• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International symposium on the measurement of toxic and related air pollutants >Environmental Applications of MC-ICPMS: Using Lead Isotope Ratios From Precipitation Samples to Help Constrain Pollutant Source and Fate in the Great Lakes and South Florida Regions
【24h】

Environmental Applications of MC-ICPMS: Using Lead Isotope Ratios From Precipitation Samples to Help Constrain Pollutant Source and Fate in the Great Lakes and South Florida Regions

机译：MC-ICPMS的环境应用：利用降水样品的铅同位素比，帮助在大湖和南佛罗里达地区建立污染物源和命运

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Methods to obtain precise measurements of Pb isotope ratios from precipitation samples containing low concentrations of Pb were developed using magnetic sector multiple-collector ICP-MS technology (MC-ICPMS). A comparison of the accuracy and precision of Pb isotope ratios obtained using MC-ICPMS versus conventional ICP-MS was then determined on archived samples previously collected for Hg transport and deposition studies in the Great Lakes and South Florida regions. Precise measurements of lead isotope ratios were obtained from samples of precipitation with 0.50 - 3.00 ppb concentrations of Pb using the Plasma54 MC-ICPMS without Pb pre-concentration. Average ~(207)Pb/~(206)Pb and ~(208)Pb/~(206)Pb two a precision of .060 and .057%, respectively, was obtained with sample consumption of less than 1 ml. Average two a precision of ~(207)Pb/~(206)Pb and ~(208)Pb/~(206)Pb ratios obtained using conventional ICP-MS on the same samples was 0.58 and 0.95% respectively. Samples collected on a regional scale at rural sites in the Great Lakes area contained distinct Pb isotope and trace element signatures characteristic of smelter emissions in the U.S. and Canada. Samples were found to generally have more homogenized Pb isotope and trace element signatures when associated with air parcel transport from urban areas. Samples collected on a smaller spatial scale in urban areas in southeast Florida required high precision Pb isotope ratios obtained with MC-ICPMS to help define source contributions from emission sources such as power plants and waste incinerators. The further refinement of MC-ICPMS techniques has the potential to make precise Pb and other isotope ratio measurements from precipitation and aerosol samples an integral component of source apportionment studies.
机译：使用磁性扇区多集收集器ICP-MS技术（MC-ICPMS）开发了从含有低浓度Pb的沉淀样品获得Pb同位素比例的精确测量的方法。然后测定使用MC-ICPMS与常规ICP-MS获得的PB同位素比的准确度和精度的比较，以预先收集的用于HG运输和南佛罗里达地区的HG运输和沉积研究。使用血浆54MC-ICPM的沉淀物的沉淀样品获得精确测量铅同位素比，没有PB预浓度的沉淀。平均〜（207）Pb /〜（206）Pb和〜（208）Pb /〜（206）Pb两种精度分别为0.060和0.057％，采用小于1毫升的样品消耗。使用在同一样品上使用常规ICP-MS获得的〜（207）Pb /〜（206）Pb和〜（208）Pb /〜（206）Pb比率的平均两种精度分别为0.58和0.95％。在大湖区农村地区的区域规模收集的样本含有不同的Pb同位素和美国和加拿大冶炼厂排放的特征。发现样品在与城市地区的空气包运输相关时，通常具有更高均质的Pb同位素和微量元素签名。在佛罗里达州东南部的城市地区较小的空间尺度上收集的样本需要使用MC-ICPM获得的高精度PB同位素比率，以帮助确定来自发电源和垃圾焚烧炉等排放源的源贡献。 MC-ICPMS技术的进一步改进具有精确的Pb和其他同位素比测量从沉淀和气溶胶样品中的源分配研究的整体组分。

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