 26.49 μM. In three-quarters of the collected rain samples, the measured H2O2 was greater than the predicted value in pure water calculated by Henry's law. In these samples, 46 % of the measured H2O2 was from gas-phase partitioning, and most of the rest may have come from residual H2O2 in raindrops. In winter, the level of aerosol-phase H2O2 was 0.093 ± 0.085 ng μg−1, which was much higher than the predicted value based on Pankow's absorptive partitioning theory. Almost all aerosol-phase H2O2 was not from the partitioning of the gas phase. The decomposition/hydrolysis of aerosol-phase organic peroxides could be responsible for 32 % of aerosol-phase H2O2 formation at the maximum rate of 3.65 ng μg−1. Furthermore, the heterogeneous uptake of H2O2 on aerosols contributed to less than 0.5 %.

scholarly journals Compilation of Henry's law constants, version 3.99

2014 ◽  
Vol 14 (21) ◽  
pp. 29615-30521 ◽  
Author(s):  
R. Sander
Keyword(s):  
Gas Phase ◽  
Environmental Chemistry ◽  
Aerosol Particles ◽  
Dilute Solution ◽  
Henry's Law ◽  
Cloud Droplets ◽  
Henry’S Law ◽  
Equilibrium Ratio ◽  
Henry’S Law Constants ◽  
Henry's Law Constants

Abstract. Many atmospheric chemicals occur in the gas phase as well as in liquid cloud droplets and aerosol particles. Therefore, it is necessary to understand the distribution between the phases. According to Henry's law, the equilibrium ratio between the abundances in the gas phase and in the aqueous phase is constant for a dilute solution. Henry's law constants of trace gases of potential importance in environmental chemistry have been collected and converted into a uniform format. The compilation contains 14775 values of Henry's law constants for 3214 species, collected from 639 references. It is also available on the internet at http://www.henrys-law.org.

scholarly journals Distribution of ammonia, mono-, di- and triethylamine in the water solution–gas phase system.

2019 ◽  
Vol 63 (2) ◽  
pp. 164-168 ◽  
Author(s):  
E. G. Kosandrovich ◽  
L. N. Shachenkova ◽  
V. S. Soldatov
Keyword(s):  
Gas Phase ◽  
Equilibrium Distribution ◽  
Ionization Constant ◽  
Water Solution ◽  
Phase System ◽  
Henry's Law ◽  
Equilibrium Conditions ◽  
Henry’S Law ◽  
Henry's Constants ◽  
Solution Gas

The equilibrium distribution of ammonia, ethylamine, diethylamine and triethylamine between their aqueous solutions and the gas phase at 25 ± 0.1 °C have been investigated under equilibrium conditions. Based on the results obtained (using the equations of Henry’s law and the ionization constant), Henry’s constants for these substances have been calculated with the consideration of their interaction with water. It was established that Henry’s law is valid, at least, in the range of amine concentrations in the air 0–200 mg/m3.

scholarly journals Henry’s law constants (IUPAC Recommendations 2021)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rolf Sander ◽  
William E. Acree ◽  
Alex De Visscher ◽  
Stephen E. Schwartz ◽  
Timothy J. Wallington
Keyword(s):  
Gas Phase ◽  
Infinite Dilution ◽  
Henry's Law ◽  
Important Distinction ◽  
Henry’S Law Constant ◽  
Proportionality Coefficient ◽  
Henry’S Law ◽  
Solubility Constant ◽  
Henry’S Law Constants ◽  
Henry's Law Constants

Abstract Henry’s law states that the abundance of a volatile solute dissolved in a liquid is proportional to its abundance in the gas phase. It applies at equilibrium and in the limit of infinite dilution of the solute. For historical reasons, numerous different definitions, names, and symbols are used in the literature to express the proportionality coefficient, denoted the “Henry’s law constant”. Here, a consistent set of recommendations is presented. An important distinction is made between two new recommended reciprocal quantities: “Henry’s law solubility constant” (H s) and “Henry’s law volatility constant” (H v). Eight recommended variants of H s and H v are described and relations among them presented.

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