Carbon nanotube composite coated platinum electrode for detection of Ga(III)

Abstract This study demonstrates the application of composite multi-walled carbon nanotube (MWCNT) polyvinylchloride (MWNT-PVC) based on 7-(2-hydroxy-5-methoxybenzyl)-5,6,7,8,9,10-hexahydro-2H benzo [b][1,4,7,10,13] dioxa triaza cyclopentadecine-3,11(4H,12H)-dione ionophore for gallium sensor. The sensor shows a good Nernstian slope of 19.68 ± 0.40 mV/decade in a wide linear range concentration of 7.9 × 10 −7 to 3.2 × 10 −2  M of Ga(NO 3 ) 3 . The detection limit of this electrode is 5.2 × 10 −7  M of Ga(NO 3 ) 3 . This proposed sensor is applicable in a pH range of 2.7–5.0. It has a short response time of about 10 s and has a good selectivity over nineteen various metal ions. The practical analytical utility of this electrode is demonstrated by measurement of Ga(III) in river water.