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� � 4 <br /> � <br /> rte .,, <br />'r <br /> z <br /> SHERWOOD LASS CORPORATION <br /> Quality Control Program <br /> Page : 3 <br /> c. 10% of all samples analyzed are standards. Reproducibility <br /> of equivalent atandards for a sample batch is maintained <br /> within +/- 10% of the initial standard injection value. <br /> Failure to meet this requirement will result in the re- <br /> running of the affected sample batch. <br /> d. 10% of all samples shall be chosen at random for <br /> preparation as matrix spike/matrix spike duplicates. <br /> Spiked samples are included with the associated sample <br /> } <br /> batch or within 24 hours of analyzing the original samples. <br /> Recoveries for all spike samples are tabulated to determine <br /> average (R) and the standard deviation (STD) determined <br /> j using the results of at least 30 analyses. Recoveries are <br /> matrix dependent. Acceptable recovery limits are <br /> established for each matrix of interest and are based on <br /> R +/- 3 STD for establishing control limits (UCL and LCL ) . <br /> e. All samples and blanks are spiked with a compound(s) other <br /> than the analytefs) of interest to monitor the analytical <br /> procedure. Recoveries are determined and accounted for <br /> when the analytical data is compiled. <br /> 3. COLUMN PERFORMANCE <br /> New columns are qualified by evaluating standard solutions <br /> supplied by equipment and column manufacturers and calibration <br /> and control standards prepared in the laboratory. An ongoing <br /> program for evaluation of column performance includes <br /> monitoring of the following parameters: <br /> a. Fabulation of standard peaks(s) retention times (windows). <br /> b. Visual monitoring of standards for evalua =nn of peak(s) <br /> resolution. <br /> G <br /> In the event that problems are detected than can be related. to <br /> the column the integrity of other instrument components <br /> including detector response, instrument gases and fittings are <br /> y examined. Failure to identify a problem with these other <br /> areas will result in the replacement of the column and <br /> initiation of the column qualification scheme. <br /> Y <br />