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Project Plan <br />Revision 6 <br />1/8/1988 <br />Page 14 of 37 <br />calibration curve for each analyte. The intensity of Absorbance are <br />checked on the following instruments: AA, IR, ICP, W, and optimized before <br />calibration. Our present AA and ICP are capable of doing calibration <br />automatically and standard curves are not manually drawn. Calibration <br />check samples are run every ten samples and at the end of every batch. <br />All other instruments such as pH meter, conductivity meter will be <br />checked and or standardized before samples are run with two levels of check <br />standards. Instruments will be checked every 24 hours of use to assure the <br />instruments are calibrated. <br />5.1.3 §aS3le Preparation <br />5.1.3.1 Blank <br />One Method Blankshould be run for every analytical batch where an <br />analytical batch is defined as samples which are analyzed together with the <br />same method sequence and the same lot of reagents as well as having similar <br />composition to asssure no contamination from laboratory environment and <br />glassware. If any target compounds are found in the blank, the source of <br />contamination should be identified and eliminated before repeating the <br />' analysis. <br />5.1.3.2 Check Sample (_Reagent S ike <br />At least on check sample (reagent spike) should be run on the day when <br />the method is used. The percent recovery of analytes from check sample <br />should be used to monitor the extraction procedure. If the analyte <br />recovery is outside the control limits, the problem should be identified <br />' <br />and sol re solved before eating the analysis. <br />P <br />5.1.3.3 Matrix Spike <br />� <br />20 <br />