Table 2 Calibration of ISE in NaF standard aqueous solutions
Concentration of NaF, mol/L | Average | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
0.5 | 0.1 | 0.05 | 0.01 | 0.005 | 0.001 | 0.0005 | 0.0001 | 0.00005 | ||
рF | 0.533 | 1.119 | 1.362 | 2.046 | 2.320 | 3.017 | 3.310 | 4.000 | 4.301 | |
EMF | 573.0 | 532.0 | 524.2 | 470.0 | 466.9 | 409.0 | 405.5 | 353.0 | 338.0 | |
573.7 | 531.5 | 524.7 | 471.0 | 467.6 | 407.6 | 406.6 | 350.0 | 344.4 | ||
572.8 | 532.3 | 522.0 | 471.0 | 469.2 | 406.7 | 408.0 | 347.6 | 340.0 | ||
534.4 | 478.0 | 410.0 | 340.0 | |||||||
536.0 | 478.0 | 407.0 | 345.5 | |||||||
539.5 | 473.8 | 404.0 | 348.1 | |||||||
X̅ | 573.2 | 534.3 | 523.6 | 473.6 | 467.9 | 407.4 | 406.7 | 347.4 | 340.8 | |
S | 0.47 | 3.03 | 1.44 | 3.61 | 1.18 | 2.08 | 1.25 | 4.40 | 3.27 | 2.18 |
Δ X | 0.69 | 3.18 | 2.14 | 3.79 | 1.75 | 2.18 | 1.86 | 4.62 | 4.86 | 2.53 |
E(%) | 0.12 | 0.60 | 0.41 | 0.80 | 0.37 | 0.53 | 0.46 | 1.33 | 1.43 | 0.58 |