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Water Analyses - Typical TMDL Requests |
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Analytical Methods, Practical Detection Limits (PDL), Containers, Preservation, and Holding Times for Selected Analytes
The analytes listed in this table are frequently requested by Wyoming's Conservation Districts in their effort to determine whether or not surface water is impacted by agriculture or other activities in the drainage. The analytes requested depend on the water's beneficial uses and the type of activities potentially effecting its quality. This list is not all-inclusive; therefore the laboratory should be contacted during the design phases of a monitoring program.
| Determination |
1995 Std. Methods, 19th Ed. |
EPA Method No. |
PDL mg/L |
Container |
Preservation |
Holding Time Max |
| Cations |
| Ammonia |
4500-NH3 D |
|
0.1 |
Plastic/Glass |
H2SO4 to pH<2, Cool to 4°C |
28 days |
| Calcium |
3111B |
|
0.1 |
Plastic/Glass |
HNO3 to pH<2 |
6 months |
| Magnesium |
3111B |
|
0.1 |
Plastic/Glass |
HNO3 to pH<2 |
6 months |
| Sodium |
3111B |
|
0.1 |
Plastic/Glass |
HNO3 to pH<2 |
6 months |
| Potassium |
3111B |
|
0.1 |
Plastic/Glass |
HNO3 to pH<2 |
6 months |
| Anions |
| Alkalinity |
2320B |
|
|
Plastic/Glass |
Cool to 4°C |
14 days |
| Chloride |
4110B, 4500-Cl-F |
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Fluoride |
4110B, 4500-F-F |
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Nitrate |
4110B, 4500-NO3-F |
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Nitrite |
4110B, 4500-NO2-F |
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Phosphate, ortho |
|
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Phosphorus, Total |
4500-P B.5, 4500-P F. |
|
0.020 |
Plastic/Glass |
H2SO4 to pH<2 |
28 days |
| Sulfate |
4110B, 4500-SO42--C |
300.0 |
0.10 |
Plastic/Glass |
Cool to 4°C |
48 hours |
| Metals |
| Selenium |
3113B |
200.9 |
0.005 |
Plastic/Glass |
HNO3 to pH<2 |
6 months |
| Other |
| COD |
5220D (Hach) |
|
5 |
Plastic/Glass |
H2SO4 to pH<2, Cool to 4°C |
28 days |
| Conductivity |
2510 B |
|
1 uS/cm |
Plastic/Glass |
Cool to 4°C |
28 days |
| pH |
4500-H+ B |
150.1 |
|
Plastic/Glass |
None, Cool to 4°C |
14 days |
| Solids, TDS |
2540C |
160.1 |
50 |
Plastic/Glass |
Cool to 4°C |
7 days |
| Solids, TSS |
2540D |
160.2 |
1.0 |
Plastic/Glass |
Cool to 4°C |
7 days |
| TOC |
5310C |
415.4 |
|
Plastic/Glass |
H2SO4 to pH<2, Cool to 4°C |
28 days |
| Turbidity |
2130D |
180.1 |
0.05 NTU |
Plastic/Glass |
Dark, Cool to 4°C |
48 hours |
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