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광주지역 하수처리시설의 TOC 농도 분포와 유기물질간 상관분석 연구
박옥현,민경우,공화진,서재봉,정희윤,정숙경,배석진,조영관 한국수처리학회 2019 한국수처리학회지 Vol.27 No.2
This study, subject to influent and effluent of public sewerage facilities in Gwangju city, is to comprehend the behavior of TOC, analyze the correlations with organic materials. As the influent flows into sewerage facilities, each average concentration was TOC 55.8 mg/L, DOC 34.9 mg/L, BOD 132.4 mg/L, CODMn 62.1mg/L and the item's average concentrations of the effluent was TOC 9.6 mg/L, DOC 6.9 mg/L, BOD 4.8 mg/L, CODMn 9.0mg/L respectively. The concentration of DOC indicated higher than POC from both the influent and effluent; thereby demonstrating the concentration of dissolved organic materials was contributing more to the concentration of TOC. The oxidization rate of C-BOD/TOC 96.3% in influent, 13.3% in effluent showed large deviation with having variation based upon the size of sewerage facilities. Whereas the oxidization rate of CODMn/TCO 42.5% in influent, 36.2% in effluent did not deviate as much, in regards to the size of sewerage facilities. As the correlation coefficient value with TOC, a large-size sewerage facility was BOD 0.657 (p<0.01), CODMn 0.631 (p<0.01), CODCr 0.571 (p<0.01) and a small-size sewerage facility was CODMn 0.765 (p<0.01) in influent. A large-size sewerage facility showed relativity of TOC with CODMn 0.751 (p<0.01) and a small-size sewerage facility indicated a close correlation with BOD 0.921 (p<0.01), CODMn 0.834 (p<0.01), CODCr 0.0.786 (p<0.01) in effluent respectively.
Anisylidenenitromethane의 친핵성 가수분해 반응의 반응기구
박옥현,임미재 梨花女子大學校 韓國生活科學硏究院 1973 韓國生活科學硏究院 論叢 Vol.11 No.-
Anisylidenenitromethane (ANM)의 친핵성 가수분해 반응의 반응속도 상수를 여러 pH에서 구하였고 이 반응메카니즘에 잘 적용되는 전체 반응속도식을 구하였다. 이 반응속도식에서 산성쪽 반응메카니즘과 염기성쪽 반응메카니즘이 서로 다르다는 것을 알았다. 즉 산성쪽의 가수분해반응은 ANM에 물분자가 먼저 첨가됨으로서 반응이 시작되나 염기성쪽에서는 hydroxide ion의 첨가에 의하여 반응이 시작된다. 그러나 Mechael 반응에 따르지 않고 복잡하다. 왜냐하면 ANM이 강염기용매에서는 약산으로 작용하여 해리가 이루어지기 때문이다. 따라서 acid dissociation constant (K_a)로 고려해야 하므로 pH 11 이상에서는 rate contant가 일정함을 볼 수 있다. The rate-constants of the nucleophilic hydrolysis of anisylidenenitromethane (ANM) were determined at various pH and a rate-equation that could be well applied to the all range of pH were also obtained. This rate-equation shows that the mechanism of the reaction in acidic media is different from that in basic media: The reaction of hydrolysis in acid media is started by addition of water molecule, but that in basic media is started by addition of hydroxyl ion. However it is not involved in Michael reaction, because ANM in strong basic media behaves as weak acid and acid dissociation costant (Ka) of ANM should be considered at the rate-equation. Here the rate constants keep the same when above pH 11 it is.
박옥현,김환기,송근일,김소영,조은,안상수,김민진,송형명,김종민 한국생활환경학회 2022 한국생활환경학회지 Vol.29 No.2
This research was conducted to quantify hazardous substances in indoor air from various public facilities with sensitive populations, including daycare centers, medical institutions, and elderly care facilities from March 2021 to October 2021, located in Gwangju city, South Korea. Measured air pollutants include: PM10, PM2.5, CO2, CO, total airborne bacteria(TAB), 43 different volatile organic compounds(VOCs), and 7 different aldehydes. The measured air pollutants were found in the following average concentrations 18.3 μg/m3 of PM10, 11.7 μg/m3 of PM2.5, 596 ppm of CO2, 18.7 μg/m3 of formaldehyde, 0.9 ppm of CO, and 212 CFU/m3 of TAB. The average VOCs concentrations of toluene, m,p-xylene, ethylbenzene, styrene, o-xylene were 37.8 μg/m3, 12.7 μg/m3, 10.0 μg/m3, 4.9 μg/m3, 4.7 μg/m3, respectively. d-limonene, 1-butanol, octane, heptane, butyl acetate, and hexane were also detected. The average total volatile organic compounds(TVOCs) concentration was found to be 293.8 μg/m3 for daycare centers, 357.4 μg/m3 for medical institutions and 262.9 μg/m3 for elderly care facilities. For aldehydes, formaldehyde and acetaldehyde concentrations were 18.7 μg/m3 and 12.4 μg/m3, respectively.