EPA Method 375.3

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EPA Method 375.3:
Sulfate by Gravimetric Determination. Official Name: Sulfate (Gravimetric)

Summary:
Sulfate is precipitated as barium sulfate in a hydrochloric acid medium by the addition of barium chloride. After a period of digestion, the precipitate is filtered, washed with hot water until free of chloride, ignited, and weighed as BaSO4.

Scope:
This method is applicable to drinking, surface and saline water; and domestic and industrial wastes.

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

Interferences:
(1) High results may be obtained for samples that contain suspended matter, nitrate, sulfite and silica.(2) Alkali metal sulfates frequently yield low results. This is especially true of alkali hydrogen sulfates. Occlusion of alkali sulfate with barium sulfate causes the substitution of an element of lower atomic weight than barium in the precipitate. Hydrogen sulfate of alkali metal acts similarly and decomposes when heated. Heavy metals such as chromium and iron, cause low results by interfering with complete precipitation and by formation of heavy metal sulfates.

QC Requirements:
not included

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
10mg/L - * (* Method does not specify an upper detection limit.)

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
-

Revision Number:
Issued 1974; Editorial Revision 1978