• Title, Summary, Keyword: Carbon Monoxide

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RISK EVALUATION OF CARBON MONOXIDE IN COMPARTMENT FIRE

  • Kim, Kwang Il
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.66-76
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    • 1997
  • In order to investigate the generation of carbon monoxide and heat loss of incomplete combustion in compartment fires, an experiment was conducted in a small scale compartment by using methanol as a fuel. The concentration of carbon monoxide and the toxicity parameter showed high values when the mass air - to - fuel stoichiometric ratio is under 1.0. The constitution of the combustion gas was showed to estimate it from the . The heat loss due to incompleteness of combustion is about one third of heat of combustion in case of under 1.0.

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Synthesis of Diaryl $\alpha$-Diketones via Palladium Catalyzed Double Carbonylative Homo Coupling of Aryl Iodides with Carbon Monoxide

  • Kim Jin Il;Kim Nam Jung;Ryu Cheol Mo
    • Bulletin of the Korean Chemical Society
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    • v.9 no.1
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    • pp.30-32
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    • 1988
  • Symmetrical diaryl ${\alpha}-diketones$ were synthesized in moderately good yields through the palladium catalyzed reaction of aryl iodides with carbon monoxide. The reaction was tolerant of a wide variety of fuctionalities($OCH_3,\;CH_3,\;NO_2,\;OH,\;COOH$) on the aryl iodide. On the other hand, the similar reaction of aryl bromides or chlorides with carbon monoxide did not proceed.

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A Study on the Determination of Carbon monoxide in the Blood by Spectrophotometry (분광광도법에 의한 혈중일산화탄소의 측정에 관한 연구)

  • 정근호
    • Journal of Environmental Health Sciences
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    • v.2 no.1
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    • pp.49-51
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    • 1975
  • The accidents, homicides and suicides of carbon monoxide poisoning to increase in number every year are required precize, accurate, and rapid method for the determination of carbon monoxide in the blood samples. Here is the basis of this method for the determination of percentage saturation of hemoglobin by carbon monoxide which have found out to be suitable in laboratory as follows: A 0.1ml of blood is mixed with 20ml of 0.1% ammonium hydroxide, and 20mg sodium hydrosulfite is added to convert oxyhemoglobin to reduction hemoglobin. The absorbance is measured at 538nm and 578nm, the measurement was carried out within ten minutes of addition of sodium hydrosulfate.

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A Study on Carbon monoxide Gas Sensing Characteristics of Pt-SiC Schottky Diode Schottky Diode (Pt-SiC 쇼트키 다이오드를 이용한 CO Gas 감지 특성에 대한 연구)

  • Nho, I.H.;Lee, J.H.;Yang, S.J.;Jang, S.W.;Kim, C.K.
    • Proceedings of the KIEE Conference
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    • pp.90-92
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    • 2001
  • Carbon monoxide-sensing behavior of Pt-SiC Schottky diodes. fabricated on the same SiC substrate have been systematically compared and analyzed as a function of carbon monoxide concentrati on and temperature by I-V and ${\Delta}I$-t methods under steady-state and transient condition. Adsorption activation energies of Carbon monoxide on the surface of Pt-SiC Schottky diodes is investigated in a high temperature range ($100{\sim}500^{\circ}C$). The optimal temperature for behavior sensing is $300^{\circ}C$ and saturation concentration is 200 ppm.

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Histochemical studies on effect of low concentrated carbon monoxide on the caudate nucleus in rat (저농도 일산화탄소가 흰쥐 미상핵에 미치는 영향에 관한 조직화학적 연구)

  • Kim, Jin-sang
    • Korean Journal of Veterinary Research
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    • v.29 no.4
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    • pp.425-431
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    • 1989
  • This study was undertaken to investigate the changes of enzyme activities resulted from low concentrated carbon monoxide poisoning on the caudate nucleus in rat. The activities of cytochrome oxidase, succinate dehydrogenase and lactate dehydragenase were observed histochemically, after the experimental animals were poisoned to 100ppm carbon monoxide for 8 hours every day from one day to 16 days. The materials were sliced from coronal section at the level of the optic chiasm and immediately frozen sections of $10{\mu}m$ thickness were cut on the cryostat at $-15^{\circ}C$ and incubated in the medium containing substrate for histochemical detection of cytochrome oxidase, succinate dehydrogenase and lactate dehydrogenase. The sections were mounted in glycerol gelatin and observed under light microscope. It was obtained that cytochrome oxidase activity decreased moderately and succinate dehydrogenase activity showed marked or moderate activity during entire poisoning period and lactate dehydrogenase activity showed marked or moderate activity from one to 8 days but recovered to normal condition at 16th day.

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Effect of Ginseng Saponins on the Amount of Catecholamine Neurotransmitters in Carbon Monoxide-intoxicated Rats and Aged Rats (인삼 사포닌이 일산화탄소중독 및 노화과정에서 흰쥐의 신경전달물질 함량 변화에 미치는 영향)

  • Park, Hea-Young;Kim, Choon-Mi;Ju, Ji-Yeon;Choi, Hyun-Jin
    • YAKHAK HOEJI
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    • v.36 no.3
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    • pp.285-290
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    • 1992
  • After rats were exposed to 5,000 ppm carbon monoxide for 30 minutes, the amounts of catecholamine neurotransmitters in stratum were measured using high performance liquid chromatograph equipped with electrochemical detector. The concentration of dopamine in stratum was significantly decreased after carbon monoxide intoxification, but those of dihydroxyphenylacetic acid, norepinephrine, and epinephrine was not changed. However the pretreatments of Ginseng total saponin and panaxatriol saponin increased the concentrations of dopamine and its acidic metabolites (DOPAC and HVA). Ginseng total saponin also increased the concentrations of norepinephrine and epinephrine. Similar results were obtained from aged rats.

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Purification and Characterization of an Intracellular Protease form Pseudomonas carboxydovorans DSM 1227 Grown on Carbon Monoxide

  • Ho, Bae-Ki;Kim, Young-Min
    • Korean Journal of Microbiology
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    • v.30 no.4
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    • pp.299-304
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    • 1992
  • An intracellular protease form cells of Pseudomonas carboxydovorans DSM 1227 grown on carbon monoxide was purified 57-fold in six steps to homogeneity with a yield of 4.3% using azocoll as a substrate. The molecular weight of the enzyme was determined to be 150,000. Sodium dodecyl sulfate-gel electrophoresis revealed the purified enzyme to be a dimer with two identical subunits of molecular weight 72,000. The enzyme was stimulated by $Mg^{2+}$ but was inhibited completely by $Cd^{2+}$ $Fe^{2+}$ $Hg^{2+}$, and $^Zn{2+}$ The enzyme activity was also inhibited by EDTA, EGTA, phenylmethylsulfonyl fluoride, and phenyl glyoxal, but was increased by 1-ethyl-3(dimethyl aminopropyl fluoride, and phenyl glyoxal, but was increased by 1-ethyl-3(dimethyl aminopropyl)carbodiimide, iodoacetamide and dithiothereitol. The optimal pH and temperature for the enzyme reaction were found to be 7-8 and 50.deg.C, respectively. Casein and bovine serum albumin were hydrolyzed by the enzyme, but carbon monoxide dehydrogenase was not.

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Catalytic Activity of $Nd_{1-x}Sr_xCoO_{3-y}$ on the Oxidation of Carbon Monoxide

  • Kim, Keu-Hong;Kim, Seong-Han;Lee, Dong-Hoon;Kim, Yoo-Young;Choi, Jae-Shi
    • Bulletin of the Korean Chemical Society
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    • v.12 no.1
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    • pp.35-39
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    • 1991
  • The catalytic activity of $Nd_{1-x}Sr_xCoO_{3-y}$, $0{\leq}x{\leq}0.75$ and $0.001{\leq}y{\leq}0.103$, on the oxidation of carbon monoxide has been investigated from the structure analyses of the catalysts by X-ray diffraction and infrared spectroscopy and the measurements of the oxidation and adsorption rates of carbon monoxide. The catalytic activity is found to be correlated with Sr substitution (x) and nonstoichiometry (y). The oxidation power of carbon monoxide increases continuously with increasing Sr substitution without oxygen, but increases with Sr substitution up to x = 0.25 and then is almost constant at larger x values up to x = 0.75 with oxygen. This change of catalytic activity is explained by the oxidation-reduction properties of the catalyst due to the variation of nonstoichiometry.

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Barrier Height from Ⅴ-Ⅰ Characteristics of Semiconductor Contact: Reaction of Absorbed Oxygen with Carbon Monoxide on ZnO (1010)

  • 김혜정;한종수
    • Bulletin of the Korean Chemical Society
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    • v.18 no.2
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    • pp.149-151
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    • 1997
  • Barrier height on the surface was monitored at 77 K by observing the inflection of V-I characteristics of ZnO(1010)-ZnO(1010) contact in the surface reaction of oxygen species with carbon monoxide. The contact showed inflections at 10-20 mV and 10-50 mV for the sample adsorbed oxygen at 298 K and 573 K, respectively. When the sample adsorbed oxygen at 573 K was exposed to carbon monoxide at 298 K and 573 K, inflections were observed at 10-40 mV and 10-30 mV, respectively. The results indicated that the adsorption of oxygen on ZnO increased the surface barrier height, and the reaction of carbon monoxide with the oxygen-preadsorbed (at 573 K) ZnO decreased the surface barrier height.

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Analysis of Mechanism for Diffusion of Incomplete Combustion Gas Released from Domestic Gas Boiler (가정용 보일러의 불완전연소가스 누출확산 메커니즘 해석)

  • Kang, Seung-Kyu;Choi, Kyung-Suhk;Yoon, Joon-Yong
    • Proceedings of the KSME Conference
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    • pp.2868-2873
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    • 2008
  • Carbon Monoxide(CO) poisoning accident is higher than any other gas accident in the rate of deaths/incidents. In the last five years, 36 people died and 104 were wounded because of carbon monoxide poisoning accident. Most of these CO poisoning accidents were caused by defective exhaust tube in the old gas boiler and multi-use facility. In this study, the spread of incomplete combustion gas(CO) released from leakage hole of exhaust tube was analyzed by computational flow modeling and concentration measuring test. CO gas leaked form exhaust tube in a building was highest concentrated near the ceiling and formed the circular currents along the walls. Through these experiments and simulation, the reasonable installation location of carbon monoxide alarm was made certain and suggested.

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