CWEA LAB ANALYST EXAM QUESTIONS
AND ANSWERS LATEST TOP SCORE.
1. instrument detection level ANS >>> produces a signal greater than 5 times
the instru- ment signal ANS >>>noise ratio
2. lower level of detection ANS >>> concentration that produces a signal
2(1.645)s above the mean of blank analysis; establishes Type I/Type II errors;
also called detection level or level of detection LOD
3. method detection level MDL ANS >>> when processed through the entire
method pro- duces a signal that has 99% probability of being different from the
blank
4. establishing MDL ANS >>> 7 replicates at concentrations 1-5 times the estimated
MDL
5. level of quantitation (minimum quantifiable level) ANS >>> produces a signal
sufficient- ly stronger than the blank, such that it can be detected with a specified
level of reliability
6. minimum reporting level MRL ANS >>> concentration is no lower than the
concentration of the lowest calibration standard for that analyte and can only be
used if acceptable QC criteria are met
7. duplicate sample ANS >>> collected separately, representative companion to the
original, a special case replicate
https://www.stuvia.com/user/CULTIVATED 1/3
AND ANSWERS LATEST TOP SCORE.
1. instrument detection level ANS >>> produces a signal greater than 5 times
the instru- ment signal ANS >>>noise ratio
2. lower level of detection ANS >>> concentration that produces a signal
2(1.645)s above the mean of blank analysis; establishes Type I/Type II errors;
also called detection level or level of detection LOD
3. method detection level MDL ANS >>> when processed through the entire
method pro- duces a signal that has 99% probability of being different from the
blank
4. establishing MDL ANS >>> 7 replicates at concentrations 1-5 times the estimated
MDL
5. level of quantitation (minimum quantifiable level) ANS >>> produces a signal
sufficient- ly stronger than the blank, such that it can be detected with a specified
level of reliability
6. minimum reporting level MRL ANS >>> concentration is no lower than the
concentration of the lowest calibration standard for that analyte and can only be
used if acceptable QC criteria are met
7. duplicate sample ANS >>> collected separately, representative companion to the
original, a special case replicate
https://www.stuvia.com/user/CULTIVATED 1/3
