EPA Method 360.2

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EPA Method 360.2:
Dissolved Oxygen Using a Modified Winkler Method. Official Name: Oxygen, Dissolved (Modified Winkler, Full-Bottle Technique)

Summary:
The sample is treated with manganous sulfate, potassium hydroxide and potassium iodide, and finally sulfuric acid. The initial precipitate of manganous hydroxide combines with the dissolved oxygen in the sample to form a brown precipitate, manganic hydroxide. Upon acidification, the manganic hydroxide forms manganic sulfate which acts as an oxidizing agent to release free iodine from potassium iodide. The iodine, which is stoichiometrically equivalent to the dissolve oxygen in the sample is then titrated with sodium thiosulfate of phenylarsine oxide.

Scope:
This method determines dissolved oxygen in most wastewaters and streams that contain nitrate nitrogen and not more than 1 mg/L of ferrous iron.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
Chemical Agents: Oxidizing and reducing agents, nitrate ion, ferrous iron, and organic matter could effect test results. Modifications to the original Winkler procedure have overcome many interferences. In addition, the dissolved oxygen probe (EPA Method 360.1) is an alternative procedure which is subject to less interferences.

QC Requirements:
None.

Maximum Holding Time:
8 hours (preserved) (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
Not Available.

Sample Prep:
None.

Precision:
Precision and accuracy data are not available.

Detection:
None.

Revision Number:
Issued 1971

Test Description:
Oxygen, Dissolved -

Report Number:
600/4-79-020