中文摘要：

介绍了中美两国法规对汞排放连续监测的要求，分析了烟气中汞排放连续监测的技术难点，指出现有的汞在线监测只能得到气态总汞的浓度。阐述了冷蒸气原子吸收光谱法、塞曼调制原子吸收光谱法、冷蒸气原子荧光法、原子发射光谱法、紫外差分吸收光谱法等气态元素汞的不同分析方法。通过对湿化学法与热转化单元的比较，得出热转化技术更加适合烟气汞的在线监测。分析了造成汞测量误差的相关因素，并提出了减少误差的措施。

英文摘要：

The requirements of Chinese and the United States regulations for mercury emissions monitoring were described. The key technical difficulties were analyzed for the mercury continuous emission monitoring and on-line monitoring for mercury only got the concentration of total gas-phase mercury. The different analytical methods for the gaseous elemental mercury were showed such as cold vapor atomic absorption spectrometry, Zeeman modulated atomic absorption spectrometry, cold vapor atomic fluorescence spectrometry, atomic emission spectrometry and UV-DOAS. By comparing wet-chemistry with thermal conversion method, the thermal conversion technology was more suitable for Hg CEMS than other methods. The relative factors of mercury detecting error were analyzed for the measurements to reduce the error.