Effect of Ammonia on Secondary Organic Aerosol Formation from alpha-Pinene Ozonolysis in Dry and Humid Conditions

KWANGSAM NA; CHEN SONG; CAMERON SWITZER

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Effect of Ammonia on Secondary Organic Aerosol Formation from alpha-Pinene Ozonolysis in Dry and Humid Conditions

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This study examines the influence of ammonia(NH3)on secondary organic aerosol(SOA)formation from the a-pinene/ ozone oxidation system for dry and humid conditions.Aerosol yield differed depending on which OH scavenger was used,with the highest yield noted for CO,followed by cyclohexane and 2-butanol.Number and volume concentrations were quickly increased within the reactor by 15 and 8,respectively,when NH3 was added after the reaction ceased.The increase in number concentration indicated the formation of new particles resulting from gas-to-particle conversion.Moreover,average particle size increased from 242 to 248 nm.The resulting aerosol growth was attributed to ammonium salts formed by the reaction between organic acids and NH3.When NH3 was added to aerosolized c/s-pinonic acid in the environmental reactor,a dramatic increase in both number and volume concentrations of c/s-pinonic acid was observed.This provides further evidence that NH3 can interact with gas-phase organic acids forming condensable salts and thereby enhancing SOA formation.Initially present NH3 significantly enhanced aerosol yield in a-pinene-ozone reactions,regardless of the presence of water vapor.The role of NH3 on SOA formation in the dry and humid conditions is discussed in terms of a theoretical modeling study.

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《Environmental Science & Technology: ES&T》 |2007年第17期|6096-6102|共7页
作者
KWANGSAM NA; CHEN SONG; CAMERON SWITZER;
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作者单位

Center for Environmental Research and Technology(CE-CERT),Bourns College of Engineering,University of California,Riverside,California 92521,and Department of Chemical and Environmental Engineering,Bourns College of Engineering,University of Californi;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境化学;
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Effect of Ammonia on Secondary Organic Aerosol Formation from alpha-Pinene Ozonolysis in Dry and Humid Conditions

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