The influence of solvent and pH on determination of the light absorption properties of water-soluble brown carbon

被引：44
作者：
Mo, Yangzhi [1 ,4 ]
Li, Jun [1 ]
Liu, Junwen [1 ]
Zhong, Guangcai [1 ]
Cheng, Zhineng [1 ]
Tian, Chongguo [2 ]
Chen, Yingjun [3 ]
Zhang, Gan [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
[2] Chinese Acad Sci, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
[3] Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
ATMOSPHERIC ENVIRONMENT | 2017年 / 161卷
关键词：
Brown carbon; Water-soluble carbon; HULIS; pH; Light absorption properties; OPTICAL-PROPERTIES; ORGANIC-CARBON; HUMIC-LIKE; SUBSTANCES HULIS; MOLECULAR-WEIGHT; BLACK CARBON; AEROSOL; ULTRAVIOLET; EXTRACTS; SPECTRA;
D O I：
10.1016/j.atmosenv.2017.04.037
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Brown carbon (BrC) is a class of unidentified organic compounds that efficiently absorb solar radiation in the ultraviolet (UV) wavelengths, and its effects on climate are poorly understood. Measurement of the light absorption properties of BrC in liquid extracts is a commonly used BrC analytical method, but the optical characteristics of water-soluble BrC may be affected by pH and solvent. In this work, we investigated the effects of concentration, pH, and solvent on water-soluble BrC from ambient aerosols, biomass burning, diesel exhaust, and a humic substance standard. The results showed that pH can affect the light absorption properties of water-soluble BrC, whereas concentration had little effect, except low concentrations dissolved in methanol. Therefore, the pH of humic-like substances (HULLS) should be adjusted to the same value as water-soluble carbon (WSOC) for calculating the light-absorption contribution of HULLS to WSOC. The-light absorptivity of water-soluble BrC dissolved in methanol was higher than that in water. Considering the pH and concentration effects, extraction of WSOC with a particle: water ratio of 0.25 mg/mL is proposed as well as to get a reference pH for light absorption analysis. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：90 / 98
页数：9
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