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Page <br /> For general mineral analysis, the anion and cation balances should be <br /> r`u`1 determined. If the difference is more than 0.3 meq/L or 5% (whichever is <br /> greater), the analysis should be rechecked. <br /> For CC/MS analyses, the overall precision and accuracy of recovery is <br /> monitored by the addition of surrogate standards to every sample,' <br /> XI. Corrective Action in Out-of-Control Situations <br /> The results obtained from the duplicate and the spiked samples should be <br /> within the acceptance limits. In the event of an ouc--of-control <br /> situation, the following (in order) should be investigated: <br /> 1). Check for errors in calculation <br /> 2). Check calibration and instrument performance. Prepare new <br /> standards if necessary, <br /> 3). Reanalyze, if possible, the duplicate or spiked sample. <br /> (prepare a new spiked sample if necessary). <br /> If there j!s insuffi•,ient sample for reanalysis, an alternate sample from <br /> the set may be analyzed as either a duplicate or a spiked sample, <br /> A brief explanation identifying the probable cause of the out-of-control <br /> situation should be included with the data. If matrix interference is <br /> cited in this explanation, the results sent to the client should state <br /> that matrix interference was observed (and the reported detection limit <br /> may also be increased), <br /> i <br /> XII. Analytical review <br /> Analytical results are recorded to show the date on which the data was <br /> j obtained and the analyst r,,spo:+sible for the data. Precision r,nd <br /> accuracy data are plotted un quality control charts prior to releasf. of <br /> the results. The taboratary Director is responsible for the quality of <br /> the data reported. <br /> XIII. Maintenance and Repair of Instruments <br /> Routine maintenance of :quipment is performed by the analyst when <br /> appropriate. Instrument maintenance a:,d calibration is performed by <br /> qualified service technicians (usually service representatives of the <br /> Instrument manufacturer). Instrument repair is also performed by these <br /> technicians and a record <br /> (containing the date, the nature of the problem, <br /> description of the repair, and the name of the technician) is also kept. <br /> RECEIVED NAR 1 3 1990 <br />