EPA Method 330.1

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

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.

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

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

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:

Maximum Holding Time:
Analyze Immediately.



Sample Prep:

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


Revision Number:
Issued 1974; Editorial Revision 1978

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Examples:  8260

Examples:  Dioxin
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