Flow Injection Potentiometric Assay of Hexoprenaline in Its Pure State, Pharmaceutical Preparations, and Biological Samples

Table 3

Selectivity coefficients and tolerance values for the Hx conventional-type electrodes.

	Hx-PTA			Hx-PMA
	Batch		FIA	Batch		FIA
Interferent	SSM^∗	MSM^∗∗		SSM^∗	MSM^∗∗
Na^+	3.42	4.62	5.23	3.18	4.35	4.98
K^+	2.98	3.68	5.75	3.34	4.82	5.32
Mg^2+	4.75	—	6.21	5.45	—	6.74
Ca^2+	5.32	—	5.98	5.87	—	6.48
Cr^3+	3.89	—	4.96	4.62	—	6.08
Fe^3+	4.21	—	5.66	4.51	—	6.14
Al^3+	6.83	—	7.55	5.29	—	6.59
Theronine	—	5.95	8.20	—	5.74	6.79
Leucine	—	5.45	8.97	—	6.32	7.86
Valine	—	7.62	9.32	—	5.87	7.36
Glycine	—	5.96	6.87	—	6.35	9.42
Alanine	—	8.62	10.75	—	7.44	9.87
Salbutamol	—	7.65	10.94	—	5.98	10.24
Orciprenaline	—	6.85	10.44	—	6.47	10.53
Terbutiline	—	6.77	9.87	—	6.85	10.42
Urea	—	6.50	8.09	—	7.12	10.88
Lactose	—	4.98	6.42	—	4.68	7.82
Glucose	—	4.63	7.01	—	4.79	6.89
Maltose	—	5.01	6.85	—	5.13	8.44
Fructose	—	5.23	7.35	—	5.58	7.96
Saccharose	—	4.99	7.12	—	5.62	8.90
Gum xanthine	—	6.32	7.93	—	5.78	7.38

^∗SSM: separate solution method.
^∗∗MSM: mixed solution method.