Real-time measurements of gas-phase organic acids using SF6- chemical ionization mass spectrometry

被引：21

作者：

Nah, Theodora ^{[1
,4
]}

Ji, Yi ^{[1
,2
]}

Tanner, David J. ^{[1
]}

Guo, Hongyu ^{[1
]}

Sullivan, Amy P. ^{[3
]}

Ng, Nga Lee ^{[1
,2
]}

Weber, Rodney J. ^{[1
]}

Huey, L. Gregory ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[3] Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA

[4] City Univ Hong Kong, Sch Energy & Environm, Kowloon, Hong Kong, Peoples R China

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2018年 / 11卷 / 09期

关键词：

ACETIC-ACIDS; CARBOXYLIC-ACIDS; FORMIC-ACID; SOUTHERN CALIFORNIA; AEROSOL-PARTICLES; PERNITRIC ACID; UNITED-STATES; REMOTE AREAS; TRACE GASES; ISCAT; 2000;

D O I：

10.5194/amt-11-5087-2018

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

The sources and atmospheric chemistry of gas-phase organic acids are currently poorly understood, due in part to the limited range of measurement techniques available. In this work, we evaluated the use of SF6- as a sensitive and selective chemical ionization reagent ion for real-time measurements of gas-phase organic acids. Field measurements are made using chemical ionization mass spectrometry (CIMS) at a rural site in Yorkville, Georgia, from September to October 2016 to investigate the capability of this measurement technique. Our measurements demonstrate that SF6- can be used to measure a range of organic acids in the atmosphere. One-hour averaged ambient concentrations of organic acids ranged from a few parts per trillion by volume (ppt) to several parts per billion by volume (ppb). All the organic acids displayed similar strong diurnal behaviors, reaching maximum concentrations between 17:00 and 19:00 EDT. The organic acid concentrations are dependent on ambient temperature, with higher organic acid concentrations being measured during warmer periods.

引用

页码：5087 / 5104

页数：18

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