chemistry-world-2017-posters-accepted-abstracts

12 / 26

alliedacademies
Journal of Biotechnology and Phytochemistry
Volume 1 Issue 3 Chemistry World 2017
Page 64
November 13-15, 2017 Athens, Greece
7th World Congress on
Chemistry
Electrode-modified with nanoparticles
composed of 4,4'-bipyridine-silver
coordination polymer for sensitive
determination of Hg(II), Cu(II) and Pb(II)
Ana Chira1, Bogdan Bucur1, Madalina Petruta Bucur1 and Gabriel Lucian
Radu2
1National Institute of Research and Development for Biological Sciences,
Romania
2Politehnica University of Bucharest, Romania
A glassy carbon electrode modified with nanoparticles of
4,4-bipyridine-silver coordination polymer was used for
highly sensitive analysis of heavy metals (Hg(II), Cu(II) and
Pb(II)) by differential pulse voltammetry. The coordination
polymers were immobilized on the glassy carbon electrode
surface via an organic layer that contains phenylmethyl-4,4'-
bipyridinium and coordinated silver ions. The modification
method is rapid (an electrode is produced in less than 30
min); electrodes are stable and can be used for the analysis
of at least 70 real samples. A glassy carbon electrode (GCE)
modified with nanoparticles composed of a 4,4'-bipyridine
silver coordination polymer (CP) were applied to the sensitive
differential pulse voltammetric analysis of the ions Hg(II),
Cu(II) and Pb(II). The coordination polymer was prepared
by mixing a solution of silver nitrate and 4,4'-bipyridine at
room temperature. The surface of the GCE was modified with
an organic layer of synthesized 1-[(4-nitrophenyl)methyl]-
4,4'-bipyridinium and silver ions, which caused the binding
of the added Ag-bipy-CP. Anodic (oxidative) peaks of the
electrode were at +300 mV for Hg(II), -70 mV for Cu(II),
and at -540 mV for Pb(II) [versus Ag/AgCl]. The detection
limits were 0.09 mg/L Hg(II), 0.71 mg/L Cu(II) and 2.3 mg/L
Pb(II). Relative standard deviation was 3.2% at a level of 4 mg
L of Hg(II) for n=10. Importantly, the sensitivity and stability
of the developed modified electrodes allowed their used for
determination of Hg(II) in spiked fish samples and Cu(II),
Pb(II), and Hg(II) in spiked plant samples with good recovery
90 to 108%.This study demonstrates the utility of coordination
polymers for the development of electrochemical sensors and
opens a new area of applications for these versatile materials.
J Biotech and Phyto 2017