• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Analytical chemistry >Analysis of Crystalline Silica Aerosol Using Portable Raman Spectrometry: Feasibility of Near Real-Time Measurement
【24h】

Analysis of Crystalline Silica Aerosol Using Portable Raman Spectrometry: Feasibility of Near Real-Time Measurement

机译：采用便携式拉曼光谱分析晶体二氧化硅气溶胶：近实时测量的可行性

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 Raman spectroscopy based method has been developed for measurement of trace airborne concentrations of respirable crystalline silica (RCS) using various aerosol sampling and analysis techniques. Three aerosol microconcentration techniques were investigated for effective coupling of collected particulate samples with micro-Raman spectroscopy: (i) direct analysis on a particulate filter after focused aerosol collection using a converging nozzle; (ii) analysis of dried particulate deposit on a filter obtained directly from the aerosol phase using the Spotsampler device; and (iii) analysis of a dried spot (?1–3 mm diameter) obtained by redepositing the particulate sample, after low-temperature plasma ashing of the filter sample. The deposition characteristics (i.e., spot diameter, shape, and deposit uniformity) of each technique were investigated. Calibration curves were constructed and detection limits were estimated for α-quartz using the A _(1) Raman Si–O–Si stretching–bending phonon mode at 465 cm~(–1). The measurement sensitivity could be substantially improved by increasing the signal integration time and by reducing the particle deposition area. Detection limits in the range of 8–55 ng could be achieved by microconcentrating the aerosol sample over a spot measuring 400–1000 μm in diameter. These detection limits were two to three orders of magnitude lower compared to those attainable using current standardized X-ray diffraction and infrared spectroscopy methods. The low detection limits suggest that near real-time measurements of RCS could be achieved with limits of quantification ranging from 2 to 18.5 μg/m~(3) (at 10 min collection time and 1.2 L/min sampling flow rate), depending on microconcentration technique used. The method was successfully extended to the measurement of α-quartz air concentration in representative workplace aerosol samples. This study demonstrates the potential of portable micro-Raman spectroscopy for near-real time measurement of trace RCS in air.
机译：已经开发了基于拉曼光谱的方法，用于使用各种气溶胶采样和分析技术测量痕量空气传播浓度的可吸入的结晶二氧化硅（RCS）。研究了三种气溶胶微核浓缩技术，用于将收集的颗粒样品与微拉曼光谱有效偶联：（i）使用趋同喷嘴聚焦气溶胶收集后的微粒过滤器直接分析; （ii）使用光点采样器装置直接从气溶胶相直接获得的过滤器上的干燥颗粒沉积物的分析; （iii）通过在过滤样品的低温等离子体灰化后通过重新停养颗粒样品而获得干燥点（α1-3mm直径）。研究了每种技术的沉积特征（即，光斑直径，形状和沉积物均匀性）。构造校准曲线，并且使用在465cm〜（-1）的 _（1）拉曼Si-O-Si-Si-O-Si拉伸声子模式估计α-石英的检测限制。通过增加信号积分时间并通过减小粒子沉积区域可以基本上提高测量灵敏度。通过在直径400-1000μm的斑点上微细胞微肠样品来实现8-55 ng范围内的检测限。与使用电流标准化的X射线衍射和红外光谱法相比，这些检测限相比，这些检测限相比降低了两到三个数量级。低检测限表明，可以通过2至18.5μg/ m〜（3）的定量限制来实现RCS的近实时测量（在10分钟收集时间和1.2L / min采样流量），具体取决于使用微核浓缩技术。该方法成功地扩展到代表性工作场所气溶胶样品中α-石英空气浓度的测量。该研究表明便携式微拉曼光谱的潜力，用于近实时测量空气中的痕量RC。

著录项

  • 来源
    《Analytical chemistry》 |2018年第10期|共11页
  • 作者

    Lina Zheng; Pramod Kulkarni; M. Eileen Birch; Kevin Ashley; Shijun Wei;

  • 作者单位

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Cincinnati Ohio 45226 United States;

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Cincinnati Ohio 45226 United States;

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Cincinnati Ohio 45226 United States;

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Cincinnati Ohio 45226 United States;

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Cincinnati Ohio 45226 United States;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分析化学;
  • 关键词

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