...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Speciation of sulfate in size-fractionated aerosol particles using sulfur K-edge X-ray absorption near-edge structure
【24h】

Speciation of sulfate in size-fractionated aerosol particles using sulfur K-edge X-ray absorption near-edge structure

机译：利用硫K边缘X射线吸收近边缘结构对大小分级的气溶胶颗粒中的硫酸盐进行形态分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

X-ray absorption near-edge structure (XANES) at sulfur K-edge was used to determine the sulfate species present in size-fractionated aerosol particles based on the postedge structure after the main absorption peak in the XANES region. A comparison of the XANES spectra of reference sulfate materials and aerosol samples collected in Tsukuba in Japan clearly showed that (NH4)(2)SO4 was the main sulfur species in particles with a smaller diameter and CaSO(4)(circle)2H(2)O (gypsum) was the main sulfur species in particles with a larger diameter. A simulation of the XANES spectra by reference materials allows us to obtain the quantitative mixing ratios of the different sulfate species present in the aerosol samples. The presence of minor sulfur species other than (NH4)(2)SO4 and gypsum at the surface of mineral aerosols is suggested in our simulations and by a surface-sensitive conversion electron/He-ion yield XANES. In the absence of a contribution from a large dust event, the mole concentration of gypsum in the mineral aerosol fraction (particle diameter > 1 mu m) determined by XANES is similar to that of Ca which is determined independently using ion chromatography. This shows that the Ca and sulfate in the mineral aerosols are present only as gypsum. Considering that calcite is the main Ca mineral in the original material arising from an arid and semiarid area in China, it is strongly suggested that gypsum is formed in aerosol during its long-range transportation by a reaction between calcite and sulfate ions.
机译：硫K边缘处的X射线吸收近边缘结构（XANES）用于根据XANES区域中的主要吸收峰之后的后边缘结构，确定存在于尺寸分级的气溶胶颗粒中的硫酸盐种类。比较日本硫酸盐物质和从日本筑波收集的气溶胶样品的XANES光谱，可以清楚地看出，（NH4）（2）SO4是直径较小的颗粒和CaSO（4）（circ）2H（2 O（石膏）是直径较大的颗粒中的主要硫物种。通过参考材料对XANES光谱进行的模拟使我们能够获得气溶胶样品中存在的不同硫酸盐物种的定量混合比。在我们的模拟中以及通过表面敏感的转换电子/ He离子产生量XANES暗示了矿物气溶胶表面除（NH4）（2）SO4和石膏外还存在少量的硫。在没有大型粉尘事件的影响的情况下，通过XANES测定的矿物气溶胶级分（粒径> 1μm）中的石膏摩尔浓度类似于使用离子色谱法独立测定的Ca摩尔浓度。这表明矿物气溶胶中的Ca和硫酸盐仅以石膏形式存在。考虑到方解石是原始材料中来自干旱和半干旱地区的主要Ca矿物，因此强烈建议通过方解石与硫酸根离子之间的反应在气溶胶的远距离运输过程中会形成石膏。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号