Instrument - Gas Chromatograph - Flame Ionization Detector
Gas Chromatograph - Flame Ionization Detector
What is being measured:
Gas phase mono-functional and multifunctional compounds
Data recording software:
Agilent Chemstation 1.0
Data analysis software:
Manual Data Analysis
Raw data time resolution:
Analysis data averaging:
Sensitivity to temperature (and correction method, if applicable):
Sensitivity to relative humidity (and correction method, if applicable):
Thermal desorption of Tenax adsorbent cartridges
Sample preparation method:
Collection of known volume of gas over Tenax adsorbent cartridge at 250 cm3 min-1
Sample residence time (chamber to instrument) (seconds):
Length of tubing (cm):
Instrument flow rate:
Tubing inner diameter:
Chemical identification method:
Retention time matching of standards, Kovats retention index.
Data analysis method:
Integration of GC-FID peaks to get peak area. Peak area of compounds that do not undergo gas-wall partitioning are plotted to determine relationship of carbon number without gas-wall partitioning.
Peak areas are normalized to a compound in the experiment that does not undergo gas-wall partitioning to account for differences in sampling time and thermal desorption. Concentrations are determined by comparing to the peak area present at time zero and the concentration introduced into the chamber.
Calibration drift estimate:
Low (on the order of weeks)
Uncertainty estimation method:
Uncertainty is due to differences in sampling time (+/- 1%), variability in thermal desorption (+/- 3%) and other factors. Uncertainty is reduced by using an internal standard to account for these variabilities.
Link to supplemental information:
All measurements from this instrument have uncertainties of 5% of absolute value.
Output is normalized to initial concentration