物理化学学报Issue(8)：1408-1415,8.DOI:10.3866/PKU.WHXB201406032
用于测量亚硝酸的长光程吸收光谱仪的研制
Development of a Home-Made Long Path Absorption Photometer for the Sensitive Detection of Nitrous Acid
摘要
Abstract
Nitrous acid (HONO) is an important trace gas in tropospheric photochemistry, which plays a significant role in pol uted urban atmosphere. Based on the measuring principle, a long path absorption photometer (LOPAP) for the detection of nitrous acid was built in-house, which uses wet chemical sampling and photometric detection. This instrument aims to overcome the known problems with current HONO measurement techniques and was designed to be a cheap, sensitive, compact, and continuously working HONO monitor for ambient air measurements in the troposphere, or for measurements of higher concentration, e.g., in a smog chamber and in exhaust gases. The system includes two channels, by subtracting the signal of the second channel from the first channel the occurrence of possible unknown interferences can be minimized. The instrument has a detection limit of 9×10-12 mol∙mol-1 and an accuracy of 10%at 5 min resolution, with a good linear relationship exhibited. In addition, we tested probable interferences from NO, NO2, O3, NO2+O3, NO2+SO2, and O3+HONO. It was found that there were interference signals only when NO2 existed (value about 0.02%). With the instrument, 6 days of field observation was performed at the Institute of Chemistry, Chinese Academy of Sciences, Beijing, from 29 August to 4 September, 2013. During the observation we analyzed the diurnal variation of the HONO concentration and the correlation between the HONO concentration and solar radiation intensity, and the concentrations of NOx and NO2. Results from the ratio of HONO/NO2 indicate unknown HONO sources, except for the heterogeneous reaction of NO2.关键词
大气化学/长光程吸收光谱仪/亚硝酸/NO2/干扰/外场观测Key words
Atmospheric chemistry/Long path absorption photometer/Nitrous acid/NO2/Interference/Field observation分类
化学化工引用本文复制引用
陈林,侯思齐,王炜罡,佟胜睿,裴克梅,葛茂发..用于测量亚硝酸的长光程吸收光谱仪的研制[J].物理化学学报,2014,(8):1408-1415,8.基金项目
The project was supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB05010400) and National Natural Science Foundation of China (21190052).中国科学院战略性先导专项B (XDB05010400)及国家自然科学基金(21190052)资助项目 （B）
