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View Actual EPA Method 325.1 (PDF File)
EPA Method 325.1:Chloride by Automated Colorimetry . Official Name: Chloride (Colorimetric, Automated Ferricyanide AI)
Summary:Thiocyanate ion (SCN) is liberated from mercuric thiocyanate through sequestration of mercury by chloride ion to form un-ionized mercuric chloride. In the presence of ferric ion, the liberated SCN forms a highly colored ferric thiocyanate in concentration proportional to the original chloride concentration. Measurements of the colored complex are made using an automated spectrophotometer.
Scope:This automated method determines chloride in drinking, surface, and saline waters; domestic and industrial wastes.
Citation:Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Interferences:No significant interferences.
QC Requirements:None.
Maximum Holding Time:28 days (MCAWW, Table 1).
Media:WATER
Subcategory:Inorganic
Concentration:1 - 250 mg/L
Precision:Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.
Detection:-
Revision Number:Issued 1971