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A New Indirect Electrochemical Method for Determination of Ozone in Water Using Multiwalled Carbon Nanotubes
Author(s) -
Cesarino Ivana,
Moraes Fernando C.,
Machado Sergio A. S.,
PassarettiFilho Juliano,
Cardoso Arnaldo A.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000756
Subject(s) - detection limit , ozone , differential pulse voltammetry , electrochemistry , materials science , electrode , indigo , cyclic voltammetry , carbon nanotube , analytical chemistry (journal) , nuclear chemistry , chemistry , nanotechnology , chromatography , organic chemistry , art , visual arts
Abstract A new electrochemical methodology has been developed for the detection of ozone using multiwalled carbon nanotubes (MWCNT). The method presented here is based on the reaction of ozone with indigo blue dye producing anthranilic acid (ATN). The electrochemical profile of ATN on an electrode of glassy carbon (GC) modified with MWCNT showed an oxidation peak potential at 750 mV vs. Ag/AgCl. An analytical method was developed using differential pulse voltammetry (DPV) to determine ATN in a range of 50–400 nmol L −1 , with a detection limit of 9.7 nmol L −1 . Ozonated water samples were successfully analyzed by GC/MWCNT electrode and the recovery procedure yielded values between of 96.5 and 102.3 %.