Abstract. Despite its importance, hygroscopicity of mineral dust aerosol remains
highly uncertain. In this work, we investigated water adsorption and
hygroscopicity of different mineral dust samples at 25 ∘C, via
measurement of sample mass at different relative humidity (RH, up to 90 %)
using a vapor sorption analyzer. Mineral dust samples examined (21 in total)
included seven authentic mineral dust samples from different regions in the
world and 14 major minerals contained in mineral dust aerosol. At
90 % RH, the mass ratios of adsorbed water to the dry mineral ranged from
0.0011 to 0.3080, largely depending on the BET surface areas of mineral dust
samples. The fractional surface coverages of adsorbed water were determined
to vary between 1.26 and 8.63 at 90 % RH, and it was found that the
Frenkel–Halsey–Hill (FHH) adsorption isotherm could describe surface
coverages of adsorbed water as a function of RH well, with AFHH and
BFHH parameters in the range of 0.15–4.39 and 1.10–1.91, respectively.
The comprehensive and robust data obtained would largely improve our
knowledge of hygroscopicity of mineral dust aerosol.
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