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Influences of sulfate and nitrate on the hygroscopic behaviour of coarse dust particles

机译：硫酸盐和硝酸盐对粗粉尘颗粒吸湿性能的影响

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摘要

Asian dust particles of diameter > 1 μm collected in southwestern Japan were analyzed with environmental scanning electron microscopy. The hygroscopic behaviour of sea salt-free dust particles were investigated with respect to their contents of sulfate and nitrate. Sulfate- and nitrate-free dust particles (not containing sulfur and nitrogen), as well as sulfate-containing ones, did not change in their crystalline morphology as relative humidity (RH) was increased from 15% to 90%. In contrast, calcium nitrate-containing dust particles appeared in aqueous phase even at 15% RH. These results indicate that nitrate formation on coarse dust particles could substantially enhance the hydrophilicity of the particles and possibly vice versa, whereas sulfate formation could not.
机译：使用环境扫描电子显微镜分析了在日本西南部收集的直径> 1μm的亚洲尘埃颗粒。针对海盐无尘粉尘的硫酸盐和硝酸盐含量，研究了其吸湿性。随着相对湿度（RH）从15％增加到90％，无硫酸盐和硝酸盐的无尘颗粒（不含硫和氮）以及含硫酸盐的颗粒的结晶形态没有变化。相反，即使在15％RH下，含硝酸钙的粉尘颗粒也出现在水相中。这些结果表明，在粗粉尘颗粒上形成硝酸盐可以大大增强颗粒的亲水性，反之亦然，而不能形成硫酸盐。

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