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View Actual EPA Method 330.1 (PDF File)
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