A multifunctional HTDMA system with a robust temperature control
A multifunctional HTDMA system with a robust temperature control
复制标题
DOI：
10.1007/s00376-009-8134-3
复制
发表时间：
2009-11
影响因子：
5.8
通讯作者：
X. Ye;Tianyi Chen;Dawei Hu;Xin Yang;Jianmin Chen;Renyi Zhang;Alexei F. Khakuziv-;Lin Wang
中科院分区：
文献类型：
--
作者：
X. Ye;Tianyi Chen;Dawei Hu;Xin Yang;Jianmin Chen;Renyi Zhang;Alexei F. Khakuziv-;Lin Wang
大气气溶胶的吸湿性显著影响其尺寸分布、云凝结核能力、大气停留时间和气候强迫。为了研究中国地区气溶胶粒子和严重灰霾的吸湿行为，在复旦大学设计并建造了一套吸湿式串列差动分析系统。它可用作扫描迁移率颗粒测量系统，测量直径在20-1000 nm范围内的颗粒尺寸分布，以及在相对湿度为20%-90%RH范围内测量直径在20-400 nm之间的气溶胶颗粒的吸湿性分析仪。它还可以测量无机酸或半挥发性有机化合物的吸收对气溶胶吸湿行为的影响，例如大气粉尘或其混合物中的典型无机盐。性能测试表明，系统测量的标准聚苯乙烯乳胶球(PSLS)的粒径为197 nm，与标准直径D=199±6 nm以及重复运行的标准偏差SD=8.9×10−4符合得很好。此外，(NH4)2SO4和NaNO3模型化合物的吸湿生长因子与Köhler理论曲线符合较好。结果表明，HTDMA系统是研究亚微米级气溶胶吸湿行为的有力工具，可以满足中国大气气溶胶实验室研究和野外观测的需要。
The hygroscopicity of atmospheric aerosols significantly influences their size distribution, cloud condensation nuclei ability, atmospheric residence time, and climate forcing. In order to investigate the hygroscopic behavior of aerosol particles and serious haze in China, a Hygroscopic Tandem Differential Mobility Analyzers (HTDMA) system was designed and constructed at Fudan University. It can function as a scanning mobility particle sizing system to measure particle size distribution in the range of 20–1000 nm in diameter, as well as a hygroscopicity analyzer for aerosol particles with diameters between 20–400 nm in the range of 20%–90% RH (relative humidity). It can also measure the effect of uptake of inorganic acids or semi-VOCs on the hygroscopic behavior of aerosols, such as typical inorganic salts in atmospheric dust or their mixtures. The performance tests show that the system measured particle size of the standard polystyrene latex spheres (PSLs) is 197 nm, which is in excellent agreement with the certified diameter D=199±6 nm, as well as a standard deviation of the repeated runs SD=8.9×10−4. In addition, the measured hygroscopic growth factors of the model compounds, (NH4)2SO4and NaNO3, agree with the Köhler theoretical curves. The results indicate that the HTDMA system is an excellent and powerful tool for studying the hygroscopic behavior of submicron aerosols and meets the demand required for laboratory research and fieldwork on atmospheric aerosols in China.