Abstract. The reaction of sea salt (or biomass burning) particles with sulfuric acid and nitric acid leads to the displacement of chloride relative to sodium (or potassium). We have developed a new particle mass spectrometer to quantify non-refractory and refractory sulfate aerosols (referred to as refractory aerosol thermal desorption mass spectrometer: rTDMS). The combination of a graphite particle collector and a carbon dioxide laser enables high desorption temperature (up to 930 °C). Ion signals originating from evolved gas molecules are detected by a quadrupole mass spectrometer. Here we propose a new method to quantify the mass concentrations of sodium nitrate (NaNO₃: SN), sodium chloride (NaCl: SC), sodium sulfate (Na₂SO₄: SS), potassium nitrate (KNO₃: PN), potassium chloride (KCl: PC), and potassium sulfate (K₂SO₄ : PS) particles by using the rTDMS. Laboratory experiments were performed to test the sensitivities of the rTDMS to various types of particles. We measured ion signals originating from single-component particles for each compound, and found a good linearity (r² > 0.8) between the major ion signals and mass loadings. We also measured ion signals originating from internally mixed SN + SC + SS (or PN + PC + PS) particles, and found that the temporal profiles of ion signals at m/z 23 (or 39) were characterized by three sequential peaks associated with the evolution of the desorption temperature. We tested potential interferences in the quantification of sea salt particles under real-world conditions by artificially generating "modified" sea salt particles from a mixture of diluted seawater and SS/SN solution. Based on these experimental results, the applicability of the rTDMS to ambient measurements of sea salt particles is discussed.

中文翻译：

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一种通过热解吸气溶胶质谱法定量颗粒状钠盐和钾盐（硝酸盐、氯化物和硫酸盐）的新方法

摘要。海盐（或生物质燃烧）颗粒与硫酸和硝酸的反应导致氯化物相对于钠（或钾）的置换。我们开发了一种新的粒子质谱仪来量化非耐火和耐火硫酸盐气溶胶（称为耐火气溶胶热解吸质谱仪：rTDMS）。石墨颗粒收集器和二氧化碳激光器的组合可实现高解吸温度（高达 930 °C）。源自逸出气体分子的离子信号由四极杆质谱仪检测。在这里，我们提出了一种新方法来量化硝酸钠 (NaNO ₃ : SN)、氯化钠 (NaCl: SC)、硫酸钠 (Na ₂ SO ₄: SS)、硝酸钾 (KNO ₃ : PN)、氯化钾 (KCl: PC) 和硫酸钾 (K ₂ SO ₄  : PS) 颗粒使用 rTDMS。进行了实验室实验以测试 rTDMS 对各种类型颗粒的敏感性。我们测量了来自每种化合物的单组分颗粒的离子信号，发现 主要离子信号和质量负载之间具有良好的线性 (r ² > 0.8)。我们还测量了源自内部混合 SN + SC + SS（或 PN + PC + PS）粒子的离子信号，并发现离子信号在m/z23 (或 39) 的特征在于与解吸温度的演变相关的三个连续峰。我们通过从稀释海水和 SS/SN 溶液的混合物中人工生成“改性”海盐颗粒，测试了在现实世界条件下量化海盐颗粒的潜在干扰。基于这些实验结果，讨论了 rTDMS 在海盐颗粒环境测量中的适用性。