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Table 4 The accuracy of measurement of F in NaF standard aqueous solutions

From: Evaluation of free and total fluoride concentration in mouthwashes via measurement with ion-selective electrode

NaF / TISAB

EMF

+  10 ml TISAB

V (NaF) added, ml

ΔЕ

с (F)

%

S

X

E, %

5 / 5

508.2

490.9

9.2

17.3

0.096

96

95.8

1.92

2.21

2.3

3 / 7

495.6

478.5

4.0

17.1

0.095

95

7 / 3

518.4

498.7

19.2

19.7

0.094

94

3 / 7

497.0

478.8

4.2

18.2

0.099

99

5 / 5

505.0

488.0

9.1

17.0

0.095

95