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Section No: 11 <br />Revision No: 2.0 <br />Date: January 15, 1994 <br />Page: 2 of 18 <br />Internal Quality Control <br />11.1.2.3 Initial Calibration Verification (ICV) <br />ICV is used as an independent verification of the calibration. EPA protocol <br />recommends analysis of ICV for each analytical calibration. ICV samples are <br />manufacturer or laboratory prepared from independent suitable reference <br />standards. The ICV usually contains the analytes of interest at a concentration <br />in the 'd -calibration range. Methods 'fic acceptance criteria are used when <br />possible. When method s ° cc criteria are unavailable, the recoveries are <br />control charted to obtain . <br />Continuing Calr Ir Verification <br />CCV is .1 to verify continuing W Y rt r EPA methods rer - <br />analysisof on a per batch or per day basis. CCV samples. <br />manufacturer r t or laboratory prepared r r r suitablereference standards. r <br />standard rr or may r be rLr./ r e 1 of calibration str o/ Y The <br />contains tranalytesof interestrr i r a: in themid <br />- <br />calibration ra r r< specific acceptanceused when possible. <br />When methodspecific criteria are unavailablecontrol <br />charted <br />1 obtain rr <br />11.1.2.5 Internal Standards <br />An IS is a syntheticcompound r occuring in an environmental sample but has <br />chemical behavior similar to that of the target analytes. EPA protocol requires <br />IS for rmethods on a /. sampler(includingQC samples).The <br />serves as a check on the analysisand corrects forrr <br />effects. <br />Method <br />,11specificacceptance 1: possible. <br />i.. 1 ::. r.: <br />method r i r:ecriteria are unavailablerecoveries control is to <br />obtain yry,ptance limits. <br />11.1.3 Method Quality Controls <br />11.1.3.1 Method Blank <br />The method blank is used to ensure that any positive results were not because of <br />reagent or labware contamination. Before analyzing any samples, the analyst <br />must demonstrate throw the analysis of a method blank, that all glassware and <br />reagents are free of contaminants. Each time a set of samples is extracted, a <br />method blank must be processed to check for laboratory contamination. The <br />blank samples should be carried through all stages of the sample preparation and <br />analysis. Lack of contamination is demonstrated if all target analytes with the <br />exception of common laboratory reagents are below their DLRs. <br />11.1.3.2 Laboratory Control Sample (LCS) <br />The LCS is used to verify overaH accuracy of the method. EPA protocol requires <br />analysis of an LCS for each analytical batch when appropriate. The LCS consists <br />of either a control matrix spiked with analytes representative of the target <br />analytes or a certified reference material. Whenever possible, the LCS contains <br />the analyte of interest at a concentration in the chid -calibration range. This <br />standard may or may not be independent of the calibration stock standards. 0' <br />Initially method specific acceptance criteria are used. Eventually, or when <br />method s'fic criteria are unavailable, the recoveries are control charted to <br />obtain acceptance limits. <br />0 <br />