간행물
한국냄새환경학회지 KCI 등재 Journal of Korean Society of Odor Research and Engineering
- 발행기관 한국냄새환경학회
- 자료유형 학술지
- 간기 계간
- ISSN 1598-6616 (Print)2287-6731 (Online)
- 수록기간 2002 ~ 2013
- 주제분류 공학 > 환경공학 공학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제12권 제1호 (2013년 3월) 4건
1.
2013.03
구독 인증기관 무료, 개인회원 유료
In this study, the experimental feasibility of alkali absorption method, recommended for the analysis of volatile fatty acids (VFA), was evaluated by considering the vaporization efficiency in relation to Henry’s law. Many experimental steps involved in the analysis such as absorption of VFA into the solution (as sorbent), extraction of absorbed VFA from solution, and SPME analysis of extracted vapor are all prone to biases. The extent of bias involved in the extraction stage is estimated under the simulated conditions of active purging at two temperature conditions of 25 and 90℃. The results of computation based on this simulated condition indicated that recovery rate of VFA from absorbed solution can be 1.1% and 30.2% after 1 hour of purging, respectively. As this low recovery rate is directly associated with low sensitivity and poor reproducibility, this official testing method is prone to various sources of experimental biases. Because of these limitations involved in VFA analysis, this official method cannot be used reliably to quantify the VFA in ambient air samples. Consequently, it is desirable to replace this method with the other verified method with more confidence such as the combined application of sorbent tube and thermal desorption.
4,000원
2.
2013.03
구독 인증기관 무료, 개인회원 유료
This study aims to evaluate the relationship with the concentration and odor intensity using the odor sensory method for 5 types of aldehyde compounds and styrene. For the measurement, 13 panelists were selected by several criteria through a panel test. The estimation showed that the correlation of the concentration with odor intensity for the 12 compounds including of the sulfur compounds, ammonia, and trimethylamine can be reasonably expressed by the equation I = Aㆍlog C + B (I : odor Intensity, C : material concentration, A : material constant, B : constant). The equations show the sensivities of intensity change for the change of concentration. According to the increase of concentration the odor intensities for acetaldehyde and iso-valeraldehyde increase larger than for the other aldehydes. Regulation standards of 12 species of odor substance concentraton and odor intensity by using the correlation equation was reviewed for adequacy. It was evaluated that the regulation standards on site boundary in operation are too low for NH₃, DMDS, and iso-valeraldehyde and too high for TMA. The result of this study is suggested to be used as a base data for research on measures to improve the regulation standards for complex odor concentration on site boundary in operation.
4,000원
3.
2013.03
구독 인증기관 무료, 개인회원 유료
In this study, the detection characteristics of volatile organic compounds (VOCs) were investigated in relation to two different experimental approaches (direct injection (DI) vs. solid phase micro extraction (SPME)) based on effective carbon number (ECN) theory. To this end, the calibration data obtained by both methods were evaluated in association with split ratio (such as 1:1 (splitless), 1:5, 1:10, and 1:20) The calibration results of eight different target VOCs were examined in terms of relative sensitivity at a given split ratio. If slope values are derived between ECN and Response Factor (RF) values of each compound, the DI-based data obtained at 1:5 split ratio yielded slightly positive bias of +3.6% relative to theoretic values of 20%. Likewise, the results at 1:10 split condition showed +1.2% bias. In contrast, the SPME-based results showed significantly large biases. The result of this comparative study suggests the need for more deliberate QA procedure to obtain quantitative data for the SPME method.
4,000원
4.
2013.03
구독 인증기관 무료, 개인회원 유료
An objectives of this study is to investigate indoor concentrations of 22 odorous compounds, which are regulated by the domestic act, emitted from pig buildings through on-site visit per month from July, 2011 to June, 2012. Of 22 odorous compounds, the highest concentration was found in ammonia with ppm unit, followed by hydrogen sulfide, methyl ethyl ketone, propionic acid and butylic acid with ppb unit of approximate hundred level. The other odorous compounds were detected below ppb unit of approximate ten level. A remarkable finding is that there is no pig building which showed the airborne levels of five aldehyde-based odorous compounds (acetaldehyde, propionaldehyde, butyraldehyde, n-valeraldehyde and i-valeraldehyde). In general, indoor concentrations of odorous compounds in pig buildings were higher in scraper type than slurry type based on pig manure collection system and higher in enclosed type than winch-curtain type based on ventilation mode, respectively. In temporal distribution of odorous compounds, their concentrations in summer season (June to August) when ventilation rate in pig building decreased relatively were generally higher than those in winter season (December to February) when ventilation rate in pig building is relatively high. The seasons of spring (March to May) and autumn (September to November) showed middle levels of odorous compounds between summer and winter.
4,200원
