Historical
ASTM D6091-07(2014)
Standard Practice for 99?%/95?% Interlaboratory Detection Estimate (IDE) for Analytical Methods with Negligible Calibration Error
1.1 This practice establishes a standard for computing a 99 %/95 % Interlaboratory Detection Estimate (IDE) and provides guidance concerning the appropriate use and application. The calculations involved in this practice can be performed with DQCALC, Microsoft Excel-based software available from ASTM.2
1.2 The IDE is computed to be the lowest concentration at which there is 90 % confidence that a single measurement from a laboratory selected from the population of qualified laboratories represented in an interlaboratory study will have a true detection probability of at least 95 % and a true nondetection probability of at least 99 % (when measuring a blank sample).
1.3 The fundamental assumption of the collaborative study is that the media tested, the concentrations tested, and the protocol followed in the study provide a representative and fair evaluation of the scope and applicability of the test method as written. When properly applied, the IDE procedure ensures that the 99 %/95 % IDE has the following properties:...
1.4 The IDE applies to measurement methods for which calibration error is minor relative to other sources, such as when the dominant source of variation is one of the following (with comment):
1.4.1 Sample Preparation, and calibration standards do not have to go through sample preparation.
1.4.2 Differences in Analysts, and analysts have little opportunity to affect calibration results (such as with automated calibration).
1.4.3 Differences in Laboratories, for whatever reasons, perhaps difficult to identify and eliminate.
1.4.4 Differences in Instruments (measurement equipment), which could take the form of differences in manufacturer, model, hardware, electronics, sampling rate, chemical processing rate, integration time, software algorithms, internal signal processing and thresholds, effective sample volume, and contamination level.
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