NEMI Method Summary


Method Summary Information

Method Number:

375.1

Media:

WATER

Revision:

Issued 1971

Method Source:

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

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Sulfate (Colorimetric, Automated, Chloranilate)

Descriptive Name

Sulfate by 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)

33970

Byte file

Brief Method
Summary:

Sulfate in a sample is treated with barium chloranilate to precipitate barium sulfate and release a highly colored chloranilate ion. The absorbance of the chloranilic acid is measured with a colorimeter and is proportional to sulfate concentration.

Scope And
Application:

This automated method determines sulfate in drinking and surface waters; domestic and industrial wastes.

Applicable
Conc Range:

10 to 400 mg sulfate/L

Interferences:

Cations: Cations such as calcium, aluminum, and iron interfere by precipitating the chloranilate. These cations can be removed by passing the sample through a ion exchange column.

QC Requirements:

None.

Sample Handling:

Refrigerate samples at 4^oC.

Max Holding Time:

28 Days (MCAWW, Table 1).

Sample Prep Met

None.

Relative Cost:

Less than $50

5315

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Method Summary Information