TABLE 2.

Effect of the carbon paste electrode composition on the response characteristics: slope concentration range (CR) and detection limit (DL).

Sensor	Electrode composition				Response characteristics
	Graphite	Plasticizer	Ionophore	Modifier	Slopea		CR	DL
	Wt%	Wt%	Wt%	Wt%	mV/conc. decade	R2	M	M
1	49	50 TCP	1 MIP3	–	39.0 ± 1.3	0.975	10–4–10–6	1.0 × 10–6
2	47	50 TCP	3 MIP3	–	44.0 ± 1.1	0.983	10–4–10–6	1.0 × 10–6
3	43	54 NPOE	3 MIP3	–	52.0 ± 0.6	0.992	10–4–10–6	1.0 × 10–6
4	41	51 NPOE	3 MIP3	5 MWCNTs	43.0 ± 0.8	0.995	10–4–10–6	6.3 × 10–7
5	41	51 NPOE	3 MIP3	5 Fe2O3@MWCNTs	55.6 ± 0.3	0.986	10–3–10–8	9.8 × 10–8
6	41	54 NPOE	3 NIP3	5 Fe2O3@MWCNTs	49.5 ± 0.4	0.996	10–6–10–4	6.3 × 10–7

*An average for the values of 5 measurements, with the standard deviations of the different sensors.