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다양한 환경요인과 난분해성 유기물에 따른 고온산화 및 UV산화방식 총 유기탄소 산화율 변화
정헌재 ( Heon Jae Jung ),이보미 ( Bo Mi Lee ),이근헌 ( Keun Heon Lee ),신현상 ( Hyun Sang Shin ),허진 ( Jin Hur ) 한국물환경학회 2016 한국물환경학회지 Vol.32 No.1
This study examined the effects of environmental conditions and the presence of refractory organic matter on oxidation rates of total organic carbon (TOC) measurements based on high temperature combustion and ultraviolet-sulfate methods. Spectroscopic indices for prediction of oxidation rates were also explored using the UV spectra and fluorescence excitationemission matrix (EEM) of humic acids. Furthermore, optimum TOC instrument conditions were suggested by comparing oxidation rates of a standard TOC material under various conditions. Environmental conditions included salts, reduced ions, and suspended solids. Salts had the greatest influence on oxidation rates in the UV-sulfate method. However, no effect was detected in the high temperature combustion method. The UV-sulfate method showed lower humic substance oxidation rates, refractory natural organic matter, compared to the other methods. TOC oxidation rates for the UV-sulfate method were negatively correlated with higher specific-UV absorbance, humification index, and humic-like EEM peak intensities, suggesting that these spectroscopic indices could be used to predict TOC oxidation rates. TOC signals from instruments using the UV-sulfate method increased with increasing chamber temperature and increasing UV exposure durations. Signals were more sensitive to the former condition, suggesting that chamber temperature is important for improving the TOC oxidation rates of refractory organic matter.
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장동호,윤준범,이근헌,박경량,Chang, Dong-Ho,Yoon, Jun-Beom,Lee, Keun Heon,Park, Kyeong Ryang 한국미생물학회 2016 미생물학회지 Vol.52 No.1
분변오염의 지표가 되는 장구균을 검출하기 위하여 장구균 선택 배지를 개발하였다. 기존에 알려진 여러 장구균 검출배지 중 총 9종류(Enterococci Confirmatory agar, Azide dextrose agar, Bromocresol-purple azide agar, Esculin bile agar, Citrate azide tween carbonate agar, KF Streptococcus agar, BROLACIN agar, Kanamycin esculin azide agar, Membrane filter Enterococcus selective agar)의 배지를 선별하였고, 배지 성분을 적절히 조합하여 새로운 배지 Enterococcus Mixed medium을 개발하였다. 배지의 효과를 검증하기 위하여 장구균 6종류(Enterococcus avium KACC 10788, Enterococcus faecium KACC 11954, Enterococcus saccharolyticus KACC 10783, Enterococcus durans KACC 10787, Enterococcus faecalis KACC 11304, Enterococcus hirae KACC 10779)와 비장구균 3종류(Escherichia coli KACC 10005, Staphylococcus aureus subsp. aureus KACC 10768, Bacillus subtilis KACC 10111)를 사용하였다. 그 결과 새롭게 개발된 장구균 검출배지에서 비장구균의 생장이 억제된 반면에 장구균 6종류는 모두 생장하는 것을 확인하였다. 또 환경시료에서 장구균을 분리할 수 있는지 확인하기 위해 하천과 바다에서 채취해온 시료를 이용하여 실험한 결과 장구균의 생장을 확인하였다. 따라서 이 배지를 이용하면 수질 분변오염의 지표가 되는 장구균을 효과적으로 검출할 수 있음을 확인하였다. An enterococci selective medium was developed to detect the presence of enterococci for use as a fecal contamination indicator. Among several media which have been known to detect enterococci, the following 9 different kinds of media were selected: Enterococci Confirmatory agar, Azide dextrose agar, Bromocresol-purple azide agar, Esculin bile agar, Citrate azide tween carbonate agar, KF Streptococcus agar, BROLACIN agar, Kanamycin esculin azide agar, and Membrane filter Enterococcus selective agar. Various components from the nine media were mixed to develop a more effective enterococcus selective medium. The newly developed medium named as 'Enterococcus Mixed medium' was more effective than the previous 9 media. Enterococci strains (Enterococcus avium KACC 10788, Enterococcus faecium KACC 11954, Enterococcus saccharolyticus KACC 10783, Enterococcus durans KACC 10787, Enterococcus faecalis KACC 11304, and Enterococcus hirae KACC 10779) and non-enterococci strains (Escherichia coli KACC 10005, Staphylococcus aureus subsp. aureus KACC 10768, and Bacillus subtilis KACC 10111) were used to test the new medium. As a result, the enterococci strains grew well on the Enterococcus Mixed medium whereas the non-enterococci strains did not grow well on it. Additionally, growth of enterococci with freshwater and seawater samples was observed to be good on the Enterococcus Mixed medium. The result of this study confirmed that the Enterococcus Mixed medium was effective in detecting the target enterococci.
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