EPA Method 340.1

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EPA Method 340.1:
Fluoride by Colorimetry. Official Name: Fluoride, Total (Colorimetric, SPADNS with Bellack Distillation)

Summary:
Following distillation to remove interferences, the sample is treated with SPADNS reagent. The loss of color resulting from the reaction of fluoride with zirconyl-SPANDS dye is a function of fluoride concentration.

Scope:
This method determines fluoride in drinking, surface, and saline waters; domestic and industrial wastes.

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

Interferences:
Reagent Addition: Error in reagent addition is the most prominent source of error in this test.

QC Requirements:
None.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.1 - 1.4 mg/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 1974 and 1978