Laserfiche WebLink
SOP TO-14A/15 <br /> Rev 4 <br /> December 2007 <br /> ' preventive maintenance does not of itself produce poor quality data,the lack of such procedures may lead to <br /> earlier degradation of data and slower processing of samples. <br /> ' This section treats PM in two sections: preparation and instrument PM. <br /> 12.1.1 Preparation PM <br /> The primary area where preventable errors can enter throughout the preparation steps <br /> is the introduction of contamination. Preventive maintenance in the preparation steps <br /> ' primarily consists of thorough cleaning of canisters, glass syringes and other <br /> apparatus. <br /> ' 12.1.2 Instrument PM <br /> There are five pieces of instrumentation involved in the analysis of volatile organics <br /> ' by GC/MS. They are the following: <br /> (1)the Mass Spectrometer <br /> ' (2)the Gas Chromatograph <br /> (3)the Entech concentrator <br /> (4)the Entech Autosampler <br /> (5)the computer system <br /> H&P follows the manufacturer's recommendations on mass spectrometer PM. <br /> ' Monitoring and changing rough and diffusion pump oil and cleaning of source are <br /> performed at regular intervals. A full stock of parts are kept in the lab including but <br /> not limited to source filaments and cleaning apparatus. <br /> ' Gas Chromatograph PM consists primarily of maintaining a full stock of consumable <br /> parts. Swagelok nuts, ferrules, septa, etc. allow the operator to repair, change worn <br /> ' parts quickly and to continue operation without loss of time. Tubing should be <br /> periodically inspected for cracks and possible leaks. Monitoring of the gas levels and <br /> rate of pressure loss may help discover problems. <br /> ' The concentrator can be monitored for leaks using a leak test program of the <br /> manufacturer. The tenax trap usually needs to be replaced every 6 months. <br /> ' Autosampler(AS) PM is mainly concerned with cleanliness of the system and the <br /> checking of leaks. Following high level samples and standards it is desirable to run a <br /> blank through the AS. <br /> ' The Computer system PM consists of keeping dust and dirt out of the components and <br /> backing up the data and methods as often as possible. <br /> ' 13.0 Data Acquisition Calculation and Data Reduction <br /> ' Page 11 of 24 <br />