Development of performance characteristics of potassium selective sensor modified with carbon nanotube

In this study the performance characteristics of all solid-state PVC membrane K+-selective sensors modified with carbon nanotube were investigated. The performances of prepared microsensors were tested by static media measurements. The developed microsensor had a slope of approximately 59.4 mV/ per decade, with a short response time (<15 s) and a long lifetime (4-6 weeks). The developed sensor exhibited a linear behavior in the concentration range of 10-7-10-1 mol.L-1 with a detection limit of 6x10-8 mol.L-1. The determination of potassium in various commercial water samples was performed successfully using the prepared microsensor. The results were compared with the AAS method.