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

Table 1

Response characteristics of the electrodes under investigation.

Electrode	Min Presoak time (h)	Slope mV/concentration decade	Response time (s)	Lifespan
Hx-PTA conventional (I)	1/2	58.7	30	8 weeks
Hx-PTA graphite (II)	1.0	57.3	25	2 weeks
Hx-PTA Copper (III)	1.0	57.0	20	10 days
Hx-PTA Silver (IV)	1.5	56.4	20	7 days
Hx-PTA Platinum (V)	1.5	55.0	20	48 hours
Hx-PMA Conventional (I)	1.0	59.3	30	9 weeks
Hx-PMA graphite (II)	2.0	58.5	25	12 days
Hx-PMA Copper (III)	1.5	58.0	20	11 days
Hx-PMA Silver (IV)	1.5	55.4	20	7 days
Hx-PMA Platinum (V)	1.5	55.0	20	48 hrs