EPA Method 377.1

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EPA Method 377.1:
Sulfite by Titrimetry. Official Name: Sulfite (Titrimetric)

Summary:
An acidified sample containing a starch indicator is titrated with a standard potassium iodide-iodate titrant to a faint permanent blue end point which appears when the reducing power of the sample has been completely exhausted.

Scope:
This method determines sulfite in drinking and surface waters, sewage and industrial wastes. The primary application has been to cooling, process, and distribution waster systems and boiler feedwaters to which sulfide is added to reduce dissolved oxygen and eliminate corrosion.

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

Interferences:
(A) Temperature: The temperature must be below 50oC.Air: Minimize contact of sample with air. For example do not filter sample, and keep the tip of the buret below the sample surface.(C) Oxidizable substances such as organic compounds, ferrous iron, and sulfide are positive interferences. Sulfide can be removed (precipitated) with 0.5 g of zinc acetate.(D) Nitrite: Nitrite gives a negative interference by oxidizing sulfite when the sample is acidified. Sulfamic acid can be used to remove nitrite.(E) Metals: Copper and other metals may catalyze oxidation of sulfite. Add EDTA to complex the metals.(F) Reagents: Run blanks to correct for interferences from reagents.

QC Requirements:
None.

Maximum Holding Time:
Analyze immediately (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
The minimum detectable level is 2-3 mg/L sulfite.

Sample Prep:
None.

Precision:
Precision and accuracy data are not available.

Detection:
None.

Revision Number:
Issued 1974; Editorial Revision 1978

Test Description:
Sulfite -Titrimetric

Report Number:
600/4-79-020