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Table 2 Potentiometric selectivity coefficients of some interfering ions, using methylpheinadte-PVC sensors

From: New potentiometric sensors for methylphenidate detection based on host–guest interaction

Interferent, J \(\mathop K\nolimits_{MP,B}^{Pot}\)
Sensor 1
\(\mathop K\nolimits_{MP,B}^{Pot}\)
Sensor 2
\(\mathop K\nolimits_{MP,B}^{Pot}\)
Sensors 3
Na+ 1 × 10−3 2 × 10−3 1.8 × 10−3
K+ 2 × 10−2 2 × 10−3 1.7 × 10−2
Ca2+ 1.9 × 10−3 1.7 × 10−3 2.0 × 10−3
Fe+ 2.0 × 10−3 1.8 × 10−3 1.9 × 10−3
Acetate 1.8 × 10−3 1.8 × 10−3 1.9 × 10−3
Phosphate 2 × 10−3 1.7 × 10−3 1.9 × 10−3
Citrate 2 × 10−3 1.8 × 10−3 2.0 × 10−3
benzoate 2 × 10−3 1.8 × 10−3 2.0 × 10−3
Caffeine 3.7 × 10−3 4.0 × 10−3 3.3 × 10−3
Glycine 2.8 × 10−2 2.7 × 10−2 2.8 × 10−2
l-Cysteine 2.7 × 10−2 2.8 × 10−2 2.7 × 10−2
Tryptophan 2 × 10−3 2.1 × 10−3 2.1 × 10−3
Starch 3.8 × 10−3 4.8 × 10−3 4.5 × 10−3
Magnesium stearate 3.8 × 10−3 4.0 × 10−3 3.5 × 10−3
Lactose monohydrate 3.9 × 10−3 4.7 × 10−3 3.5 × 10−3
Glucose 3.7 × 10−2 4.3 × 10−2 3.3 × 10−2
Microcrystalline cellulose 3.5 × 10−3 4.7 × 10−3 4.6 × 10−3
  1. Sensor 1 (β-CD), Sensor 2 (γ-CD) and Sensor 3 (calaxirene)