• Title/Summary/Keyword: Atmospheric Plasma

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형광 X선에 의한 대기 부유분진중의 미량 성분의 측정 (I): -거름종이 표준시료에 의한 부유분진중 금속성분의 형광 X선 분석-

  • 이용근;맹현재;이보경;황규자
    • Journal of Korean Society for Atmospheric Environment
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    • v.5 no.2
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    • pp.21-29
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    • 1989

  • The metals present in atmospheric particulate come from various sources; natural or anthropogenic. Among various metals Fe, Zn, Pb, Cu, and Mn are of particular concern in as much as they are not only present in large quantity, but toxic to human body. A simple, fast, and non-destructive analytical method for these metals in atmospheric particulate was developed and the analytical details were described herein. The method involves the measurements of X-ray fluorescence of sample contained in filters and comparing it with those for standards. The standard filters were prepared by applicating premeasured standard solution to the filters and then drying. The accuracy of the method was tested by analyzing standard reference materials and by independently analyzing samples using a different, previously accuracy-proven method, inductively coupled plasma atomic emission spectrometry, and comparing the results obtained. Analytical sensitivities and detection limits of the present method were 62.9, 178.2, 82.9, 146.1, 37.2, 120.3 cps/$\mug/cm^2$ and 39.0 35.6, 137.5, 125.9, 182.6, 72.8 $ng/cm^2$ for Fe, Zn, Pb, Cu, Mn, and Ni respectively. The method was applied to Seoul atmospheric particulate and some results were reported.

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Decomposition of odor using atmospheric-pressure plasma (플라즈마를 이용한 악취물질 분해 특성)

  • Kang, Seok-Won;Lee, Jae-Sik;Lee, Kang-San;Lim, Hee-Ah;Kim, Ji-Seong;Lee, Jeong-Dae;Park, Wol-Su;Park, Young-Koo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.7
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    • pp.708-718
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    • 2020

  • Offensive odor is recognized as a social environmental problem due to its olfactory effects. Ammonia(NH3), hydrogen sulfide(H2S) and benzene(C6H6) are produced from various petrochemical plants, public sewage treatment plants, public livestock wastes, and food waste disposal facilities in large quantities. Therefore efficient decomposition of offensive odor is needed. In this study, the removal efficiency of atmospheric-pressure plasma operating at an ambient condition was investigated by evaluating the concentrations at upflow and downflow between the plasma reactor. The decomposition of offensive odor using plasma is based on the mechanism of photochemical oxidation of offensive odor using free radical and ozone(O3) generated when discharging plasma, which enables the decomposition of offensive odor at ordinary temperature and has the advantage of no secondary pollutants. As a result, all three odor substances were completely decontaminated within 1 minute as soon as discharging the plasma up to 500 W. This result confirms that high concentration odors or mixed odor materials can be reduced using atmospheric-pressure plasma.

  • https://doi.org/10.5762/KAIS.2020.21.7.708 인용 PDF KSCI

Enhancement of Nitric Oxide with nonthermal plasma jet and its effect on Escherichia coli inactivation and various type of cancer cell

  • Shaw, Priyanka;Kumar, Naresh;Attri, Pankaj;Choi, Eun Ha
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.230.2-230.2
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    • 2016

  • A new approach for antimicrobial is based on the overproduction of reactive nitrogen species (RNS), especially; nitric oxide (NO) and peroxinitrite ($ONOO^-$-) are important factors to deactivate the bacteria. Recently, non-thermal atmospheric pressure plasma jet (APPJ) has been frequently used in the field of microbial sterilization through the generation of different kinds of RNS/ROS species. However, in previous study we showed APPJ has combine effects ROS/RNS on bacterial sterilization. It is not still clear whether this bacterial killing effect has been done through ROS or RNS. We need to further investigate separate effect of ROS and RNS on bacterial sterilization. Hence, in this work, we have enhanced NO production, especially; by applying a 1% of HNO3 vapour to the N2 based APPJ. In comparison with nitrogen plasma with inclusion of water vapour plasma, it has been shown that nitrogen plasma with inclusion of 1% of HNO3 vapour has higher efficiency in killing the E. coli and different type of cancer cell through the high production of NO. We also investigate the enhancement of NO species both in atmosphere by emission spectrum and inside the solution by ultraviolet absorption spectroscopy. Moreover, qPCR analysis of oxidative stress mRNA shows higher gene expression. It is noted that 1% of HNO3 vapour plasma generates high amount of NO for killing bacteria and cancer cell killing.

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