Summary
The blanks in preconcentration methods for determining trace amounts of impurities in ultra-pure gases, which include the preconcentration volume of sample gases, carrier gas impurities and atmospheric contamination are discussed and three concentration methods for eliminating blank errors are proposed. These are, the differential volume method by concentrating at the same flow-rate but different times (DVMSF), the differential time method by concentrating the same volumes at different flow-rates (DTMSV) and the differential volume method by concentrating for the same times but different flow-rates (DVMST). DVMST is proposed as the best method for its ability to eliminate all blank errors described. The methods are used to determine trace amounts of Ar+O2 and N2 in ultra-pure hydrogen. Calculations demonstrate that the methods can effectively improve analytical accuracy.
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Wu, L.X., He, H.N. Improvements in preconcentration methods for determining trace impurities in ultra-pure gases by gas chromatography. Chromatographia 35, 339–343 (1993). https://doi.org/10.1007/BF02277521
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DOI: https://doi.org/10.1007/BF02277521