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The hygroscopic behavior of particles is important for assessing their environmental and climate effect. The hygroscopic behavior of individual particles has been widely investigated; however, the hygroscopic behavior of mixed particles is still not well-known. Although the Zdanovskii–Stokes–Robinson (ZSR) method could be applied to predict the hygroscopicity of some aerosol mixtures, it is invalid to describe the humidification process of mixed particles when chemical reactions take place. In the present study, the hygroscopic growth factors (GF) of individual oxalic acid (H 2 C 2 O 4 ), nitrate (Ca(NO 3 ) 2, NaNO 3, Zn(NO 3 ) 2 ), and the mixed H 2 C 2 O 4 /nitrate particles were measured using a hygroscopic tandem differential mobility analyzer (H-TDMA). The GFs of these mixtures are much smaller than those predicted by the ZSR method. The chemical composition of individual and mixed particles was characterized by Raman spectrometer. It was found that oxalate dominated the constituents of internal mixtures. Further comparison of the humidification of externally mixed oxalic acid and nitrate revealed that the solubility of oxalate plays a critical role in the replacement of nitrate by oxalate. These results could be helpful for understanding the occurrence of metal oxalate complex in the atmospheric aerosol.
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Ma et al. (2019) studied this question.
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