AI Article Synopsis

  • The paper examines how the internal diameter of transfer lines affects gas chromatographic separation efficiency and speed in analyzing mercury using multicapillary columns.
  • Five transfer line diameters (0.15, 0.20, 0.25, 0.32, and 0.53 mm) are compared, revealing that narrow diameters minimize peak dispersion while wider diameters lead to narrower peaks and quicker analysis times.
  • A thermodynamic model is proposed to explain analyte motion through the transfer line and column, showing a strong correlation with experimental results, particularly at high pressures and wider transfer lines.

Article Abstract

This paper reports the effect of transfer line (TL) internal diameter (i.d.) on gas chromatographic separation characteristics such as efficiency and speed, when a multicapillary (MC) column is used for speciation analysis of mercury. Five different TL consisting of fused-silica capillaries with 0.15, 0.20, 0.25, 0.32, and 0.53 mm i.d. are compared. The separation efficiency and total chromatographic run time are critically affected by the i.d. of the TL. Narrow capillaries (i.d.< or =0.20 mm) produce minimum peak dispersion whereas wide capillaries result in narrow peaks and shorter chromatographic analysis times. A thermodynamic approach is proposed to describe the motion of the analytes through the separation column and TL. The model provides good agreement with the experimental data for high pressures (> or =35 psig) and wide TL (> or =0.25 mm i.d.).

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http://dx.doi.org/10.1007/s00216-005-3297-yDOI Listing

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