Method
Gas chromatograph:
Kristall 2000M or Chromatec-Crystal 5000/9000
Detector:
FID
Capillary column:
HP-PLOT Q column, 30 m × 0.53 mm
Injection system:
Liquefied gas sampling valve with an injection volume from 0.05 to 1 µL
Chromatographic data processing software:
Chromatec Liquefied Gas
Additional equipment:
Hydrogen generator
Air compressor
Gas fittings kit 4.078.000
Sampling cylinders:
PGO and PU sampling cylinders according to GOST 14921
PP-150 constant-pressure sampling cylinders (recommended)
Gas fittings kit 4.078.008 for filling piston sampling cylinders
Filters for gas sampling and sample injection (filter 5.884.057, filter 5.884.083, filter 5.884.056)
Method Description
Method B of GOST R 54484 is used for the determination of methanol content in LPG samples.
The method is also applied for determining the component composition of LPG that does not contain unsaturated hydrocarbons, or in cases where the content of unsaturated hydrocarbons in the LPG composition is not regulated.
Methanol is determined by this method in the range from 0.001% to 0.01%.
When selecting a column, it should be taken into account that PLOT Q columns tend to produce significant peak tailing. Both high- and low-concentration peaks may show tailing, so in some cases it may be more practical to use a packed column with HayeSep Q (Porapak Q).
Calculation of the component composition, density, and saturated vapor pressure of liquefied gas is performed using the Chromatec Liquefied Gas software.