EPA Method 375.1

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EPA Method 375.1:
Sulfate by Colorimetry. Official Name: Sulfate (Colorimetric, Automated, Chloranilate)

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:
This automated 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:
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.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
10 to 400 mg sulfate/L

Sample Prep:
None.

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

Detection:
None.

Revision Number:
Issued 1971