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Inoreanic Data Reportine Ouaiifiers <br />The following qualifiers are used by the laboratory when reporting results of inorganic <br />analyses. <br />• Concentration qualifier -- If the analyte was analyzed for but not detected a "U" is <br />entered. <br />• QC qualifier -- Specified entries and their meanings are as follows: <br />N - Spiked sample recovery not within control limits. <br />Duplicate analysis (relative percent difference) not within control limits. <br />Z - Calibration spike recovery not within control limits. <br />4 <br />