• Title/Summary/Keyword: 화학종

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Working partial pressure of $CO_2$ gas in aqueous solution

  • Kim Dong-Su
    • Resources Recycling
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    • v.14 no.4 s.66
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    • pp.47-52
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    • 2005

  • Carbonate species in aqueous solution play an important role in the determination of chemical properties of water in relation with alkalinity, buffer capacity, biological productivity, and so on. These compounds also have reactive characteristics such as interphasal reactions between solid, liquid, and gas phases. In the absence of solid materials, the total amount and relative abundance of each carbonate species are directly influenced by the partial pressure of $CO_2$ gas in the atmosphere, which in turn significantly affects the properties of aquatic system. In the water/wastewater treatment process along with the wastes treatment and recycling process which occurring in aquatic environment, it is essential to figure out its characteristics for their optimization and one of its most influential features upon these processes is determined by carbonate species. To understand the fundamental aspect of the relationship between the partial pressure of $CO_2$ gas and chemical features of water, especially pH, the working partial pressure of pure $CO_2$ gas that produced by contacting the dry ice with water has been estimated based on equilibrium calculation. The equilibrium constants for the dissociation ot carbonic acid were determined using van't Hoff equation and the distribution diagram of carbonate species according to the pH has been constructed to substantiate the results of equilibrium calculation. The estimated working partial pressure of pure $CO_2$ gas was found to be a function of the concentration of carbonates in solution, which suggesting that Prior evaluation of the working partial pressure of gas is essential for a better understanding of aquatic interactions.

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Global Modeling of Atmospheric Pressure Oxygen Plasmas (대기압 산소 방전에 관한 공간 평균 모델 시뮬레이션)

  • Hwang, Seok-Won;Lee, Ho-Jun;Lee, Hae-June
    • Journal of the Korean Vacuum Society
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    • v.20 no.4
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    • pp.258-265
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    • 2011

  • A zero-dimensional global model simulator for atmospheric pressure oxygen plasmas has been developed. The simulation model considers the configurations similar to that of plasma needle device. The simulation results show that those species of O, $O_3$, $O_2*$ and ${O_2}^+$ have the highest density in sequence. Electrons dissipate most of their energy through the collisions with oxygen molecules. If the input power increases, the density of most species also increases as much as three-boy collision for the creation of ozone is weakened and hence the density of ozone decreases. The body to volume ratio also affects the plasma density.

  • https://doi.org/10.5757/JKVS.2011.20.4.258 인용 PDF KSCI