EPA Method 340.2

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EPA Method 340.2:
Fluoride by ISE. Official Name: Fluoride (Potentiometric, Ion Selective Electrode)

Summary:
Fluoride is determined potentiometrically using a fluoride electrode in conjunction with a standard single junction sleeve-type reference electrode and a pH meter having an expanded millivolt scale or a selective ion meter having a direct concentration scale for fluoride.

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

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

Interferences:
(A) Extreme pH: Extreme pH interferes. pH should be between 5-9.Polyvalent cations: Polyvalent cations of Si4+, Fe3+, and Al3+ interfere by forming complexes with fluoride.A pH 5.0 buffer with a strong chelating agent eliminates interferences.

QC Requirements:
None.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.1 - 1,000 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

Test Description:
Fluoride - Potentiom

Report Number:
600/4-79-020

Instrument used for this test:
pH