光谱学与光谱分析, 2009, 29 (8): 2262, 网络出版: 2010-05-26  

单光路冷原子吸收法在线测量气态痕量汞的研究

Determination of Trace Hg Element in Gas by CVAAS with Single Optical Path
作者单位
1 哈尔滨工业大学能源科学与工程学院, 黑龙江 哈尔滨150001
2 哈尔滨工业大学物理系, 黑龙江 哈尔滨150001
摘要
建立单光路冷原子吸收在线测Hg小型实验装置, 应用Hydra AA全自动测Hg仪, 采用湿化学法测量吸收液中的Hg浓度, 通过测量结果计算出气体中的Hg浓度, 测量结果表明渗透管渗透速率稳定。 在此基础上, 根据Lambert-Beer定律, 通过原子吸收的方式测量痕量气态Hg的吸收强度, 并与湿化学法测得的结果进行对比分析, 实验结果与理论分析吻合较好, 表明单光路条件下, 冷原子吸收可用于纯净气体中Hg浓度的测量, 进一步的研究应当以如何提高系统适应性及抗干扰能力为主要方向, 光源强度的脉动可通过监测Hg的其他谱线来消除;外界环境的干扰, 例如气体中存在粉尘或吸收池镜片存在污染等, 可通过光电耦合变化作用予以消除。
Abstract
Since the anthropogenic emissions of mercury into environment were mostly entering the atmosphere through flue gas, continuous monitoring of mercury in the flue gas was significant for mercury emission control. A bench scale test rig was set up for the measurement of mercury through both wet chemical method and CVAAS (cold vapor atomic absorption spectrometry) with single optical path. The concentration of Hg in absorbent solution was determined by Hydra AA mercury analyzer. The concentration of Hg in gas was calculated in terms of wet chemical testing results, which showed a stable rate of permeation device. Hg atom absorption signal intensity was detected and analyzed in comparison with the test results of wet chemical methods according to Beer-Lambert law. Experimental data well agreed with the theory analysis, which indicated that the single optical path was suitable for the determination of trace Hg element in pure gas. Further research work should aim at the improvement of system adaptability and anti-jamming ability. To reduce the intensity fluctuation of mercury lamp, another spectral line could be detected simultaneously. Interference from surroundings, e.g. dust in gas or spot on the quartz surface, could be eliminated by optoelectronic coupling.

王帅, 王鹏, 汪细河, 高继慧, 张治国, 吴少华. 单光路冷原子吸收法在线测量气态痕量汞的研究[J]. 光谱学与光谱分析, 2009, 29(8): 2262. WANG Shuai, WANG Peng, WANG Xi-he, GAO Ji-hui, ZHANG Zhi-guo, WU Shao-hua. Determination of Trace Hg Element in Gas by CVAAS with Single Optical Path[J]. Spectroscopy and Spectral Analysis, 2009, 29(8): 2262.

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