Formation of Sodium Chloride on the Surface of Sulfate-Rich Gobi Desert Salt in Response to Water Adsorption.

Figure 2 c displays a decreasing trend in the S:O ratio as RH increases from 0% to 70%, which is attributed to water adsorption on the surface that gradually solvates sulfate anions.

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Initially, at the uppermost MED of 0.9 nm, the ratios at all four RH levels align closely with the value for pure NaCl. At increased MED, the 0% RH case exhibits an increasing trend, indicative of Cl – depletion compared to Na + .

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