Flow Injection Analysis of Sulfide at a Calmagite-Modified Pencil Graphite Electrode
[ X ]
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, a new approach is proposed for low cost, sensitive, rapid, and selective detection of sulfide based on its electrocatalytic oxidation at a calmagite-modified pencil graphite electrode. The calmagite-modified pencil graphite electrode was prepared through electropolymerization in which five successive cyclic voltammograms of 0.10 mM monomer on a pencil graphite electrode were recorded in pH 2.0 Britton-Robinson buffer containing 0.10M NaNO3. Cyclic voltammograms of the prepared polycalmagite-modified pencil graphite electrode show that the peak potential of sulfide shifted from +420 mV at an unmodified pencil graphite electrode to +250 mV at the proposed electrode. The results show that a polycalmagite-modified pencil graphite electrode exhibits good electrocatalytic response to the oxidation of sulfide. Flow injection analysis of the sulfide at the polycalmagite-modified pencil graphite electrode was performed under optimized conditions using a home-made electrochemical flow cell constructed specially for the pencil graphite electrode. The anodic peak currents obtained from flow injection amperometric curves at +250 mV in pH 9.0 Britton-Robinson buffer containing 1.0M KCl show that the polycalmagite-modified pencil graphite electrode gave a linear range of 0.10-500.0 mu M and a detection limit of 0.03 mu M. The modified electrode was successfully applied to determine sulfide in real samples, and the method was also verified with recovery studies.
Açıklama
Anahtar Kelimeler
Calmagite, electrocatalytic oxidation, flow injection analysis, pencil graphite electrode, sulfide
Kaynak
Analytical Letters
WoS Q Değeri
Q4
Scopus Q Değeri
Q2
Cilt
51
Sayı
1-2
