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Water Interaction with Mineral Dust Aerosol: Particle Size and Hygroscopic Properties of Dust
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsearthspacechem.7b00152 Sara Ibrahim 1 , Manolis N. Romanias 1 , Laurent Y. Alleman 1 , Mohamad N. Zeineddine 1 , Giasemi K. Angeli 2 , Pantelis N. Trikalitis 2 , Frederic Thevenet 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsearthspacechem.7b00152 Sara Ibrahim 1 , Manolis N. Romanias 1 , Laurent Y. Alleman 1 , Mohamad N. Zeineddine 1 , Giasemi K. Angeli 2 , Pantelis N. Trikalitis 2 , Frederic Thevenet 1
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For many years, the interaction between dust particles and water molecules has been a subject of interest for the atmospheric sciences community. However, the influence of the particle size on the hygroscopicity of mineral particles is poorly evaluated. In the current study, diffused reflectance infrared Fourier transform (DRIFT) spectroscopy is used to evaluate the in situ water adsorption on natural Arizona test dust (ATD) particles. Five different ATD size fractions, 0–3, 5–10, 10–20, 20–40, and 40–80 μm, are used, corresponding to the entire range of uplifted mineral particles in the atmosphere (<100 μm). N2 sorption measurement, particle size distribution, and elemental analyses are performed to determine the physicochemical properties of the samples. The water adsorption experiments are conducted in an optical cell under flow conditions at room temperature and under the relative humidity (RH) range of 2–90%. Experimental results are simulated with a modified three-parameter Brunauer–Emmett–Teller (BET) equation. Water monolayers are found to be formed at 13 ± 1, 17 ± 1, 22 ± 2, 25 ± 2, and 28 ± 2% RH for ATD of 0–3, 5–10, 10–20, 20–40, and 40–80 μm, respectively. Additional water layers are formed at higher RH conditions. Thorough comparisons point that smaller particles adsorb water more efficiently. To better assess the impact of size on water uptake, for the first time, the desorption kinetics of water are determined. It is found that water desorption follows second-order kinetics, and results are fitted to determine the desorption rate coefficients for each dust grade. As a conclusion, results provide evidence that the size distribution is a key factor influencing water uptake onto mineral dust that could impact mineral particle scattering ability, adsorption, and photoreactivity properties.
中文翻译：
水与矿物粉尘气溶胶的相互作用：粉尘的粒径和吸湿性
多年来，尘埃粒子与水分子之间的相互作用一直是大气科学界关注的主题。但是，粒度对矿物颗粒的吸湿性的影响评价不佳。在当前研究中，漫反射红外傅里叶变换（DRIFT）光谱用于评估天然亚利桑那测试粉尘（ATD）颗粒上的原位水吸附。使用了五个不同的ATD尺寸分数，分别为0–3、5–10、10–20、20–40和40–80μm，对应于大气中隆起的矿物颗粒的整个范围（<100μm）。N 2进行吸附测量，粒度分布和元素分析，以确定样品的理化性质。水吸附实验是在光学元件中在室温和2–90％的相对湿度（RH）范围内的流动条件下进行的。用修正的三参数Brunauer-Emmett-Teller（BET）方程模拟实验结果。对于ATD为0–3、5–10、10–20、20–40和ATD的水，发现在13±1、17±1、22±2、25±2和28±2％RH的条件下会形成水单层。分别为40–80μm。在较高的RH条件下会形成额外的水层。彻底的比较表明，较小的颗粒可以更有效地吸收水。为了更好地评估尺寸对吸水率的影响，首次确定了水的解吸动力学。发现水的解吸遵循二级动力学，并且拟合结果以确定每种粉尘等级的解吸速率系数。结论是，结果提供了证据，即尺寸分布是影响水分吸收到矿物粉尘上的关键因素，这可能影响矿物颗粒的散射能力，吸附能力和光反应性。
更新日期：2018-03-02
中文翻译：
水与矿物粉尘气溶胶的相互作用：粉尘的粒径和吸湿性
多年来，尘埃粒子与水分子之间的相互作用一直是大气科学界关注的主题。但是，粒度对矿物颗粒的吸湿性的影响评价不佳。在当前研究中，漫反射红外傅里叶变换（DRIFT）光谱用于评估天然亚利桑那测试粉尘（ATD）颗粒上的原位水吸附。使用了五个不同的ATD尺寸分数，分别为0–3、5–10、10–20、20–40和40–80μm，对应于大气中隆起的矿物颗粒的整个范围（<100μm）。N 2进行吸附测量，粒度分布和元素分析，以确定样品的理化性质。水吸附实验是在光学元件中在室温和2–90％的相对湿度（RH）范围内的流动条件下进行的。用修正的三参数Brunauer-Emmett-Teller（BET）方程模拟实验结果。对于ATD为0–3、5–10、10–20、20–40和ATD的水，发现在13±1、17±1、22±2、25±2和28±2％RH的条件下会形成水单层。分别为40–80μm。在较高的RH条件下会形成额外的水层。彻底的比较表明，较小的颗粒可以更有效地吸收水。为了更好地评估尺寸对吸水率的影响，首次确定了水的解吸动力学。发现水的解吸遵循二级动力学，并且拟合结果以确定每种粉尘等级的解吸速率系数。结论是，结果提供了证据，即尺寸分布是影响水分吸收到矿物粉尘上的关键因素，这可能影响矿物颗粒的散射能力，吸附能力和光反应性。
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