Procedures for Detection and Quantitation

Federal Advisory Committee on Detection and Quantitation for Uses in Clean Water Act Programs

Meeting #10

Target MQO Bounds

FACDQ Assignment

D. Limits for QL MQOs for Future Promulgation of New or Updated Methods

The FACDQ recommends the TWG develop recommendations for target MQO bounds for compliance and enforcement that define Quantitation. The TWG will bring these recommendations back to the FACDQ.

For example:

Precision ≤ 30% RSD
Accuracy (measured as recovery for single determination) = 20-180%
False Negative rate ≤ 10%
Ratio of Accuracy to Precision must be no less than 1.0
Example: 40% Recovery / 20% RSD = 2 O.K.,
Example: 20% Recovery / 30% RSD = .66 Not Acceptable

Straw Vote: 13 Agree, 5 Not Opposed, 0 Disagree (6/8/07 PM)
Vote: 12 Agree, 5 Not Opposed, 0 Disagree, 1 Absent (6/8/07 PM)

Technical Work Group Response

The Technical Work Group discussed this FACDQ request and agreed to the following response:

"The Technical Work Group did not reach consensus on specific target MQO bounds. They agreed that this issue is not just a technical issue because there is not a bright line for appropriate use for regulatory compliance and enforcement.