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아파트 실내 환경에서 실시간 측정시스템을 활용한 HONO 농도 측정 및 생성기작 연구
박승식(Seung Shik Park),홍진의(Jin H. Hong),이재훈(Jai H. Lee),김영준(Young J. Kim),조성용(Sung Y. Cho),김승재(Seung J. Kim) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.1
Nitrous acid (HONO) can be produced by heterogenous reactions of nitrogen dioxide on surface materials and direct emission from combustion sources. However, a little is known of indoor HONO levels or the relationship between residential HONO, NO, and NO₂ concentrations in occupied houses. Therefore, we measured simultaneously NO, NO2, and HONO concentrations in living room of an apartment using continuous analyzers to study the production of HONO (June 22~30, 2006). The 4-min average concentrations of indoor NO, NO₂, and HONO were 4.3 (range: 0.4~214.3), 10.3 (2.0~87.3), and 1.8 ppb (0.3~7.7), respectively. Peak levels of HONO up to 7.7 ppb and 24-hr averages as high as 1.7 ppb were measured. In agreement with previous studies, indoor HONO concentrations increased during operation of an unvented gas range. Examination of the observed kinetics suggests that the secondary production of indoor HONO, possibly as a result of heterogeneous reactions involving NO₂ and H₂O is associated with [NO₂]²[H₂O] (r²=0.88) rather than with [NO][NO₂][H₂O] (r²=0.75). Three combustion experiments at nighttime were also carried out to investigate the effects of vented combustion on the HONO, NO, and NO₂ concentrations. It was found to release HONO for 10~15 minutes after NO and NO₂ source was turned off, and peak values were finally attained. Compared to unvented combustion, peak NO₂ and HONO concentrations were 3.2 and 2.0 times lower at weak vented combustion (air flow: 340㎥/hr) and 4.9 and 2.4 times lower at strong vented combustion (air flow: 540 ㎥/hr), respectively, emphasizing importance of operating ventilation hood fan during combustion to improve indoor air quality.
김태영 ( Tae Young Kim ),김민수 ( Min Su Kim ),민병준 ( Byoung Jun Min ),박기민 ( Ki Min Park ),조성용 ( Sung Yong Cho ),김승재 ( Seung Jai Kim ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
The removal of heavy metal ions (Cu(2+) and Ni(2+)) from aqueous solution using oyster shell particles was studied. The adsorption amount of Cu(2+) and Ni(2+) onto the adsorbents was in the following order; Heat treated oyster shell> ethanol treated oyster shell> raw oyster shell. The adsorption equilibrium data for Cu(2+) and Ni(2+) onto the adsorbents were correlated with three adsorption model such as the Langmuir, Freundlich and Sips isotherm. Among them, the Freundlich isotherm gave the best fit to our data. The differences in the rate of adsorption for Cu(2+) and Ni(2+) onto the adsorbents are primarily attributable to the differences in the equilibrium.