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서울 대기 중 미세먼지 내 n-alkanes의 계절별 농도 및 배출 특성
이세표 ( Se Pyo Lee ),임형배 ( Hyung Bae Lim ),이지이 ( Ji Yi Lee ),김용표 ( Young Pyo Kim ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.2
Ambient particulate n-alkanes were analyzed for PM10 samples collected in Seoul from April 2010 to April 2011. The average concentration of total n-alkanes from C20 to C34 was 53.68±35.02 ng/m3, ranging from 10.36 to 166.1 ng/m3. The concentration distributions of n-alkane compounds in this study exhibited peaks at C29 during the whole sampling period, which indicated that n-alkanes of biogenic origin such as plant wax predominated in the PM10 in Seoul. The average carbon preference index (CPI) value was 1.95±0.54 in the range of 0.82-6.02. The decrease of the CPI during the heating period indicated the contribution of fossil fuel combustion. Estimation of sources based on the WNA% calculation showed that 32.2±15.0% of the n-alkanes in PM10 in Seoul during the non-heating period originated from plant wax. The source estimation was performed using the principal component analysis method. Three major components were found to account for 38.2%, 33.4% and 19.0% of the total variance, which corresponded to plant wax, vehicular emissions and fossil fuels for heating, respectively.
박철하,이세표,차병진 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2
To minimize the trial and error by farmers who have no other choice but to use antibiotics for human-disease control, because no agricultural tetracycline for jujube witches-broom disease is available at this point. therapeutical efficacy of several commercial antibiotics against the disease through trunk injection was evaluated. The efficacy of human tetracyclines in trunk injection of jujube tree for witches-broom therapy varied to some extnet. Tetracyclines for intravenous or subepidermal injection showed the strongest symptom-suppression effect. Those, however, were not practical because of high price. On the other hand, tetracyclines in capsule were much cheaper than the former and can be used practically. For trunk injection, just the powder in capsule should be dissolved in clean water and then filtered through cheese cloth or tissue papaer to remove the sediments unnecessary for trees. Otherwise, the sediment would clog the injection hole and the feeder tube. In this experiment. tetracycline HCl of Glaxo made the least sediment in the solution. In addition, the plastic bottle to contain Korean wine was much cheaper and more practical than the commercial one for tree injection.