Annular Denuder System을 利用한 大氣 에어로졸 中 黃酸鹽과 室酸鹽의 濃度特性 = The Concentration Characteristics of Sulfate and Nitrate in Aerososls using Annular Denuder System

다국어 초록 (Multilingual Abstract)

The effects of acidic aerosols have been reported to be more severe, so the recent studies were focused on identifying the characteristics of acidic aerosols, and their formation mechanisms.
Therefore in this study the cyclon/annular deluder/filter pack sampling system was sued to collect and evaluate acidic aerosols in Pusan area in order to investigate the variation characteristics of the secondary inorganic pollutants(SO₄,NO₃).
Forty-eight 12-hr average samples, equally divided into day/night intervals, were collected at Kwangan-dong sampling site where continuous air monitoring system was operated, from June, 1995 to November, 1995.
The important conclusions obtained in this study were as followings ;
The highest and lowest values of monthly averaged concentration occurred in July(12.47±3.15㎍/㎥) and september (4.00±3.15㎍/㎥) for SO₄, and in July(4.10±4.76㎍/㎥), and September(0.41±0.39㎍/㎥) for NO₃. These concentration levels were in the same range as observations in other urban areas.
In order to examine the relationships between the concentrations of sulfate and nitrate, and their influencing factors, the correlation analysis was conducted.
From the results of correlation analysis, the following results were obtained :
1) the value of correlation coefficient between SO₄, and SO₂showed higher in daytime(r=0.46) than in nighttime (r=0.38), and in summer season(r=0.61) than in autumn season(r=0.15) and in condition of relative humidity less than 70%(r=0.50) than in condition of relative humidity more than 70%(r=0.35).
2) Especially the SO₄concentration has the highest correlationships (r=0.94) to SO₂concentration for the data of daytime in summer.
3) The value of correlation coefficient between NO₃ and NO₂ showed higher in daytime(r=0.41) than in nighttime(r=0.74), especially showed highest value(r=0.74) for the data of nighttime in summer.
4) The NO₃concentration has the reverse correlationships to temperature, and the highest value of correlation was calculated as -0.69 for the data of daytime of autumn.
From the above results about concentration characteristics and correlationships for SO₄and NO₃, the following comprehensive conclusions were obtained :
1) There were similar trends of concentration variation between SO₄and NO₃.
2) The concentration of SO₄was closely related with relative humidity but that of NO₃ was related with atmospheric temperature.
3) The formation mechanism by photochemical action and NH₄NO₃dissociation reaction were considered to have influence on the concentration variation of SO₄and NO₄.

목차 (Table of Contents)

• 1. 서론
• 2. 이론적 고찰
• 3. 실험 및 분석방법
• 4. 결과 및 고찰론
• 5. 결 론
• 참고문헌