Composition (%) Binder G% B% S C.R. LOD R(s) Complexes Zn-TSC   0.5 1 (TCP) 55 44.5 29.5±0.0 1.0x10-7-1.5x10-3 1.5x10-7 ≤15 1.0⃰  2 (TCP) 55 44 32.5±0.5* 5.0×10-8-2.0×10-3 2.5x10-8 ≤10 3 3 (TCP) 55 42 28.5±0.5 1.5x10-7-1.0x10-3 3.9x10-8 ≤14 0.5 4 (DOP) 55 44.5 28.5±0.5 5.5x10-7-4.0x10-3 4.2x10-7 ≤15 1 5 (DOP) 55 44 29.0±0.5 4.6x10-7-2.0x10-3 2.5x10-7 ≤10 3 6 (DOP) 55 42 29.5±0.5 3.5x10-7-1.0x10-3 1.0x10-7 ≤12 0.5 7 (TBP) 55 44.5 24.0±0.5 7.4x10-7-2.0x10-3 6.5x10-7 ≤15 1 8 (TBP) 55 44 25.5±0.5 6.3x10-7-1.5x10-3 5.0x10-7 ≤15 3 9 (TBP) 55 42 25.0±0.5 5.5x10-7-1.0x10-3 3.5x10-7 ≤12 0.5 10 (DBP) 55 44.5 24.0±0.5 7.9x10-7-5.0x10-3 6.3x10-7 ≤12 1 11 (DBP) 55 44 26.5±0.5 6.5x10-7-2.0x10-3 4.0x10-7 ≤12 3 12 (DBP) 55 42 27.0±0.5 7.2x10-7-5.0x10-3 5.5x10-7 ≤15 Zn-ATSC             0.5 13 (TCP) 55 44.5 24.7±0.5 5.0x10-7-6.3x10-3 1.5x10-7 ≤15 1.0* 14 (TCP) 55 44 28.5±0.5⃰ 6.3×10-8-7.9×10-3 5.0x10-8 ≤10 3 15 (TCP) 55 42 28.0±0.5 1.5x10-7-1.0x10-3 7.9x10-8 ≤10 0.5 16 (DOP) 55 44.5 27.0±0.5 7.8x10-7-6.3x10-3 6.3x10-7 ≤15 1 17 (DOP) 55 44 25.5±0.5 5.0x10-7-5.0x10-3 4.0x10-7 ≤12 3 18 (DOP) 55 42 26.5±0.5 2.0x10-7-5.0x10-3 1.0x10-7 ≤15 0.5 19 (TBP) 55 44.5 23.5±0.5 8.9x10-7-5.0x10-3 5.0x10-7 ≤15 1 20 (TBP) 55 44 24.5±0.5 7.8x10-7-4.3x10-3 5.3x10-7 ≤15 3 21 (TBP) 55 42 24.0±0.5 5.0x10-7-1.0x10-3 3.1x10-7 ≤15 0.5 22 (DBP) 55 44.5 19.0±0.5 6.3x10-6-5.0x10-3 4.6x10-7 ≤15 1 23 (DBP) 55 44 20.0±0.5 5.0x10-6-7.8x10-3 2.5x10-7 ≤15 3 24 (DBP) 55 42 20.0±0.5 1.0x10-6-1.0x10-3 8.9x10-7 ≤20 Response characteristics of the Zn-Complexes sensors Parameters Sensor 1 Sensor 2 Sensors Zn-TSC Zn-ATSC Composition 1.0% (I.P) 1.0% (I.P) (W/W %) +55.0% G + 44.0% P +55.0% G+ 44.0% P Slope (mV/decade) 32.5±0.5 28.5±0.5 Correlation  coefficient (r) 0.999 0.998 LOD (M) 2.5 x 10-8 5.0x10-8 Linear range (M) 5.0×10-8-2.0×10-3 6.3×10-8-7.9×10-3 Working pH range 3.5–8.0 3.5–8.0 Response time (s) ≤10 s ≤10 s Recovery (%) ± S.D* 99.45±0.5 98.75±0.5 Robustness 99.50±0.5 99.40±0.5 Ruggedness 99.80±0.5 99.50±0.5

G: graphite, B: binder, S: slope (mV/decade); C.R.: concentration range (M); LOD: limit of detection; R(s): response time (s). * The selected sensor at 95% confidence intervals, average of five replicates at 25.0 ± 0.1°C Table 1: Effect of binders on composition and characteristics of sensors (Zn-TSC) and (Zn-ATSC).