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Direct Quantification of the Effect of Ammonium on Aerosol Droplet pH

机译：直接定量铵对气溶胶液滴pH的作用

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摘要

Ammonium is an important atmospheric constituent that dictates many environmental processes. The impact of the ammonium ion concentration on 10-50 μm aerosol droplet pH was quantified using pH nanoprobes and surface-enhanced Raman spectroscopy (SERS). Sample solutions were prepared by mixing 1 M ammonium sulfate (AS), ammonium nitrate (AN), sodium sulfate (SS), or sodium nitrate (SN) solutions with 1 M phosphate buffer (PB) at different volume ratios. Stable pH values were measured for pure PB, AS, and AN droplets at different concentrations. The centroid pH of 1 M PB droplets was ~11, but when PB was systematically replaced with ammonium (AS- or AN-PB), the centroid pH within the droplets decreased from ≈11 to 5.5. Such a decrease was not observed in sodium (SS- or SN-PB) droplets, and no pH differences were observed between sulfate and nitrate salts. Ammonia partitioning to the gas phase in ammonium-containing droplets was evaluated to be negligible. Raman sulfate peak (～980 cm~(-1)) intensity measurements and surface tension measurements were conducted to investigate changes in ion distribution. The pH difference between ammonium-containing droplets and ammonium-free droplets is attributed to the alteration of the ion distribution in the presence of ammonium.
机译：氨是一种重要的大气成份是决定许多环境过程。铵离子浓度对10-50微米的气溶胶液滴的pH的影响，使用pH值纳米探针定量和表面增强拉曼光谱（SERS）。样品溶液通过将1M的硫酸铵（AS），硝酸铵（AN），硫酸钠（SS），或硝酸钠（SN），在不同的体积比的1M磷酸盐缓冲液（PB）溶液制备。在不同浓度的纯PB，AS，和AN的液滴，测定稳定的pH值。的1M PB液滴的重心pH为〜11，但是，当PB进行了系统与铵（AS-或AN-PB）来代替，该液滴内的质心pH为≈11下降至5.5。这种减少未在钠（SS-或SN-PB）的液滴观察到的，和硫酸盐和硝酸盐之间没有观察到pH值差异。氨分区来在含铵的液滴气相评价为可忽略的。硫酸盐拉曼峰值（〜980厘米〜（-1））的强度测量和表面张力测量以调查在离子分布的变化。含铵的液滴和自由铵液滴之间的pH差异归因于在铵的存在下，离子分布的改变。

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  • 来源
    《Environmental Science & Technology》 |2021年第1期|778-787|共10页
  • 作者

    Qishen Huang; Haoran Wei; Linsey C. Marr; Peter J. Vikesland;

  • 作者单位

    Department of Civil and Environmental Engineering Virginia Tech Blacksburg Virginia 24061 United States Virginia Tech Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center Blacksburg Virginia 24061 United States;

    Department of Civil and Environmental Engineering University of Wisconsin-Madison Madison Wisconsin 53706 United States;

    Department of Civil and Environmental Engineering Virginia Tech Blacksburg Virginia 24061 United States Virginia Tech Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center Blacksburg Virginia 24061 United States;

    Department of Civil and Environmental Engineering Virginia Tech Blacksburg Virginia 24061 United States Virginia Tech Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center Blacksburg Virginia 24061 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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