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Determining "reliable detection limits" (RDLs) for environmental analyses.
Thomas Georgian1, Kenneth E Osborn
1U.S. Army Corps of Engineers, Omaha, Nebraska 68144-3869, USA. Thomas.Georgian@nwd02.usace.army.mil
Quality Assurance (San Diego, Calif.)
|May 15, 2003
Summary
The method detection limit (MDL) only protects single measurements. This study introduces a cost-effective "reliable detection limit" for indefinite future measurements, minimizing false negatives and false positives.
Area of Science:
- Environmental Science
- Analytical Chemistry
Background:
- The method detection limit (MDL) is widely used but offers limited protection against false positives for subsequent measurements.
- Current MDL practices do not account for false negatives, posing risks in critical analyses.
Purpose of the Study:
- To introduce a simple, cost-effective method for estimating a
- reliable detection limit
- that overcomes MDL limitations.
Main Methods:
- Development of a novel statistical approach to estimate the reliable detection limit.
- Validation of the proposed method for its applicability in analytical chemistry.
Main Results:
- The proposed reliable detection limit provides protection against false positives for an indefinite number of future measurements.
- This new statistic significantly minimizes the occurrence of false negatives compared to the standard MDL.
Conclusions:
- The reliable detection limit offers a more robust and dependable measure for analytical testing than the conventional MDL.
- Implementing the reliable detection limit enhances the accuracy and reliability of environmental and chemical analyses.