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| DOI | 10.1016/j.atmosenv.2021.118671 |
| The development and evaluation of a sequential aerosol-water measurement system | |
| Sun S.-E.; Chang S.-Y.; Lee C.-T. | |
| 发表日期 | 2021 |
| ISSN | 1352-2310 |
| 卷号 | 264 |
| 英文摘要 | Aerosol water content (AWC) is associated with aerosol formation, aerosol–cloud interaction, and atmospheric visibility degradation; however, few studies have directly measured the mass of water in aerosols. Studies on AWC have employed modeling techniques [e.g., ISORROPIA II and the Extended Aerosol Inorganics Model (E-AIM) III)], the thermal-ramp Karl-Fisher method, and conducted volume-based measurements by using a hygroscopic tandem differential mobility analyzer (H-TDMA). The current study developed a sequential aerosol-water measurement system (SAWMS) that sequentially collects particles with up to 10 filters and measures AWC immediately after the collection. With this system, the loss of semi-volatile species was lower, and contamination during sample transport was reduced. The AWC measurement results were validated by comparing them with modeling results obtained in this study and the results obtained in previous studies. The measurement results for three aerosolized salts—NaCl, NH4NO3, and (NH4)2SO4—were found to be in favorable agreement with the corresponding modeling results and results from previous studies. The relationship between aerosol mass change (AMC) and relative humidity (RH) was investigated. The deliquescence RH (DRH) was 75%, 63%, and 81% for NaCl, NH4NO3, and (NH4)2SO4, respectively, whereas efflorescence RH was observed only for NaCl at 40%–50% RH. The AWC of mixed inorganic salts exhibited weak mutual DRH at 45%–50% RH. By contrast, the AWC obtained using ISORROPIA II and E-AIM III exhibited a gradual rather than an abrupt change of RH upon deliquescence. The measured AWC values were more similar to the values obtained with ISORROPIA II than to the values obtained with E-AIM III. To compare our mass-based measurements with the volume-based measurements obtained in previous studies using H-TDMAs, we derived the relationships of hygroscopicity parameter and growth factor with AMC. We discovered that the aforementioned relationships were comparable. In summary, the developed SAWMS integrates a sequential aerosol collection device with a gas chromatograph equipped with a thermal conductivity detector; the system performs well in the quantification of AWC and provides an additional chance of the filter for further chemical analysis. © 2021 Elsevier Ltd |
| 关键词 | Aerosol humidographsAerosol water measurementGrowth factorHygroscopicity parameter |
| 语种 | 英语 |
| scopus关键词 | Aerosols; Atmospheric humidity; Atmospheric movements; Drying; Parameter estimation; Sodium chloride; Surface chemistry; Thermal conductivity; Aerosol humidograph; Aerosol mass; Aerosol water measurement; Growth factor; Hygroscopicity parameter; Inorganics; Mass change; Measurement system; Modeling results; Water measurements; Chemical analysis; growth factor; aerosol; chemical analysis; hygroscopicity; relative humidity; thermal conductivity; volcanic cloud; water content; aerosol; aqueous solution; Article; body water; controlled study; humidity; method detection limit; room temperature; thermal conductivity; thermodynamics; volatilization; water contamination; water content; wettability; Martes |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248240 |
| 作者单位 | Graduate Institute of Environmental Engineering, National Central University, Taoyuan, 320, Taiwan; Department of Public Health, Chung Shan Medical University, Taichung, 402, Taiwan |
| 推荐引用方式 GB/T 7714 | Sun S.-E.,Chang S.-Y.,Lee C.-T.. The development and evaluation of a sequential aerosol-water measurement system[J],2021,264. |
| APA | Sun S.-E.,Chang S.-Y.,&Lee C.-T..(2021).The development and evaluation of a sequential aerosol-water measurement system.ATMOSPHERIC ENVIRONMENT,264. |
| MLA | Sun S.-E.,et al."The development and evaluation of a sequential aerosol-water measurement system".ATMOSPHERIC ENVIRONMENT 264(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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