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View Actual EPA Method 360.1 (PDF File)
EPA Method 360.1:Dissolve Oxygen by Membrane Electrode. Official Name: Oxygen, Dissolved (Membrane Electrode)
Summary:Dissolved oxygen in a sample is measured using a probe. The most common probes depend on electrochemical reactions. Under steady state conditions, the current or potential is correlated to dissolved oxygen concentrations.
Scope:This method determines dissolved oxygen in water and is recommended as an alternative to the modified Winkler procedure when interferences are present, a non-destructive method is desired, or when continuous monitoring is desired.
Citation:Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Interferences:(A) Inorganic salts: Salts can change probe response. Use conversion factors to correct for response in saline waters.(B) Reactive gases: Reactive gases like chlorine and hydrogen sulfide can permeate the probe and disrupt operation.Temperature sensitivity: Temperature can effect a probe's output. Generally, a manufacturer provides a compensation factor.
QC Requirements:None.
Maximum Holding Time:Analyze immediately (MCAWW, Table 1).
Media:WATER
Subcategory:Inorganic
Concentration:The range can vary depending on the instrument. 0-20 mg/L is given as an example.
Sample Prep:None.
Precision:Precision and accuracy data are not available.
Detection:Generally, meters have a sensitivity of 0.05 mg/L or better.
Revision Number:Issued 1971
Test Description:Oxygen, Dissolved -
Report Number:600/4-79-020
Instrument used for this test:DOMeter