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90 HANDBOOK OF ENVIRONMENTAL ANALYSIS <br /> Cal <br /> Response <br /> IDL <br /> .3 <br /> Analyte Concentration <br /> Figure 1-21. Intersection of IDL with calibration curve. <br /> The major function of the IDL is to separate noise from analyte responses. The <br /> presence of a signal aabovtet thehe D confidence leveL is most often rel See Figure and serves tl 22minate the false <br /> positive(Type ) at <br /> Frequency <br /> i <br /> Z <br /> TV +3 SD <br /> 0 IDL <br /> Instrument <br /> Noise Level <br /> Figure 1-22. Distribution of instrument noise levels. <br /> 4. Method Detection Limits <br /> There are many different manners in which laboratories o port results for low <br /> concentrations of target analytes. Some are as follows <br /> 130 Berthouez,P.M. 1993. A study of the precision of lead measurementsat concentrations near the <br /> method limit of detection. Water Environment Research 65(5)pp. <br /> Genium Publishing Corporation <br />