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- Title
Determination of Sulphur-Based Odourants in Commercially Available Natural Gas with Flow-Modulated Comprehensive Two-Dimensional Gas Chromatography.
- Authors
Hayward, Taylor; Gras, Ronda; Luong, Jim
- Abstract
Alkyl mercaptans, alkyl sulphides, and cyclic sulphides are added in various blends to commercial natural gas as a safety precaution to identify its presence by smell. Although several different analytical methods exist to measure these compounds, few are all-encompassing techniques that can measure all the sulphur compounds simultaneously at appropriate levels. Pulsed-flowmodulated comprehensive two-dimensional gas chromatography with flame ionization detection was used to separate and identify all common sulphur compounds found in natural gas. The column set used in this method consisted of a polydimethylsiloxane-like stationary-phase selectivity in the first dimension with a low-bleed wax stationary phase in the second dimension. This set was optimized to separate key sulphur compounds found in natural gas from this hydrocarbon matrix. Detection limits of this method were determined to be 0.1 ppm (v/v), and a linear calibration range spanning from 0.1 ppm to 30 ppm (v/v) was used to perform quantitative analysis on a residential natural gas supply. Reproducibility of peak volume of seven successive injections on these test analytes averaged 3.7%.
- Subjects
NATURAL gas production; NATURAL gas prospecting; CHROMATOGRAPHIC analysis; INDUSTRIAL gases; POISONOUS gases; AERODYNAMICS
- Publication
LC-GC Europe, 2014, Vol 27, Issue 1, p8
- ISSN
1471-6577
- Publication type
Article