从水SO2在水相中的相互作用中直接产生有机硫酸盐
Xiangyu Zhang1,2,3, Junting Qiu1,2,3, Xinming Wang1,2,3
1State Key Laboratory of Advanced Environmental Technology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Environmental science & technology
|January 6, 2026
概括
溶解的二氧化硫 (SO2) 与大气水中的生物类化合物直接形成有机硫酸盐 (OSs),解释了以前未知的气溶质量. 这种SO2路径对大气化学和气候模型具有重要意义.
科学领域:
- 大气化学 大气化学
- 气溶科学 气溶科学
- 有机地化学 有机地化学
背景情况:
- 有机硫酸盐 (OSs) 是二次有机气溶 (SOA) 的关键组成部分.
- 环境SOA质量的很大一部分仍然没有化学解释.
- 生物特类是大气中大量存在的挥发性有机化合物.
研究的目的:
- 为了研究溶解的二氧化硫 (SO2) 与生物性类的直接反应.
- 通过这种新的途径量化有机硫酸盐 (OSs) 的形成速度.
- 评估这种反应对大气中的有机硫酸盐负载和气溶性能的贡献.
主要方法:
- 电子喷雾电离质谱仪 (ESI-MS) 用于产品识别.
- 在不同的溶剂混合物 (乙/水) 中进行动力实验,以确定速率常数.
- 根据pH值进行模拟云和气溶水的研究.
主要成果:
- SO2与特类 (α-pinene,β-pinene,d-limonene,β-caryophyllene,α-terpineol) 的直接反应形成了没有传统氧化剂的OS.
- 对α-pinene + SO2的二次速率常数确定为4.0 ± 0.9 M−1s−1在50%的乙尼/水中,随着含水量增加而增加.
- 在pH3-5 (云/气溶条件下) 的反应速率显著 (60-80M-1s-1对于α-pinene),与已知的氧化途径相比.
结论:
- 溶解的SO2与类的直接反应是大气凝结阶段中OS形成的可行途径.
- 这种机制可以解释大量无法解释的SOA质量.
- 将这种化学成分纳入模型将改善气溶成分,酸度和气候影响的预测.
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