EPA Method 375.4

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EPA Method 375.4:
Sulfate by Turbidity. Official Name: Sulfate (Turbidimetric)

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

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

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.

Maximum Holding Time:
28 Days (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
1 to 40 mg sulfate/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; Editorial Revision 1978

Test Description:
Sulfate - Turbidimet

Report Number:
600/4-79-020

Instrument used for this test:
UV-VIS