ASTM D7783 - 13

Standard Practice for Determination of the 99 %/95 % Critical Level (WCL) and a Reliable Detection Estimate (WDE) Based on Within-laboratory Data

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1.1 This practice establishes a uniform standard for computing the within-laboratory quantitation estimate associated with Z % relative standard deviation (referred to herein as WQEZ?%), and provides guidance concerning the appropriate use and application.1.2 WQEZ % is computed to be the lowest concentration for which a single measurement from the laboratory will have an estimated Z?% relative standard deviation (Z?% RSD, based on within-laboratory standard deviation), where Z is typically an integer multiple of 10, such as 10, 20, or 30. Z can be less than 10 but not more than 30. The WQE10 % is consistent with the quantitation approaches of Currie (1)2 and Oppenheimer, et al (2).1.3 The fundamental assumption of the WQE is that the media tested, the concentrations tested, and the protocol followed in the developing the study data provide a representative and fair evaluation of the scope and applicability of the test method, as written. Properly applied, the WQE procedure ensures tha

Number of pages: 13

International relationships:

ICS: 17.020 - Metrology and measurement in general

Item number: A006223