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n <br />N , <br />6 a.e t. n <br />c Of c <br />If significant variations (greater than two standard deviations <br />from the mean of previous determir,ations) are observed in the <br />calibration responses, the system is considered to have failed <br />celit,ration. After calibratic faiIuse, tr!e procec;r®s fpr <br />initial caIitration must be fCowed to de!nonstrate set, sfactory <br />;tri c•'Rance. <br />n :t -zn.ca rn;xture s run prior to eralyses ea -- n c a y to establish <br />tha: the sensitivity c,f the irstrurrient has not altered from the <br />,previous calibration. Data generated in this manner i5 compared <br />acar:s: cumulative :ata to e s t a sh treat instrument response is <br />stable to within tap standard deviations of the mean of --rev;Ous <br />determinations. If this calibration mixture fails, the :rocedure <br />for realibraticn -.ust be fcilowed . Anaiyaes which are not <br />performed regularly will use the calibration procedures each time <br />t^ey are run. <br />