Dataset Information

Corona Discharge and Field Electron Emission in Ambient Air Using a Sharp Metal Needle: Formation and Reactivity of CO₃ ^-• and O₂ ^-•.

ABSTRACT: CO₃ ^-• and O₂ ^-• are known to be strong oxidizing reagents in biological systems. CO₃ ^-• in particular can cause serious damage to DNA and proteins by H^• abstraction reactions. However, H^• abstraction of CO₃ ^-• in the gas phase has not yet been reported. In this work we report on gas-phase ion/molecule reactions of CO₃ ^-• and O₂ ^-• with various molecules. CO₃ ^-• was generated by the corona discharge of an O₂ reagent gas using a cylindrical tube ion source. O₂ ^-• was generated by the application of a 15 kHz high frequency voltage to a sharp needle in ambient air at the threshold voltage for the appearance of an ion signal. In the reactions of CO₃ ^-•, a decrease in signal intensities of CO₃ ^-• accompanied by the simultaneous increase of that of HCO₃ ^- was observed when organic compounds with H-C bond energies lower than ∼100 kcal mol^-1 such as n-hexane, cyclohexane, methanol, ethanol, 1-propanol, 2-propanol, and toluene were introduced into the ion source. This clearly indicates the occurrence of H^• abstraction. O₂ ^-• abstracts H⁺ from acid molecules such as formic, acetic, trifluoroacetic, nitric and amino acids. Gas-phase CO₃ ^-• may play a role as a strong oxidizing reagent as it does in the condensed phase. The major discharge product CO₃ ^-• in addition to O₂ ^-•, O₃, and NO _x ^• that are formed in ambient air may cause damage to biological systems.

SUBMITTER: Hiraoka K

PROVIDER: S-EPMC8697365 | biostudies-literature |

REPOSITORIES: biostudies-literature

ACCESS DATA

Similar Datasets

Project description:Rapid urbanization and consuming lifestyles have intensified air pollution in urban areas. Air pollution in megacities has imposed severe environmental damages to human health. Proper management of the issue necessitates identification of the share of emission sources. Therefore, numerous research works have studied the apportionment of the total emissions and observed concentrations among different emissions sources. In this research, a comprehensive review is conducted to compare the source apportioning results for ambient air PM2.5 in the megacity of Tehran, the capital of Iran. One hundred seventy-seven pieces of scientific literatures, published between 2005 and 2021, were reviewed. The reviewed research are categorized according to the source apportioning methods: emission inventory (EI), source apportionment (SA), and sensitivity analysis of the concentration to the emission sources (SNA). The possible reasons for inconsistency among the results are discussed according to the scope of the studies and the implemented methods. Although 85% of the reviewed original estimates identify that mobile sources contribute to more thant 60% of Tehran air pollution, the distribution of vehicle types and modes are clearly inconsistent among the EI studies. Our review suggests that consistent results in the SA studies in different locations in central Tehran may indicate the reliability of this method for the identification of the type and share of the emission sources. In contrast, differences among the geographical and sectoral coverage of the EI studies and the disparities among the emission factors and activity data have caused significant deviations among the reviewed EI studies. Also, it is shown that the results of the SNA studies are highly dependent on the categorization type, model capabilities and EI presumptions and data input to the pollutant dispersion modelings. As a result, integrated source apportioning in which the three methods complement each other's results is necessary for consistent air pollution management in megacities.Supplementary informationThe online version contains supplementary material available at 10.1007/s40201-023-00855-0.

Dataset Information

Corona Discharge and Field Electron Emission in Ambient Air Using a Sharp Metal Needle: Formation and Reactivity of CO₃ ^-• and O₂ ^-•.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Dataset Information

Corona Discharge and Field Electron Emission in Ambient Air Using a Sharp Metal Needle: Formation and Reactivity of CO3 -• and O2 -•.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Corona Discharge and Field Electron Emission in Ambient Air Using a Sharp Metal Needle: Formation and Reactivity of CO₃ ^-• and O₂ ^-•.