• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >A cryogen-free refrigerating preconcentration device for the measurement of C2 to C4 hydrocarbons in ambient air
【24h】

A cryogen-free refrigerating preconcentration device for the measurement of C2 to C4 hydrocarbons in ambient air

机译：用于测量环境空气中C2至C4碳氢化合物的无制冷剂的制冷预浓缩装置

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

A cryogen-free refrigerating preconcentration device for the enrichment of trace amounts of highly volatile organic compounds in the atmosphere prior to analysis has been designed and evaluated. The device consists of a microtrap housed in an insulated box, which is cooled by a conventional refrigeration unit. Experimental parameters, including adsorbent mass, trapping temperature, and thermal desorption temperature, were optimized. The on-line coupling of the device to a GC allows sufficient enrichment and separation of C2 to C4 hydrocarbons in less than 40 min without a second cryotrap. The target compounds analysis showed good linearity (correlation coefficients >0.99) and repeatability (relative standard deviation <5%). Detection limits for the 10 volatile organic compounds ranged from 14 ppt to 52 ppt, under the conditions of a 500 mL sampling volume and -10 °C trapping temperature. Real air sample measurements were conducted at an urban site, and five VOCs including ethane, ethene, propane, propene and 1-butene were detected and quantified.
机译：设计并评估了一种无制冷剂的制冷预浓缩装置，该装置用于在分析之前富集大气中痕量的高挥发性有机化合物。该设备由装在绝缘箱中的微型疏水阀组成，该绝缘箱由常规制冷单元冷却。优化了实验参数，包括吸附剂质量，捕集温度和热脱附温度。装置与GC的在线耦合可在不到40分钟的时间内完成C2至C4碳氢化合物的富集和分离，而无需使用第二个低温阱。目标化合物的分析显示出良好的线性（相关系数> 0.99）和可重复性（相对标准偏差<5％）。在500 mL采样体积和-10°C捕获温度的条件下，这10种挥发性有机化合物的检出限为14 ppt至52 ppt。在城市现场进行了实际的空气样本测量，检测并量化了包括乙烷，乙烯，丙烷，丙烯和1-丁烯在内的五种挥发性有机化合物。

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