Friday 7 February 2014

METHOD

Standard Preparation:
1) Weight a quantity of propylene .
2) Dilute it with methanol.
(Concentration approximately 150.0mg/ml) Dilute to 74.9 to 1497.8µg/ml

Sample Preparation:
Sample collected using a sampling pump and OVS-7 tubes.
1) Front and back section of each sample tube are placed in separate 4ml Vials.
2) Desorbed with 2ml of methanol.
3) Seal vials and desorb for one hour on mechanical rotator.
4) Transfer to smaller vials for autosampler.


1. Inject 1µl of standard in separate runs. Dry tips before injection.
2. Wash syringe after each injection. Dry tip before taking the next sample.

3. Inject 1µl of the analyte that contain many compounds.
4. Record retention times of peaks. Compare the retention time of the analyte with the standards to identify the presence of Propylene Glycol. (Tentative identification)
5. For spiking: Using a dropper, add in additional drops of unknown sample into suspected standard.
    Mix. Inject 1
µl of the mixutre into the GLC.
6. Peak enhancement occurs, unknown contain suspected standard.


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