Hach DR2400 Manual page 285

Method Performance
Summary of Method
Fluoride_AccuVac_Other_SPD_Eng_Ody.fm
Precision
-
Standard: 1.00 mg/L F
Program
190
195
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
Sensitivity
at 0
at 1 ppm
at 2 ppm
See Section 3.4.5 Sensitivity on page 44 for more information.
The SPADNS Method for fluoride determination involves the reaction of
fluoride with a red zirconium-dye solution. The fluoride combines with part of
the zirconium to form a colorless complex, thus bleaching the red color in an
amount proportional to the fluoride concentration. This method is accepted by
the EPA for NPDES and NPDWR reporting purposes when the samples have
been distilled. Seawater and wastewater samples require distillation. Test results
are measured at 580 nm.
95% Confidence Limits of Distribution
0.95–1.05 mg/L F
0.88–1.12 mg/L F
∆Concentration
∆Abs
(Program 190)
0.010 0.03 mg/L F
0.010 0.03 mg/L F
0.010 0.04 mg/L F
Fluoride
–
–
∆Concentration
(Program 195)
– –
0.02 mg/L F
– –
0.03 mg/L F
– –
0.04 mg/L F
Fluoride
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