A disposable expanded graphite paper electrode with self-doped sulfonated polyaniline/antimony for stripping voltammetric determination of trace Cd and Pb. Issue 7 (1st February 2016)

• Record Type: Journal Article
• Authors: Liu, Ruili; Cao, Huijun; Nie, Zuobing; Si, Shihui; Zhao, Xueliang; Zeng, Xiaoming
• Is Part Of: Analytical methods. Volume 8:Issue 7(2016)
• Page Start: 1618
• Page End: 1625
• Publication Date: 2016-02-01
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c5ay03094c
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A conducting graphite electrode was fabricated by using expanded graphite (EG) paper by a screen-printing technique. Abstract : A conducting graphite electrode was fabricated by using expanded graphite (EG) paper by a screen-printing technique, onto which self-doped sulfonated polyaniline (SPAN) was electropolymerized via aniline and m -aminobenzenesulfonic acid monomers, and the Sb/SPAN/EG electrode was obtained by electrodepositing Sb onto the copolymer modified EG electrode. The sensitivity of the disposable EG electrode was improved by using a two-step ex situ fabrication procedure, in which the anodic doping of SbCl4 − for the SPAN film was kept at +0.3 V for 300 s and then reduced at −0.5 V for 100 s in solution containing 10 mg L −1 Sb(iii ) and 0.5 M hydrochloric acid. The disposable Sb/SPAN/EG electrodes were used for the simultaneous determination of trace lead and cadmium by differential pulse anodic stripping voltammetry. The stripping currents increased linearly when the metal concentration was in a range of 2–70 μg L −1, and the limits of detection were 0.20 μg L −1 for Pb(ii ) and 0.41 μg L −1 for Cd(ii ) at a preconcentration time of 180 s, respectively. The proposed disposable working electrode, as a new style of "mercury-free" electrodes for heavy metal measurements, exhibits encouraging properties for practical use, such as low cost, and good reproducibility.