烟气中微量重金属元素的快速精确测量是实现污染排放控制的基本前提。本项目选择具备实现微量重金属快速精确在线分析潜力的激光诱导击穿光谱技术为研究对象，从复杂气体背景中微量重金属等离子体的发射光谱特性出发，首先测量纯净氮气环境中微量汞和砷等元素的原子发射光谱，分析待测元素在不同激发条件时的特征谱线特性；进而开展烟气环境中微量重金属的激光诱导等离子体发射光谱特性研究，重点分析烟气等离子体的发射光谱中待测元素特征谱线信噪比的影响因素和变化规律，揭示激光诱导气体等离子体中待测元素信号和干扰信号的产生机理，获得提高烟气中微量重金属元素检测精度的策略和方法；探寻影响发射光谱强度的等离子体物理特性参数及其影响规律，根据元素浓度与对应光谱强度的关系，建立待测元素浓度与待测元素谱线参数和激发条件的定量计算模型。为LIBS技术的精确在线监测提供理论和实验基础以及有力的工业指导，具有重要的学术意义和实用价值。

The pollutions of trace heavy metals in flue gas result in the serious influence on environment and human. The prerequisite for the effect of pollution control is the fast and precise measurement of pollutants. Laser-induced breakdown spectroscopy(LIBS) has been employed in this study, which has a great potential application for on-line measurement of trace heavy metals. The atomic spectra features of trace heavy metals will be studied in complex background. The spectra of elements mercury and arsenic in N2 will be firstly studied under different experimental conditions. According to the measured results, the spectra of detected elements in flue gas will be discussed, especially the signal emission intensity and the signal to noise ratio, to understand the mechanism for plasma generation and emission. Therefore, the detection method will be improved to enhance the detection ability of trace heavy metals. The concentration of detected elements can be evaluated according to the signal emission intensity, which is effected by the physical parameters of the generated plasma. The quantitative calculation method of the concentration and analyte spectral parameters, as well as experimental conditions, will be presented according to the theoretical analysis results. These theoretical and experimental results will be useful for LIBS applications of trace heavy metal pollutions in real time. These works show great academic significance and applicable potential.