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• <br /> a Replicates and Spiked Samples <br /> Each specific method SOP includes the requirements for the <br /> analysis of replicates, matrix spikes/matrix spike duplicates <br /> CMS/MSO), and blank spikes CELS) for that method . in addition. <br /> the particular requirements of the individual client also govern <br /> the analysis of replicates and matrix spikes . The analysis of <br /> replicates and matrix spikes includes, but is not limited to, <br /> the following general considerations . <br /> o Replicatess <br /> a Replicates are only analyzed when they are <br /> specifically requested or required by the individual <br /> client or method . <br /> o Spiked Samples% <br /> o Rn HSIMSD pair, and a BLS, are prepared at a <br /> frequency of 10% of the incoming samples, by method <br /> and matrix. <br /> o Rn HS (matrix spike) represents the spiking of a <br /> sample with a known amount of target analyte(s) . <br /> o Rn HSG (matrix spike duplicate) represents a <br /> duplicate of the HS, using the same sample. <br /> a R BLS (blank spike) represents the spiking of a <br /> blank with a known amount of target analyte(s) . <br /> o Rn MS/MSG pair is analyzed per extraction batch or <br /> every 20 samples, per matrix, whichever is more <br /> frequent . <br /> o If the MS/MSO fails to meet the quality <br /> acceptance criteria, the BLS is also analyzed to <br /> demonstrate that the system is in control . <br /> 14 <br />