Environmental and Analytical Chemistry Division, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014, Tamilnadu, India E-mail : askumarchem@yahoo.com Multi-walled carbon nanotube (MWCNT)-chitosan (CHIT) chemically modified glassy carbon electrode (GCE), designated as GCE/MWCNT-CHIT has been developed by modifying a suspension of MWCNT + CHIT-acetic acid mixture on a cleaned GCE and demonstrated as a selective electrochemical detector (ECD) for flow-injection

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... analysis (FIA) of hydrogen peroxide. The GCE/MWCNT-CHIT showed stable surface confined redox feature at E0´ = –0.22 V vs Ag/ AgCl with surface excess value 13.63 nmol cm–2 in pH 7 PBS. Under an optimal condition, applied potential = –0.2 V vs Ag/AgCl, hydrodynamic flow rate = 0.75 mL min–1 and pH 7 phosphate buffer as a carrier solution, the FIA-ECD showed H2O2 calibration plot in an range 50–2500 µM with detection limit and current sensitivity values 9.7 µM and 0.59 nA µM–1 (0.8345 A M–1 cm–2) respectively. There was no interference from cysteine, ascorbic acid, uric acid, nitrite, and nitrate. A cosmetic cream, clinical H2O2 and milk were further tested as real samples with ~100% recovery values.