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View Actual EPA Method 375.4 (PDF File)
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