GCS-CEAS: a novel tool for exposure assessment during disaster response

GCS-CEAS:灾难响应期间暴露评估的新工具

基本信息

  • 批准号:
    10699942
  • 负责人:
  • 金额:
    $ 20.49万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2023
  • 资助国家:
    美国
  • 起止时间:
    2023-05-01 至 2024-04-30
  • 项目状态:
    已结题

项目摘要

BRI will develop and demonstrate a Gas Chromatography Selector (GCS) that front-ends a Cavity Enhanced Absorption Spectrometer (CEAS) for the fast, accurate, selective, sensitive (0.025 ppbv, or better, using pre- concentration) measurement of a wide spectrum of volatile organic hydrocarbons (VOHs) that are beyond current CEAS technology. BRI will develop and demonstrate an inexpensive, reusable Pre-concentration Sample Module (PSM) to collect samples for later analysis. Thus GCS-CEAS significantly extends industry- leading CEAS technology capabilities for air quality monitoring opening many new applications. GCS-CEAS will be suitable for mobile applications with a time response comparable to or better than other gas analyzers (1-2 minutes). Extreme weather events are increasing instances of cascading technological disasters, e.g., hurricanes damage infrastructure, causing chemical releases, and thus, exposure. GCS-CEAS addresses the resulting VOHs released and can be expanded to include any gas that can be measured by gas chromatography. Thus, GCS-CEAS supports disaster response as a reliable, accurate sensor that detects an extensive range of toxic gases for exposure assessment for first responders and the community. The GCS-CEAS uses fast (0.1-2 s time response) analysis by the CEAS of CH4 to guide GCS-CEAS data collection or PSM collection for later analysis. GCS-CEAS can be adapted easily to other VOHs of interest. Envisioned mobile applications are for cars, a 4WD vehicles, or small ATVs. There are direct health applications: exposure, breath analysis, diagnostics, or monitoring exhaled anesthetic. GCS-CEAS will be commercially accessible, requiring minimal technical expertise, maintenance, and calibration. Fusion of mobile real-time, focused speciation by GCS-CEAS with archival full speciation will transform source monitoring. GCS-CEAS enables in-plume sample collection that stationary monitors can easily miss or misinterpret to estimate exposure. Mobile data are snapshot data that removes the large uncertainty in stationary datasets wherein transport processes and emission unsteadiness become confounded. We demonstrate field application of GCS-CEAS using remote PSM sample collection downwind of the Carson Refinery for complete analysis by the bench top system. Tasks involve developing and validating optimization modules to meet target time response, accuracy, selectivity, and detection limits and accounting for H2 balance effects on CEAS calibration. Target GCS-CEAS accuracy is 5%. PSM target detection limits are sub-25 ppt at 1-3 minute time response for BTEX and alkanes, similar to fluorescence analyzer time-scales, which only measure (selectively) one (not large molecule) gas per analyzer and cannot be re-tasked for other gases, unlike the GCS-CEAS.
BRI将开发和演示一种气相色谱分析仪(GCS), 吸收光谱仪(CEAS)用于快速,准确,选择性,灵敏度(0.025 ppbv或更好,使用前 挥发性有机碳氢化合物(VOH)的广谱测量, 目前的CEAS技术。BRI将开发和展示一种廉价,可重复使用的预浓缩 样品模块(PSM),用于收集样品以供后续分析。因此,GCS-CEAS大大扩展了行业- 领先的CEAS空气质量监测技术能力开启了许多新的应用。 GCS-CEAS将适用于移动的应用,其时间响应与其他应用相当或更好 气体分析仪(1-2分钟)。极端天气事件正在增加级联技术的实例 灾难,例如,飓风破坏了基础设施,造成化学品泄漏,从而造成接触。公司简介 解决了由此产生的挥发性有机物释放,并可以扩展到包括任何气体,可以通过气体测量 层析因此,GCS-CEAS作为一种可靠、准确的传感器, 广泛的有毒气体,用于第一反应者和社区的接触评估。 GCS-CEAS使用CH 4 CEAS的快速(0.1-2 s时间响应)分析来指导GCS-CEAS数据 收集或PSM收集,以供以后分析。GCS-CEAS可以很容易地适应其他感兴趣的VOH。 设想的移动的应用是用于汽车、四轮驱动车辆或小型ATV。有直接的健康 应用:暴露、呼吸分析、诊断或监测呼出的麻醉剂。GCS-CEAS将 商业上可获得的,需要最少的技术专长、维护和校准。 通过GCS-CEAS进行的移动的实时、集中的物种形成与存档的完整物种形成的融合将改变 源监测。GCS-CEAS能够进行固定监测器很容易错过或 错误解读来估计暴露量移动的数据是快照数据,它消除了 其中传输过程和排放不稳定性变得混淆的静态数据集。 我们展示了GCS-CEAS的现场应用,使用远程PSM样品采集, 卡森炼油厂通过台式系统进行完整分析。任务包括开发和验证 优化模块,以满足目标时间响应,准确性,选择性,检测限和会计 H2平衡对CEAS校准的影响。目标GCS-CEAS准确度为5%。PSM目标检测限为 对于BTEX和烷烃,在1-3分钟的时间响应下低于25 ppt,类似于荧光分析仪的时间尺度, 其每个分析仪仅(选择性地)测量一种(非大分子)气体, 气体,不像GCS-CEAS。

项目成果

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