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Synergistic effect in the humidifying process of atmospheric relevant calcium nitrate, calcite and oxalic acid mixtures

机译：大气相关硝酸钙，方解石和草酸混合物在加湿过程中的协同效应

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摘要

Hygroscopicity is a critical property for evaluating aerosol's environmental and climate impacts. Traditional view always considered hygroscopic behavior of aerosol as a water adsorption/absorption-desorption cycle in which the size, water content and morphology etc. are well characterized. However, the chemical reactions between coexisting components in mixed particles during humidifying-dehumidifying process are almost neglected. In this study, we found that there exists synergistic effect among Ca(NO_3)_2, CaCO_3 and H_2C_2O_4 mixtures during humidifying process. Substitution of strong acid (HNO_3) by medium acid (H_2C_2O_4) take place during vapor absorption on Ca(NO_3)_2/H_2C_2O_4 mixture. Moreover, the presence of nitrate exhibits a promotive effect to the reaction between H_2C_2O_4 and CaC0_3 under ambient condition. These results provoke us to rethink the hygroscopic behavior of mixed aerosol in which chemical reaction can greatly change the chemical composition, mixing state and consequently environmental and climate impacts.
机译：吸湿性是评估气溶胶对环境和气候影响的关键属性。传统观点一直认为气溶胶的吸湿行为是一个吸水/吸藏-脱附循环，在该循环中可以很好地表征其大小，含水量和形态等。然而，在加湿-除湿过程中混合颗粒中共存组分之间的化学反应几乎被忽略了。在这项研究中，我们发现在加湿过程中，Ca（NO_3）_2，CaCO_3和H_2C_2O_4混合物之间存在协同作用。在Ca（NO_3）_2 / H_2C_2O_4混合物的蒸气吸收过程中，发生强酸（HNO_3）被中等酸（H_2C_2O_4）取代的情况。而且，硝酸盐的存在对环境条件下H_2C_2O_4与CaCO_3之间的反应具有促进作用。这些结果促使我们重新考虑混合气雾剂的吸湿性能，其中化学反应可以极大地改变化学成分，混合状态，进而影响环境和气候。

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  • 来源
    《Atmospheric environment》 |2012年第4期|p.97-102|共6页
  • 作者

    Qingxin Ma; Hong He;

  • 作者单位

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing 100085, China;

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  • 正文语种 eng
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  • 关键词

    oxalate; mineral dust; mixed aerosol; hygroscopic behavior; synergistic effect;

    机译：草酸盐矿物粉尘混合气雾剂吸湿性协同效应;

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