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SOP TO-14A/15 <br /> Rev 4 <br /> December 2007 <br /> Once the system has been turned on, the daily calibration checked and a blank analyzed, samples and <br /> QA/QC samples may be analyzed. <br /> ' 13.1 System Start-Up - Mobile labs <br /> ' In the mobile laboratories the mass spectrometer is maintained heated and under vacuum through the use of <br /> the inverter/battery system, generator or shore power. The gas chromatograph must also be maintained on to <br /> provide heat to the transfer line. Helium is always supplied to the gas chromatograph but is automatically <br /> shut off when the GC is off through the electronic pressure control. <br /> Upon leaving the garage: <br /> ' 1. Start the generators and wait for the delay period to ensure that the system is running on AC. <br /> Fill out excursion log. <br /> ' 2. Start air conditioners if needed. <br /> 3. Make sure all equipment has transitioned to generator power successfully. <br /> 4. Check the vacuum status. Diff. pump should be hot, MS should be at temperature (230 <br /> source, 150 analyzer for the 5973A) and foreline pressure around 120 mm when 3.0 ml/min <br /> is supplier by the GC to the column. <br /> 13.2 Daily Calibration and Blank Analysis <br /> 1 1. Load the method files on concentrator and GC-MS. Use sequencing for multiple GC-MS <br /> analyses. Use scheduling to run multiple samples. <br /> 2. Standard Analysis <br /> ' Analyzed a standard equilvalent to 20 ppbv in a 50 ml sample using 100 mL of the l Oppbv of <br /> standard mix and 50 ml of I.S/surr. Mix. All targets must be within specifications of the <br /> method (generally less than 30%deviation in the RRF F em the expected i4l*e)with e <br /> ' exee 44O°o. . If they are not, a second calibration can be analyzed. The internal <br /> standard responses must be within 40% of the mean area response of the IS in the most <br /> recent calibration. The relative retention time(RRT) for each internal standard must <br /> ' be within 0.33 minutes compared to the RRT of the internal standard from the most <br /> recent calibration. <br /> If the second calibration does not meet calibration specifications, troubleshooting may take <br /> ' place and subsequent calibrations attempted. For NELAC certified work, one must achieve <br /> two consecutive passing daily calibration prior to processing samples. <br /> 3. Analysis of blank air <br /> ' Page 12 of 24 <br /> 1 <br />