MRI: Development of a LASER Sensor for the Measurement of Elemental and Reactive Gaseous Mercury

主要研究人员（PI）将开发一种新型激光传感器，用于检测气相元素汞、Hg（0）和活性气态汞（RGM）。该仪器将基于单个50 Hz Nd-Yag激光器，该激光器将用于泵浦两个紧凑型染料激光器。 PI的初步努力表明这种技术是可行的。 完成后，该仪器将能够测量气态元素汞，其时间分辨率和精度将允许使用涡流相关技术进行Hg（0）通量测量。 该仪器在配置为现场取样测量Hg（0）时，将达到与现有仪器相匹配的检测限，但时间要短得多。 时间分辨率和检测方法的这一改进为在飞机平台上测量Hg（0）提供了比当前方法更大的优势。 同样的仪器可以重新配置为与预扩散管一起操作，用于RGM的采样。 与目前的方法相比，它将有可能大大减少采样时间，并提供必要的时间分辨率的可能性，以获得良好解决的RGM日廓线。 它也显示了使用可编程的热分解/解吸从扩散器的RGM的形态的承诺。这种仪器将主要用于研究和研究培训，但它将被纳入教育活动，它将改善接触，并增加访问和使用，最先进的激光系统的科学家，研究生和本科生在迈阿密大学。 准确测量元素汞和活性气态汞的化学形态和沉积速率的能力对监管政策和美国《清洁空气汞规则》的实施具有重大意义。

The Principal Investigators (PIs) will develop a novel laser based sensor for the detection of gas phase elemental mercury, Hg(0),and reactive gaseous mercury (RGM). The instrument will be based on a single 50 Hz, Nd-Yag laser that will be used to pump two compact dye lasers. Preliminary efforts by the PIs have shown this technology to be feasible. Upon completion, the instrument will be capable of measuring gaseous elemental mercury with a temporal resolution and precision that will allow for Hg(0) flux measurements to be made using the eddy correlation technique. The instrument, when configured for in-situ sampling for measurement of Hg(0) will achieve detection limits which match those of current instrumentation but in a significantly shorter time period. This improvement in temporal resolution and the detection approach offer significant advantages over current approaches for measurement of Hg(0) on aircraft platforms. The same instrument can be reconfigured to operate with presampling on denuders for the sampling of RGM. It will be possible to significantly reduce sampling time compared with current approaches and offer the possibility of temporal resolution necessary to obtain well resolved diurnal profiles of RGM. It also shows promise for the speciation of RGM using programmable thermal decomposition/desorption from denuders. This instrumentation will be used primarily for research and research training but it will be integrated into educational activities and it will improve exposure to, and increase access and use of, state-of-the-art laser systems by scientists, graduate and undergraduate students at the University of Miami. The ability to accurately measure the chemical speciation and deposition rates of elemental and reactive gaseous mercury has major implications for regulatory policy and the implementation of the U.S. Clean Air Mercury Rule.