1.1 This practice provides a procedure to estimate the detection limit, L_D, of a well-behaved measurement method or process in air quality measurements. It uses the magnitude and the variance of the background signal and all other systematic and random errors of that method at the background signal level to determine the minimum amount an analyte can be detected above the background; that is, L_D. This practice will yield L_D with a statistically determined probability of false positive and false negative results and a probability of reproducing that DL in future measurements. 1.2 This practice is applicable to analytical methods that generate consistent results when samples at and just above background are measured. 1.3 For instances in which laws or regulations dictate the use of a particular methodology for determining L_D, this practice does not take the place of that methodology but may be used in addition to the required methodology. 1.4 This practice does not address the treatment of data points that fall below the DL or the way in which such data points should be reported. 1.5 Units--The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Keywordsdetection limit; statistical evaluation; probability estimate; normal distribution
There are numerous, non-standard practices for calculating the detection limit. This standard will provide a standard practice for use in air quality test methods.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development