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Section No 8 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 5 of 5 <br /> ■ Calibration standards are prepared at a minimum of three <br /> concentration levels for each parameter of interest, <br /> ■ Area responses are tabulated against concentration for each compound <br /> of interest, <br /> w Response factors for each compound are calculated, <br /> ■ If the response factor over the working range is consistent (i e <br /> less than 15 percent of relative sstandard deviation);the RF-can be� <br /> assumed to be invariant and the average RF used for calculations <br /> Alternately, the results can be used to plot a calibration curve of <br /> response ratios against response factors ; and <br /> ■ The working calibrate-on curve or response factor must be verified on <br /> each working day by the measurement of one or more calibration <br /> standards If the response for any parameter varies from the <br /> predicted response by more than ±15 percent, the test must be <br /> repeated using a fresh calibration standard, or alternatively, a new <br /> calibration curve must be prepared for that compound <br /> 8 2 Laboratory Calibration Procedures <br /> Laboratory=cal ibration=procedures are—unique------to-=.--each---individual... <br /> laboratory <br /> 8-5 <br />