Light-absorbing secondary organic material formed by glyoxal in aqueous aerosol mimics

被引：262

作者：

Shapiro, E. L. ^{[1
]}

Szprengiel, J. ^{[1
]}

Sareen, N. ^{[1
]}

Jen, C. N. ^{[1
]}

Giordano, M. R. ^{[1
]}

McNeill, V. F. ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem Engn, New York, NY 10027 USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2009年 / 9卷 / 07期

基金：

美国国家科学基金会;

关键词：

NOX-AIR PHOTOOXIDATIONS; MARINE BOUNDARY-LAYER; HUMIC-LIKE SUBSTANCES; HETEROGENEOUS REACTIONS; OPTICAL-PROPERTIES; OLIGOMER FORMATION; PARTICULATE MATTER; REACTIVE UPTAKE; KINETICS; ACID;

D O I：

10.5194/acp-9-2289-2009

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Light-absorbing and high-molecular-weight secondary organic products were observed to result from the reaction of glyoxal in mildly acidic (pH=4) aqueous inorganic salt solutions mimicking aqueous tropospheric aerosol particles. High-molecular-weight (500-600 amu) products were observed when ammonium sulfate ((NH4)(2)SO4) or sodium chloride (NaCl) was present in the aqueous phase. The products formed in (NH4)(2)SO4 or ammonium nitrate (NH4NO3) solutions absorb light at UV and visible wavelengths. Substantial absorption at 300-400 nm develops within two hours, and absorption between 400-600 nm develops within days. Pendant drop tensiometry measurements show that the products are not surface-active. The experimental results along with ab initio predictions of the UV/Vis absorption of potential products suggest a mechanism involving the participation of the ammonium ion. If similar products are formed in atmospheric aerosol particles, they could change the optical properties of the seed aerosol over its lifetime.

引用

页码：2289 / 2300

页数：12

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