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Water Analyses - Typical TMDL Requests PDF Print E-mail

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 22nd Std. Methods, Ed 2005 EPA Method No. PDL mg/L Container Preservation Holding Time Max
Cations
Ammonia EPA 10205
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 200.8 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 2130B 180.1 0.05 NTU Plastic/Glass Dark, Cool to 4°C 48 hours


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