Inorganic salts present in the atmosphere may affect the composition and abundance of secondary organic aerosol. Here, we quantify the effects of salt identity, salt concentration (ionic strength), and solution pH on the partitioning of ambient water-soluble organic gases (WSOC_g) at a site in the eastern United States. The experimental pH (pH = 1–6) and ionic strengths (10⁻³–10¹ mol kg⁻¹) span a wide range of conditions found in atmospheric particles, clouds, and fog droplets. Chloride salts (NaCl, NH₄Cl, and KCl) exhibit a strong salting-out effect at all ionic strengths >0.005 mol kg⁻¹ and pH = 1.8–6. In contrast, sulfate salts (Na₂SO₄, (NH₄)₂SO₄, and K₂SO₄) induce both salting-in and salting-out behaviors, depending on ionic strength and pH. These results suggest that monovalent cations have minimal effect, while ionic strength, pH, and anion identity exert strong effects on the partitioning of ambient organic gases in the atmosphere.

中文翻译：

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将环境有机气体分配为无机盐溶液：盐特性、离子强度和 pH 值的影响

大气中存在的无机盐可能会影响二次有机气溶胶的组成和丰度。在这里，我们量化了盐特性、盐浓度（离子强度）和溶液 pH 值对美国东部一个地点的环境水溶性有机气体 (WSOC _g )分配的影响。实验 pH (pH = 1–6) 和离子强度 (10 ^-3 –10 ¹  mol kg ^-1 ) 跨越了大气粒子、云和雾滴中发现的各种条件。氯化物盐（NaCl、NH ₄ Cl 和 KCl）在所有离子强度 > 0.005 mol kg ^-1和 pH = 1.8-6时都表现出强烈的盐析作用。相反，硫酸盐（Na ₂ SO ₄、(NH ₄ ) ₂ SO ₄和 K ₂ SO ₄ ) 会引起盐溶和盐析行为，这取决于离子强度和 pH 值。这些结果表明，单价阳离子的影响很小，而离子强度、pH 值和阴离子特性对大气中环境有机气体的分配有很大的影响。