| Analysis | Method Detection Limit (MDL)1 | Minimum Level of Quantification (ML)2 | Precision3 |
|---|---|---|---|
| Alkalinity | 0.2 mg/L | 0.6mg/L | +/- 0.02 mg/L |
| Ammonia-nitrogen* | 0.010 mg/L | 0.032 mg/L | +/- 0.003 mg/L |
| Calcium | 0.06 mg/L | 0.19 mg/L | +/- 0.06 mg/L |
| Carbon, dissolved organic | 0.05 mg/L | 0.16 mg/L | +/-0.05 mg/L |
| Chloride | 0.01 mg/L | 0.03 mg/L | +/- 0.01 mg/L |
| Magnesium | 0.02 mg/L | 0.06 mg/L | +/- 0.02 mg/L |
| Nitrate-nitrogen | 0.001 mg/L | 0.003 mg/L | +/- 0.001 mg/L |
| Nitrogen, total (Persulfate) | 0.010 mg/L | 0.032 mg/L | +/- 0.010 mg/L |
| Phosphate, ortho | 0.001 mg/L | 0.003 mg/L | +/- 0.001 mg/L |
| Phophorous, total | 0.002 mg/L | 0.003 mg/L | +/- 0.002 mg/L |
| pH | 0.1 pH units | 0.3 pH units | +/- 0.1 pH units 4 |
| Potassium | 0.03 mg/L | 0.10 mg/L | +/- 0.03 mg/L |
| Silica | 0.20 mg/L | 0.6 mg/L | +/- 0.05 mg/L |
| Sodium | 0.01 mg/L | 0.03 mg/L | +/- 0.01 mg/L |
| Specific conductance | 0.4 us/cm | 1.3 us/cm | +/- 2% mg/L |
| Sulfate | 0.02 mg/L | 0.06 mg/L | +/- 0.02 mg/L |
1 The semiquantitative limit is the EPA MDL from 40 cfr part 136 as explained in detail in the epa publication http://www.epa.gov/waterscience/methods/det/rad/rad.pdf.
2 The ML is defined as the lowest level at which the entire analytical system must give a recognizable signal and acceptable calibration point for the analyte. See D. Helsel. 2005. Nondetects and Data Analysis: Statistics for Censored Environmental Data. Wiley. 288 pp., http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471671738.html.
3 Precision evaluated by repeated analysis of near detection level standard solutions.
4 Limitation of instrument scale on instrument currently in use.
* Please note that for ammonia-nitrogen that the laboratory has been able to produce data with the same precision as stated above at a LOD of 0.005 mg/1.