NEMI Method Summary


Method Summary Information

Method Number:

325.2

Media:

WATER

Revision:

Issued 1978

Method Source:

U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Chloride (Colorimetric, Automated Ferricyanide AII)

Descriptive Name

Chloride by Automated Colorimetry

Source Info:

U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov

Citation:

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

31861

Byte file

Brief Method
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 And
Application:

This automated method determines chloride in drinking, surface, and saline waters; domestic and industrial wastes.

Applicable
Conc Range:

1 - 200 mg/L

Interferences:

No significant interferences.

QC Requirements:

None.

Sample Handling:

No special requirements.

Max Holding Time:

28 days (MCAWW, Table 1).

Relative Cost:

Less than $50

5765

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Method Summary Information