EPA Method 360.1

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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