Short name:
GC_FID_WallLoss

Full name:
Gas Chromatograph - Flame Ionization Detector

What is being measured:
Gas phase mono-functional and multifunctional compounds

Sampling Protocol:
Offline

Manufacturer:
Hewlett Packard

Model:
6890

Instrument year :
None specified

Data recording software:
Agilent Chemstation 1.0

Data analysis software:
Manual Data Analysis

Raw data time resolution:
1 Hz

Analysis data averaging:

Detection limit:
1 ppb

Sensitivity to temperature (and correction method, if applicable): :
N/A

Sensitivity to relative humidity (and correction method, if applicable): :
N/A

Sampling method:
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:

Tubing material:

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.

Quantification method:
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 method:

Calibration drift estimate:
Low (on the order of weeks)

Calibration schedule:
As Needed

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.

Known interferences:

Link to supplemental information:

Additional notes:

Measurement uncertainty:
All measurements from this instrument have uncertainties of 5% of absolute value.

Measurement units:
Output is normalized to initial concentration