Article written by Matt Powell, PT Manager, Analytical Products Group
Nearly two thousand laboratories
participated in this year’s DMRQA Study 25.
NPDES permit holders, contract laboratories and state and national DMRQA coordinators
were sent final reports on October 4, 2005.
Final reports indicated how well an individual laboratory
performed based on an “acceptable” or “non-acceptable” evaluation.
The tables
below summarize overall DMRQA 25 pass percentages for each analyte evaluated
by APG.
| Analyte |
Pass Percentage |
| Total Phenolics |
88% |
| Total Cyanide |
98% |
| Total Residual Chlorine |
91% |
| Oil & Grease |
93% |
| BOD |
95% |
| COD |
93% |
| TOC |
98% |
| CBOD |
96% |
| Ammonia as N |
94% |
| Nitrate Nitrogen as N |
88% |
| Orthophasphate |
94% |
| TKN |
94% |
| Total Phosphorous |
90% |
| pH |
96% |
|
|
| Analyte |
Pass Percentage |
| Aluminum |
91% |
| Arsenic |
90% |
| Cadmium |
95% |
| Chromium |
90% |
| Cobalt |
95% |
| Copper |
94% |
| Iron |
92% |
| Lead |
93% |
| Manganese |
92% |
| Mercury |
84% |
| Nickel |
97% |
| Selenium |
97% |
| Vanadium |
97% |
| Zinc |
95% |
|
“Acceptable” or “non-acceptable” evaluations are derived from
performance limits calculated according to EPA supplied regression
equations.
Should you have any questions or need additional
information concerning your DMRQA performance report please contact
Matt Powell, PT Manager, at 1-800-272-4442.
|
