EPA Method 330.1


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EPA Method 330.1:
Total Residual Chlorine by Titration. Official Name: Chlorine, Total Residual (Titrimetric, Amperometric)

Summary:
Chlorine (hypochlorite ion, hypochlorous acid) and chloramines stoichiometrically liberate iodine from potassium iodide at pH 4 or less. The iodine is titrated with standard reducing agent such as sodium thiosulfate or phenylarsine oxide using an amperometer to determine the end point. The results are calculated as mg/L Cl even though the actual measurement is of total oxidizing power because chlorine is the dominant oxidizing agent present.

Scope:
The amperometric titration method is applicable to all types of waters and wastes that do not contain a substantial amount of organic matter.

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

Interferences:
Stirring can lower chlorine values by volatilization.If dilution is necessary, it must be done with distilled water which is free of chlorine, chlorine-demand, and ammonia. Copper and silver poison the electrode.

QC Requirements:
None.

Maximum Holding Time:
Analyze Immediately.

Media:
WATER

Subcategory:
Inorganic

Sample Prep:
None.

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

Detection:
None.

Revision Number:
Issued 1974; Editorial Revision 1978

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Examples:  8260
TO-15

Examples:  Dioxin
Mercury
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