EPA Method 325.1

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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