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i' <br /> v <br /> TECHIARTreport: 2123190 fo Pntt Consufling Company Page 2 <br /> PROCEDURE <br /> Samples were collected In the field using 40 ml glass vials(i.e., 'M,'vials with Teflon top septa). T�,vials were <br /> heated In a water bath to Lt least 50 Celsius. A sample of headspace gas was injected Into the Photovac and the <br /> analysis performed. Duplicate analyse were performed to check consistency of the chromatograms. <br /> RESULTS <br /> The check runs on the Photovac capillary column and the syringes prior to use were completely satlsfactory and <br /> showed that no contamination was present In the Instrument or an the syringes. <br /> The headspace analyses of headspace gas withdrawn fro +e vials all snowed the presence of methanol.' This <br /> substance Is a Mal-cleaning contaminant"rather than a shmple component. It was found In the headspace gas <br /> sampled from empty vials. The presence of this substance did not interfere in any way in the determination of the <br /> presence of benzene. toluene, ethylbenzene, xylene (collectively: BTEX), Total Petroleum zHydrocarbons- <br /> Gasoline(TPH-Casolfne), or Tota! Petroleum Hydrocarbons-Diesel (TPH-Diesel), since the methanol peak is In a <br /> region of the chromatogram which is separate from the peaks for BTEX, TPH-Gasoline or TPH•Dfesel peak <br /> locations. Since.the Instrument is run isothermally under close temperature control, there is minimal peak <br /> location drfft. . T <br /> f. <br /> k i <br /> i <br /> } <br /> 1 <br /> �a� <br />