Abstract：Based on X-ray fluorescence spectrometry(XRF), a set of on-line analysis instrument for heavy metal Pb in flue gas was constructed by combining with the isokinetic sampling principle. The on-line analysis method of heavy metal in flue gas was established. The flue gas was sampled according to isokinetic sampling principle. The metals were enriched on the special filtration membrane. Then, the enriched sample was transferred into analysis region through roll film system. The X-ray fluorescence spectrometric determination results were recorded. The determination conditions of standard membrane for Pb were optimized to make sure that the linear correlation coefficient (R2) of calibration curve was higher than 0.9. The optimized determination time and enriching time was 400 s and 30 min, respectively. Meanwhile, the determination results were compared with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The correlation between two methods was 0.93, which further proved the accuracy of the proposed method. Finally, the on-site sampling parameters were optimized. The concentration change of heavy metal in flue gas from power plant was monitored within a period of time. The on-line monitoring requirements in time resolution could be satisfied.
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