Table 2.

The analytical features and the potentiometric response of the proposed sensors.

Parameters	Sensor I	Sensor II	Sensor III	Sensor IV
Slope(mv/decade)	56.9 ± 1.2	56.1 ± 0.8	51.3 ± 1.3	46.4 ± 1.5
Detection limit, (mol /L)	3.9 × 10–6	3.8 × 10–6	3.5 × 10–6	3.1 × 10–6
Correlation coefficient (r2)	0.999	0.999	0.999	0.999
Linear range, (mol /L)	6.3 × 0–6–1.0 × 0–2	4.7 × 0–6–1.0 × 0–2	5.7 × 0–6–1.0 × 0–2	5.5 × 0–6–1.0 × 0–2
Response time, (s)	< 10	< 10	< 10	< 10
pH range	3.5–8.5	3.5–8.5	3.5–8.5	3.5–8.5
Precision, (%)	0.4	0.8	1.4	0.3
Accuracy, (%)	100.2	99.5	100.4	99.8
Standard deviation, (mV)	± 2.2	± 2.4	± 1.4	± 2.1