Effect of ionophore types and conditioning time on the performance of the prepared sensors^b.

Sensor	Parameter		Performance
	Ionophore	Conditioning time	Linearity range (M)	Slopea (mV per decade)	r a
9	CX-4	One hour	3.79 × 10−5 to 1.00 × 10−2	27.46	0.9549
	CX-4	Overnight	1.80 × 10−5 to 1.00 × 10−2	31.77	0.9810
10	CX-6	One hour	6.00 × 10−6 to 1.00 × 10−2	44.62	0.9539
	CX-6	Overnight	6.00×10−6 to 2.86 × 10−3	53.43	0.9802
11	CX-8	One hour	6.00 × 10−6 to 1.00 × 10−2	58.86	0.9985
	CX-8	Overnight	6.00 × 10−6 to 1.00 × 10−2	56.59	0.9903
12	β-CD	One hour	6.00×10−6 to 1.00 × 10−2	56.34	0.9778
	β-CD	Overnight	6.00 × 10−6 to 1.00 × 10−2	58.69	0.9919
13	CX-8 : β-CD (1 : 1)	One hour	6.00 × 10−6 to 1.00 × 10−2	52.56	0.9910

^aAverage of three determinations.

^bCalix[4]arene-25,26,27,28-tetrol (CX-4), calix[6]arene (CX-6), calix[8]arene (CX-8), β-cyclodextrin (β-CD).