• Title, Summary, Keyword: Nitrogen Dioxide

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A Study of Nitrogen Dioxide Concentration in Industrial Areas (공단지역내 이산화질소농도에 관한 연구)

  • 손부순;김우재;김윤신
    • Journal of environmental and Sanitary engineering
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    • v.16 no.3
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    • pp.42-53
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    • 2001
  • This study were conducted to estimate property of nitrogen dioxide concentration at industrial areas in Korea. The nitrogen dioxide concentrations were measured for 50 dwellings at Ulsan and Yeochon, respectively using the nitrogen dioxide filter badge forming the passive sampler from summer time 1998 to winter time 1999. The major results obtained from this study were as follows: 1. The mean indoor, outdoor, and personal concentrations of nitrogen dioxide during summer time 1998 in Ulsan were 28.9 ppb, 24.8 ppb, 24.8 pub, respectively. 2. The mean indoor, outdoor, and personal concentrations of nitrogen dioxide during winter time 1999 in Yeochon were 11.4 ppb, 12.5 ppb, 15.5 ppb, respectively. 3. The mean concentration of nitrogen dioxide during winter time 1998 were higher than the corresponding levels during summer time 1997 in Ulsan. 4. The mean concentration of nitrogen dioxide in Ulsan were in general higher than the corresponding levels in Yeochon. 5. This results in slightly positive correlation among indoor, outdoor, and personal nitrogen dioxide concentrations for summer time in Ulsan, then it statistical significance is showed(p <.05). These results suggest that nitrogen dioxide concentrations in industrial areas seem to be affected by traffic density and conditions of industrialization.

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Adsorption of Nitrogen Dioxide on Transition-Metal-Oxide-Incorporated Hydrotalcites (전이금속 산화물이 고정된 하이드로탈사이트에 이산화질소 흡착)

  • Park, Ji Won;Seo, Gon
    • Korean Chemical Engineering Research
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    • v.46 no.6
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    • pp.1029-1038
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    • 2008
  • Transition-metal-oxide-incorporated hydrotalcites were prepared by hydrothermal reaction of their synthetic mixtures containing precursors of transition metal oxides and their properties of nitrogen dioxide adsorption was investigated. The dispersion of transition metal oxides on the hydrotalcites and the amount and the state of nitrogen dioxide adsorbed on them were examined by using XRD, SEM, XPS, nitrogen adsorption, a gravimetric adsorption system, FT-IR spectroscopy and temperature programmed desorption techniques. Transition metal oxides were mainly incorporated on their surface and the incorporation of iron and nickel oxides to the hydrotalcites increased their adsorption amounts of nitrogen dioxide. The dispersion of iron oxide on the hydrotalcites was effective in increasing the amount of nitrogen dioxide adsorption, while too much amount of iron oxide incorporation reduced the amount of nitrogen dioxide adsorption due to masking of surface basic sites by agglomerated iron oxide. Although the incorporation of iron oxide to the hydrotalcites lowered the adsorption strength of nitrogen dioxide, the incorporation of it with a proper amount enhanced the amount of nitrogen dioxide adsorption and the stability against the hydrothermal treatment.

Studies on Personal Exposure Level of Nitrogen Dioxide:(In case of housewives living in Seoul) (二酸化窒素의 個人被暴量에 對한 硏究: 서울市內에 居住하는 主婦를 對象으로 한 調査結果)

  • 金旻永;兪榮植;朴相賢;朴聖培
    • Journal of Korean Society for Atmospheric Environment
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    • v.2 no.1
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    • pp.55-72
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    • 1986
  • This study was made to determine the factors involving personal exposure levels of nitrogen dioxide for housewives living in urban area in two seasons, winter and summer. Nitrogen dioxide was measured with a small passive sampler containing triethanolamine. The samplers were set for 24 hours at three points. They were places: on the collar of the housewife to investigate the personal exposure level, near the TV in the living room (indoor level), and near the porch of their house (outdoor level). The subjects recorded the times of cooking using a gas range, using a kitchen ventilator, passive smoking, kerosene heater, total number of minutes at an open window, going out of home, etc.$\ldots. There was an apparent increase in personal exposure level in the case of the unvented heater and also an increase by cooking on a gas range. There was no marked increase in the other situations. There was an increase in the indoor level by cooking on a gas range, only in western style cooking in the winter season. Through these observations, we concluded that personal exposure level of nitrogen dioxide was strongly related to indoor nitrogen dioxide level, and factors involving indoor nitrogen dioxide level seemed different between winter and summer. The most significant difference in nitrogen dioxide level was indoor pollution in the winter and the outdoor environment in the summer. The maximum personal exposure level appeared in the western and tenement house in the winter and the traditional korean house in the summer.

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Effect of Nitrogen and Carbon Dioxide on DME Homogeneous Charge Compression Ignition Engine (DME 예혼합 압축착화 엔진에서 질소와 이산화탄소의 영향)

  • Jang, Jin-Young;Bae, Choong-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.5
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    • pp.171-178
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    • 2008
  • The combustion and exhaust emission characteristics were investigated in an DME fueled HCCI engine. Carbon dioxide, nitrogen and mixed gas, which was composed of carbon dioxide and nitrogen, were used as control parameters of combustion and exhaust emission. As the oxygen concentration in induction air, which was occurred by carbon dioxide, nitrogen and mixed gas, was reduced, the start of auto-ignition was retarded and the burn duration was extended due to obstruction of combustion and reduction of combustion temperature. Due to these fact, indicated mean effective pressure was increased and indicated combustion efficiency was decreased by carbon dioxide, nitrogen and mixed gas. In case of exhaust emission, hydrocarbon and carbon monoxide was increased by reduction of oxygen concentration in induction air. Especially, partial burning was appeared at lower than about 18% of oxygen concentration by supplying carbon dioxide. However it was overcome by intake air heating.

Nitrogen Oxides Adsorbing Capacity of High Carbon Fly Ash Containing Cementitious Materials (탄소함량이 높은 플라이애쉬를 함유한 시멘트 페이스트의 질소산화물 흡착 성능)

  • Lee, Bo Yeon
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.3
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    • pp.37-42
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    • 2018
  • The use of fly ash in construction materials is increasing worldwide due the various advantages of using it, such as to produce durable concrete, or to use less cement and thus lower carbon dioxide emissions. The quality of fly ash is often determined by loss on ignition value (LOI), where an upper limit of LOI is set in each country for quality control purpose. However, due to many reasons, production of high LOI fly ash is increasing that cannot be utilized in concrete, ending up in landfill. In this study, the effect of fly ash use in cementitious materials on nitrogen oxides adsorption is examined. In particular, the effect of using high LOI, and thus high carbon content fly ash on nitrogen oxides adsorption is investigated. The results suggest that the higher carbon content fly ash is related to higher nitrogen dioxide adsorption, although normal fly ash was also more effective in nitrogen dioxide adsorption than ordinary portland cement. Also, higher replacement rate of up to 40% of fly ash is beneficial for nitrogen dioxide adsorption. These results demonstrate that high carbon fly ash can be used as construction materials in an environmentally friendly way where strength requirement is low and where nitrogen oxides emissions are high.

Personal Exposure Level and Health Risk Assessment of Nitrogen Dioxide in an Industrial Area (일부 공단지역 내 이산화질소의 개인노출 농도 및 건강위해성평가)

  • Jeon, Young-Taek;Yang, Won-Ho;Yu, Seung-Do;Lee, Jong-Dae;Son, Bu-Soon
    • Journal of Environmental Health Sciences
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    • v.34 no.3
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    • pp.199-206
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    • 2008
  • This study was conducted to estimate nitrogen dioxide levels and health risk in various locations/situations for two groups. The nitrogen dioxide levels were measured for residents of a study group (industrial area within 5 km) and a control group (15 km farther), respectively using the nitrogen dioxide filter badge as a passive sampler from August, 2006 to September, 2006. The means of indoor, outdoor, work and personal levels of nitrogen dioxide were $34.65{\pm}1.95\;{\mu}g/m^3$, $34.83{\pm}11.78\;{\mu}g/m^3$, $34.98{\pm}19.11$ and $35.38{\pm}10.74$ respectively in the study area. Mean ratio of indoor to outdoor $NO_2$ concentration was 0.99. The means of indoor, outdoor and personal level of nitrogen dioxide were $23.66{\pm}7.19\;{\mu}g/m^3$, $18.22{\pm}4.06\;{\mu}g/m^3$ and $27.27{\pm}18.93\;{\mu}g/m^3$ respectively in the control area. Mean ratio of indoor to outdoor $NO_2$ concentration was 1.39. People spent 80.9% of their time in indoor at the study area and 76.9% at the control area. The percentages of time spent in outdoor were 14.9% and 20.9% at the study area and the control area respectively. The percentages of time spent in a car were 4.2% and 2.2% in the study and control areas respectively. The levels of indoor, outdoor, workplace nitrogen dioxide in the study area and the control area were found below the permissible level of health-hazardous effects.

Characteristics of Concentration Distribution of Coastal Urban Air Pollutants (연안 도시 대기오염 물질의 농도분포 특성)

  • 박종길;석경하;김지형;차주완
    • Journal of Environmental Science International
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    • v.11 no.12
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    • pp.1243-1252
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    • 2002
  • This paper aims to find the characteristics of concentration distribution of coastal urban air pollutants. For this purpose, It was used the daily meteorological data and the hourly concentration data for $O_3$and NO$_2$ in Busan metropolitan city from 1994 to 1996. It was investigated the annual and monthly distribution of ozone and nitrogen dioxide concentration at each site in Busan, and also investigated the characteristics of concentration change of air pollutants with time under the sea breeze. As a results, the concentration of nitrogen dioxide and ozone tend to be increased every year and nitrogen dioxide concentration is higher than ozone concentration at all sites in Busan. The concentration of ozone is high in summer season and low in winter season, but the concentration of nitrogen dioxide have a reversed trend. The monthly peak concentration of ozone occurred in April and September, while the monthly minimum concentration of nitrogen dioxide occurred in August. Their trend were identified by sites near the coastline than sites stands apart from the coastline. The sea breeze occurred annual mean 81 day in Busan from 1994 to 1996. The main wind direction of sea breeze was classified into southwesterly and southeasterly. In case of southwesterly, It was pronounced the south wind and southwest wind. In case of southeasterly, the occurrence frequency of east wind was high. Especially, the concentrations of urban air pollutants, such as ozone and nitrogen dioxide, were high on time which the sea breeze flow, and the areas that ozone concentration was high moved from outside part to central part of city with time. In costal urban such as Busan, the wind direction of sea breeze is influenced the change of ozone and nitrogen dioxide concentration on time which the sea breeze flow at each site and also influenced the change of air pollutants concentration of sites on the pathway of sea breeze.

Influence of Vegetaton Type on the Intensity of Ammonia and Nitrogen Dioxide Liberation from Soil (토양으로부터 휘발되는 암모니아와 이산화질소의 소실에 대한 식피형의 영향에 대하여)

  • 김천민
    • Journal of Plant Biology
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    • v.14 no.3
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    • pp.43-46
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    • 1971
  • Losses of nitrogenin the gaseous form were determined with closed systems in the filed under different vegetation types. Ammonia volatilization was greatest from the pine stand, and least from the sod stand, and was greatly reduced in all three sites in the rainy season due to the low temperature. There were only insignificant differences in the nitrogen dioxide volatilization from the soil of the three vegetation types. Losses of ammonia and nitrogen dioxide at various soil depth also showed little variation. Evidently the microbial activity responsible for the $NO_2$ loss was relatively unaffected by the changes in temperature and soil moisture content during the investigation.

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Acute Pulmonary Edema Caused by Inhalation of Nitrogen Dioxide (이산화질소(Nitrogen Dioxide ; $NO_2$) 흡입에 의한 폐부종 1예)

  • Doh, Sung-Kyoung;Jeong, Hong-Bae;Koh, Young-Min;Yoon, Yoon-Bo;Chung, Yeon-Tae
    • Tuberculosis and Respiratory Diseases
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    • v.44 no.6
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    • pp.1408-1413
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    • 1997
  • A 68 year-old male was admitted with complaint of dyspnea and nonproductive cough which developed 6 hours after accidental inhalation of nitrogen dioxide. On admission, acute pulmonary edema and severe hypoxemia were found. With oxygen and bronchodilator therapy, diffuse alveolar consolitation and his dyspnea were improved from the following day. He was discharged at 8th hospital day with prednisolone 30mg daily for prevention of bronchiolitis obliterans. During 6 weeks of follow up, there was no evidence of bronchiolitis obliterans.

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Conversion of Potassium Chloride to Potassium Nitrate by the Reaction of Nitrogen Dioxide (Potassium Chloride로부터 Nitrogen Dioxide 반응에 의한 Potassium Nitrate로의 전환)

  • Yim, Going
    • The Journal of Natural Sciences
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    • v.8 no.2
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    • pp.129-136
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    • 1996
  • The direct conversion of solid potassium chloride to solid potassium nitrate by the reaction of the chloride with gaseous nitrogen dioxide is suggested for the preparation of potassium nitrate. Thermodynamic calculations indicate that the free energy change is favorable at ordinary temperatures and that the reaction is exothermic. Experiments are described in which it was found that the reaction takes place at ordinary temperatures in the presence of a small amount of water with good yield. Nitrosyl chloride is produced simultaneously.

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