Research on concentration retrieval of the SO2/Hg0 gas mixture

The paper researches on the concentration retrieval of the SO₂/Hg₀ gas mixture based on a continuum source, first using the DOAS (Differential Optical Absorption Spectroscopy) retrieves the concentration of SO₂ in the total absorbance, and then removes it and retrieves the concentration of Hg₀ using the way of concentration relationship curve. The result show that for the mixed gas, the retrieval error of SO₂ are less than 5%, however, the error of Hg₀ are more than 20%, and the less of the concentration, the greater of the error. So, the conclusion is that, when Hg₀ in such a low concentration condition, the existence of SO₂ will cause great interference, so must improve the algorithm to promote the retrieval precision.