NEMI Method Summary


Method Summary Information

Method Number:

375.4

Media:

WATER

Revision:

Issued 1971; Editorial Revision 1978

Method Source:

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

Analytes in this method

Subcategory:

INORGANIC

Official Name:

Sulfate (Turbidimetric)

Descriptive Name

Sulfate by Turbidity

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)

79868

Byte file

Brief Method
Summary:

A sample is treated with barium chloride to form a barium sulfate suspension under controlled conditions. The resulting turbidity from the suspension is measured with a nephelometer, and the response is compared to a sulfate standard curve.

Scope And
Application:

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

Applicable
Conc Range:

1 to 40 mg sulfate/L

Interferences:

(A) Turbidity and Color: Turbidity and color natural to the sample can interfere. Interferences can be mitigated by running sample blanks from which barium chloride has been omitted.
(B)Silica: Silica at concentrations greater than 500 mg/L will interfere.

QC Requirements:

None.

Sample Handling:

Refrigerate samples at 4^oC.

Max Holding Time:

28 Days (MCAWW, Table 1).

Relative Cost:

Less than $50

5316

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Method Summary Information