...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Enrichment Factors of Perfluoroalkyl Oxoanions at the Air/Water Interface
【24h】

Enrichment Factors of Perfluoroalkyl Oxoanions at the Air/Water Interface

机译：空气/水界面全氟烷基含氧阴离子的富集因子

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

The refractory, water-bound perfluoro-n-alkyl carboxylate F(CF_2)_nCO_2~- and sulfonate F(CF_nSO_3~-surfactantanions reach remote locations by mechanisms that are not well understood. Here we report experiments inwhich the relative concentrations of these anions on the surface of microdroplets produced by nebulizingtheir aqueous solutions are measured via electrospray ionization mass spectrometry. Enrichment factors f(relative to Br~-:f(Br~-)≡1) increase with n, asymptotically reaching f[F(CF_2)_nSO_3~-]～2 f[F(CF_nCO_200 f(Br~-) values above n 8. The larger f values for F(CF_2)_nSO_3~-over their F(CF_nCO_2~-congeners areconsistent with a closer approach of the builder, less hydrated -SO_3~-headgroup to the air/water interface.A hyperbolic, rather than the predicted linear log f[F(CF_2)_nCO_2~-]vsndependence suggests the onset ofconformational restrictions to interfacial enrichment above n ～ 4. Marine aerosols produced from contaminatedocean surface waters are therefore expected to be highly enriched in F(CF_2
机译：难溶的，水结合的全氟正烷基羧酸盐F（CF_2）_nCO_2〜-和磺酸盐F（CF_nSO_3〜-表面活性剂阴离子通过尚未充分了解的机理到达较远的位置。通过电喷雾电离质谱法测定雾化水溶液产生的微滴的表面，富集因子f（相对于Br〜-：f（Br〜-）≡1）随n的增加而逐渐达到f [F（CF_2）_nSO_3〜 -]〜2 f [F（CF_nCO_200 f（Br〜-）的值大于n8。F（CF_2）_nSO_3〜-在其F（CF_nCO_2〜-同类物上的较大f值与建立者的接近方法一致，较少水合的-SO_3〜头基进入空气/水界面。双曲线而不是预测的线性对数f [F（CF_2）_nCO_2〜-] vs依赖性，表明对n〜4以上的界面富集发生构象限制。因此，被污染的海洋地表水预计为富含F（CF_2

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