EPA Method 410.3


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EPA Method 410.3:
Chemical Oxygen Demand in Saline Waters by Titrimetry. Official Name: Chemical Oxygen Demand (Titrimetric, High Level for Saline Waters)

Summary:
Organic and oxidizable inorganic substances in an aqueous sample are oxidized by potassium dichromate solution in sulfuric acid solution. The excess dichromate is titrate with standard ferrous ammonium sulfate using orthophenanthroline ferrous complex (ferroin) as an indicator.

Scope:
This method determines chemical oxygen demand in saline waters.

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

Interferences:
(A) Contamination: Trace organics from glassware or the atmosphere can cause gross positive error. Run blanks through glassware to eliminate trace organics.(B) Volatiles: Volatile organics may be lost when the temperature rises during the addition of sulfuric acid. (C) Chlorides: Chlorides are quantitatively oxidized by dichromate and represent a positive interference. A chloride correction procedure is provided in the method.

QC Requirements:
None.

Maximum Holding Time:
28 Days (MCAWW, Table 1).

Media:
WATER

Subcategory:
Organic

Concentration:
Greater than 250 mg/L when chloride levels exceed 1000 mg/L.

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
The LL represents lowest reportable level when chloride levels exceed 1000 mg/L.

Revision Number:
Issued 1971; Editorial Revision 1978

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TO-15

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Mercury
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