The Dry Deposition of Mass, Metal and Anions Species in Taichung, Taiwan

台灣省台中地區之微粒、重金屬(鈣、鐵、鉛、鋅、錳、銅、鎘及鉻)及陰離子(氯離子，硝酸根及硫酸根離子)之乾沈降，濃度及粒徑分佈於本研究中一併被討論，採樣時間則是從1994年9月至1994年12月，大氣中之濃度則同時用PS-1採樣器來偵測，而精徑分佈則是以MOUDI(多層均勻微孔採樣器)來分佈，研究結果顯示(1)微粒呈現了雙峰分佈之情形，鈣及鐵(主要之地殼元素)則呈現了雙峰分佈之情況。(2)陰離子分析結果則顯示了硝酸根有著較高之乾沈降值而硫酸根則有較高之濃度值。(3)Hodgson模式則此NaII之模式更適合於此研究中用來推估這是由於氣象資料不是直接由採樣點分析所得之結果。

關鍵字

微粒；重金屬；陰離子；乾沈降；粒徑分佈；乾沈降模式

並列摘要

Atmospheric particle , eight metal elements (Ca, Fe, Pb, Zn, Mn, Cu, Cd, and Cr), and anions (CI^-, NO^(-3), and SO_4^(2-)) dry deposition flux , concentration , and size distributIOn in the ambient air were measured in Tunghai University (THU), Taichung , Taiwan from September to December , 1994. Ambient suspended particles concentration were simultane- ously collected by PS- l. And the size distribution were measured by MOUDI^(TM). The results indicated that (l)Mass were shown a bimodel particle size distribution. Ca and Fe, the primarily crustal elements , were displayed unimodel size distribution. Pb, Mn, Cr, and Zn, the elements of anthropogenic origin , were also shown a bimodel size distribution. (2)The anions analysis showed the N0_3- had the higher dry deposition flux and the S0_4^(2-) had the higher atmospheric concentration for anions .(3)The Hodgson model is more appropriable in prediction dry deposition flux than Noll & Fang's model in this study. (4)The correlation coefficient between the wind speed and every metals' fluxes were low due to the indirect measurement of the weather data.

並列關鍵字

Particles ； Heavy Metals ； Anions ； dry deposition ； Model

國際替代計量

The Dry Deposition of Mass, Metal and Anions Species in Taichung, Taiwan

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