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A Study on the Volatilization of Particulate Nitrate (NO3-) During Fine Particle (PM2.5) Measurement  

강병욱 (국립청주과학대학 환경공업과)
이학성 (서원대학교 환경과학과)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.18, no.4, 2002 , pp. 297-303 More about this Journal
Abstract
Fine particles (d$_{p}$ < 2.5 $\mu$m) were measured using an annular denuder system (ADS) in Chongju. The data set was collected on fifty-eight different days with a 24-hr sampling period from October 27, 1995 through August 25, 1996. Particulate nitrate in the ADS was also measured on teflon and nylon filters in series behind denuders to collect HNO$_3$, HNO$_2$, SO$_2$and NH$_3$. From this study. the mean concentration of particulate nitrate of PM$_{2.5}$ in the ADS were seen with the following order: winter (5.05) ＞fall (4.36) ＞spring (3.92) > summer (1.10 $\mu\textrm{g}$/㎥). Nitrate losses, which calculated from the ratio of nylon filter nitrate to the sum of teflon and nylon filter nitrates, varied in the following manner summer (72.2%) > spring (42.6%) > fall (23.5%)> winter (0.4%). Especially, gaseous nitric acid was dominant at temperature higher than 8$^{\circ}C$ while particulate nitrate was major species in total nitrate below that temperature. This indicates the particulate nitrate loss is strongly correlated rather with ambient temperature.e.e.
Keywords
Nitrate; volatilization; teflon filter; nylon filter; $PM_{2.5}$; annular denuder system; dichotomous sampler;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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