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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society for Atmospheric Environment
Journal Basic Information
Journal DOI :
Korean Society for Atmospheric Environment
Editor in Chief :
Volume & Issues
Volume 15, Issue 6 - Dec 1999
Volume 15, Issue 5 - Oct 1999
Volume 15, Issue 4 - Aug 1999
Volume 15, Issue 3 - Jun 1999
Volume 15, Issue 2 - Apr 1999
Volume 15, Issue 1 - Feb 1999
Volume 5, Issue 4 - 00 1999
Volume 5, Issue 3 - 00 1999
Volume 15, Issue E - 00 1999
Selecting the target year
Current Wet Deposition of Pu Isotopes in the mid-Yellow Sea Coast of Korea
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 79~87
concentrations in precipitation were determined for the period of May 1994 to August 1996 in oder to describe current
deposition at the mid-western coat of Korea (Ansan, 37
concentration in daily precipitation varied from 0.05 to 131
with a geometric mean of
. The concentration was high in the period of Yellow Sand Storm in spring and low in wet summer monsoon. The specific
concentration in daily precipitation appears to be controlled by the
input to the atmosphere in spring and washout effects by precipitation in the wet summer monsoon. Wet depositional flux of
varied from 4 to 123
with a geometric mean of
and with a maximum in the period of Yellow Sand Storm and a minimum in the period of wet summer monsoon.
activity raios(0.04~0.31) in precipitation for March-June period suggested that one of the major sources of Pu isotopes falling in Ansan area is the arid region of the Chinese continent.
A Study on the Behavior and Deposition of Acid Precipitation-comparison of Chemical Composition of Rain Water between Chunchon and seoul
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 89~100
The rain water samples were collected at Chunchon and Seoul by using wet only automatic sampler from January 1996 through 1997. The daily base rain water samples collected over than 95% rainy events components,
, by ion chromatography. In 1996, about 77% of sampled rain water showed below pH 5.6 and the 60% of rain water was lower than pH 5.0. The volume weighted average pH was 4.7 at all sites. In 1997, the volume weighted average pH was 4.6 and 4.9 at Seoul and Chunchon, respectively. Among the rain water samples,, 87% and 55% fo samples showed below than pH 5.6 and 5.0, respectively. The pH value of Chunchon was significantly (p＜0.05) lower than Seoul at the rain samples for less than 20mm rainfall. However conductivity of the rain samples were 20.9
S/cm for 1996 and 27.7
S/cm for 1997 at Seoul, and 19.1
S/cm for 1996 and 14.1
S/cm for 1997 at Chunchon.
contributed 65.9% and 29.6% of free acidity at Seoul, respectively. The ratio of [
] were 0.43 at Seoul and 0.51 at Chunchon for rain samples for less than 20mm rainfall. The annual wet deposition of
, respectively, 568.8kg/
at Seoul for 1996; 656.4kg/
, 27.2kg /
at Seoul for 1997; 116.9kg/
at chunchon for 1996; 100.2kg/
at chunchon for 1997.
A Study on Chemical Composition of Dustfall Sampled in Cheju Area: 2. Identification of Source
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 101~111
In previous study, the local trends in dustfall chemistry and deposition were determined and the characteristics of chemical compositions among dustfall, TSP and rainwater were also compared. Based on the previous results, in this study, the effects of sea salts and soil and soil on the chemical composition of dustfall were studied and then the sources of dustfall in Cheju area were tentatively identified by principal component analysis(PCA)
A Study of Concentration Characteristics of Acidic Air Pollutants During the Summer and Winter Seasons in Seoul
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 113~120
Winter and summer samples were collected from January 3 to February 7, 1997 and July 26 to September 11, 1997, respectively, in Seoul. This study was to characterize the concentrations of the annular denuder system (ADS) were
in the gas phase, and
, NO3-, and
in the particulate phase. All chemical species monitored from this study showed statistical seasonal variations except for
. Nitric acid (HNO3) and ammonia (
) exhibited substantially higher concentrations during the summer, while nitrous acid (
) and sulfur dioxide (
) concentrations were higher during the winter.
were higher leves in the winter. High correlations were found among
during two seasons.
Evaluation of Methodology for the Measurement of VOCs in the Air by Adsorbent Sampling and Thermal Desorption with GC Analysis
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 121~138
This study was carried out to evaluate the performance of a sampling and analytical methodology for the measurement of selected volatile organic compounds (VOCs) in the ambient air. VOCs were determined by the adsorbent tube sampling and automatic thermal desorption coupled with GC/FID and GC/MSD analysis. Target analytes were aromatic VOCs, including BTEX, 1,3,5-and 1,2,4,-trimethylbenzenes(TMBs), and naphthalene. The methodology was investigatedwith a wide range of performance criteria such as repeatability, linearity, lower detection limits, collection efficiency, thermal conditioning, breakthrough volume and calibration methods using internal and external standards. standards. Stability of samples collected on adsorbent tubes during storage was also investigated. In addition, the sampling and analytical method developed during this study was applied to real samples duplicately collected in various indoor and outdoor environments. Precisions for the duplicate samples and distributed volume samples appeared to be well comparable with the performance criteria recommended by USEPA TO-17. The audit accuracy was estimated by inter-lab comparison of both duplicate samples and standard materials between the two independent labs. The overall precision and accuracy of the method were estimated to be within 30% for major aromatic VOCs such as BTEX. This study demonstrated that the adsorbent sampling and thermal desorption method can be reliably applied for the measurement of BTEX in ppb levels frequently occurred in common indoor and ambient environments.
Anomaly Test for Ozone Concentration Data from National Air Monitoring Stations
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 139~150
The ozone concentrations measured at the National Air Monitoring Stations between 1990 and 1995 were reviewed to detect any anomalies in the measurements. By screening the cases, in which variation of the ozone concentration from the previous measured value is greater than 75ppb, 125 station-days were identified as the test cases for the anomaly test. Historical and parallel consistencies of the measured concentrations were examined by plotting data for each test case. The detected anomalies can be classified into four categories; single outliers, anomalous variations during the startup period, baseline rises, and fluctuations in th diurnal variations. Anomalies were detected in as many as 80 cases among 125 test cases. Because of these anomalies, the number of hours exceeding 100ppb in the areas other than the Greater Seoul Area(GSA) could decrease from 157 to 107. Further studies for developing the methodology for eliminating the abnormal monitoring data are warranted for the data from the National Air Monitoring Stations are official to the both inside and outside of the country
Offsite Consequence Analysis for Accidental Release Scenarios of Toxic Substances in the Yochon Area
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 151~158
Offsite consequences resulting form worst-case scenarios involving release of toxic substances in the Yochon area were estimated using the ALOHA(Areal Locations of Hazardous Atmospheres) model. Eight toxic substances, including NH3, were considered; five were toxic gases and three were toxic liquids at ambient temperature. For toxic gases, the entire quantity was assumed to be released at a constant rate during a 10-minute period. For toxic liquids, the entire quantity stored in the tank was assumed to be spilled and spread and spread instantaneously to form a pool with a depth of 1cm, and then evaporated over some period of time. Except for phosgene and toluene 2,4-diisocyanate, for which concentration levels corresponding to human health effects are very low, average distances of the area at risk of adverse health effects for a 1- tom release were predicted to be 2.3±1.1 km for the worst-case meteorological conditions and 0.93±0.69km under typical meteorological conditions of the Yochon are. Because a large number of people were predicted to be affected in the current analysis, refined analyses considering both realistic accident scenarios and topographic effects were warranted
A Comparative study on Ambient Air Quality Standard for Ozone
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 159~173
Based on air quality monitoring data('89~'97) operated by the Department of Environment, we provide various fundamental statistics for ground ozone. The purpose of this paper are to review the national ambient ozone standard, to study spatial distribution of ozone. Since we, in Korea, calculate average ozone level, to examine the occurrences of ozone level 3 times a day (1~8, 9~16, 17~24 hours), the method does not seem to be scientifically sound comparing to a running average method adapted by the USEPA. When we counted the number of cases with 8-h average O3 level exceeding 60ppb(8-h average standard in Korea)and 80 ppb (that in the U.S.A) and also when we calculated 8-hour average ozone level based on th US method, some regions were classified as non-attainment areas. Especially in Seoul, results of spatial distribution analysis showed that high level ozone over 80 ppb was observed at Kuui-Dong and Pangi-Dong in the eastern part and at Ssangmun-Dong in the northeastern part. Also, occurrences of ozone episode defined as number of days then ozone level exceeding 80 ppb for 3 consecutive hours were extensively reviewed in this paper.
A Study on individual Diesel Particles by SEM/EDX
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 175~182
Scanning electron microscopy (SEM) has played an important role in receptor modeling area because it is a powerful tool for characterizing individual particles. The purpose of the study was to classify individual diesel particles base on statistical analysis and image analysis by SEM/EDX (energy dispersive x-ray analyser). The diesel particles were sampled by both a modified CVS 75 mode and a high speed mode with a chassis dynamometer. The SEM/EDX system provides various physical parameters including particle's particle diameter and chemical information. Thus density and mass of the diesel particle were estimated cased on its chemical composition and further fractal dimensions of the diesel particle were obtained by the Hurst exponent method. The fractal dimension in the sample of modified CVS 75 mode was higher than the high speed mode. Finally, mass fractions for a diesel vehicle as a source profile were estimated cased on a particle class concept.
The Decomposition of Carbon-dioxide and Methanation with Activated Magnetite
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 183~190
Magnetite was synthesized with
, and NaOH for the decomposition of carbon dioxide and for the study of the methane formation. The chemical equivalent ratio was changed from 0.5 to 1.50 for the magnetite synthesis. The chemical equivalent ratio was fixed in 1.00, and Nickel chloride and Rhodium chloride equally added and synthesized with the ratio was of 0.10~10.00 mole%. The crystal strucure of the synthesized magnetite was measured XRD. Putting synthesized magnetite in the reactor and using hydrogen gas oxygen-deficient magnetite was made. Injecting carbon dioxide in the reactor, the decomposition reaction was experimented. The formation of methane was confirmed injecting hydrogen gas in the reactor after carbon dioxide was decomposed.
A Study of
Adsorption Characteristics by Adsorbents in a Fixed Bed Reactor
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 191~199
This study evaluated the availability as an alternative adsorbent which is cheaper and more efficient than CuO/
which have been studing vigorously to remove
. Five adsorbents (CuO/
, Iron ore, Slag, LD slag,
) was employed in a fixed bed reactor.
breakthrough curves were obtained as a function of temperature, initial gas velocity and particle size. Saturation capacities calculated by the numerical integration of breakthrough curves of
increased with increasing reaction temperature.
breakthrough curve equation of
for this system can be expressed as Kr=3,914,000 exp(-37,329.86/RT). By means of the breakthrough curve, the influence of bed height on breakthrough time was also estimated.
Emission Control of Fine Dust from Gas-Solid Cyclone
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 201~210
Cyclones have been extensively used in the industry for removing fine particles from the gaseous streams, based on simplicity in design and construction in association with low cost and flexibility to operate in extreme and harsh environments. However, industrial cyclones are typically not very efficient for particles smaller than 10μm. In this work, in order to improve the separation efficiency of reverse flow cyclones, a simple device named Post Cyclone(Poc) in installed on the top of an existing cyclone. Thereby the residual swirl present at the outlet (vortex finder) of a conventional cyclone has been used to capture the escaped dust from the cyclone in the PoC. The performance of PoC was closely evaluated by changing configuration of the PoC and operation condition. In addition, the dust behaviour in th PoC was investigated based on the hypothesis of residual vortex.
Air Quality in Northeast Asia with Emphasis on China
Journal of Korean Society for Atmospheric Environment, volume 15, issue 2, 1999, Pages 211~217
Data on ambient levels of
, and their emissions in Northeast Asia with special emphasis on China are collected and discussed. Also, study results on long-range transport of air pollutants in the region were briefly discussed. It was found that emissions of air pollutants in China are dominant over the region.