Abstract：Using low-pressure mercury lamp as light source, combined with the monochromator, the consistency of mercury calibration by mercury permeation tube method and mercury saturated vapor method was studied. In the mercury permeation tube experiment, the Pearson correlation coefficient between the absorption area value and the theoretical concentration was 0.9968, and the goodness of fit was 0.9936, indicating that the two groups of data were well correlated and in accordance with Lamberbeers law. Taking the absorption cross section of the experiment as the standard reference absorption cross section, it was found that the maximum concentration error was 7.45% for horizontal comparison of mercury vapor with the same concentration and vertical comparison of mercury vapor with different concentration. The above results showed that the permeation tube method is feasible, stable and accurate. When SO2 was added to the permeation tube experiment, the maximum measurement error of gaseous mercury concentration was 12.82%, indicating that SO2 interfered with the measurement of mercury absorption degree to a certain extent. In the experiment of mercury saturated vapor method, the maximum error measured with the permeation tube as the reference was within the allowable error of the standard, indicating that the two calibration methods were consistent. However, compared with the permeation tube method, the repeatability and accuracy of the mercury saturated vapor method were still insufficient, and there was a large room for improvement.
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2022, Vol. 43 
