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The use of modified electrodes for trace metals analysis from soft water samples represent a modern approach, which can provide accurate, fast results with high accuracy and sensitivity. Therefore, many applications were developed for different toxic metals, such as As, Cd, Cu, Hg, Ni, Pb. The classic analytical methods (ICP-MS, AAS with graphite furnace, ICP-EOS with ultrasonic nebulizer) require a longer analysis time (pretreatment of the sample and analysis). In addition, the costs involved are higher than electrochemical analysis as result of expensive equipment, costs associated with method validation process, qualified staff.Thus, here we present the development of the previously obtained modified electrodes based on poly(2,2'-(ethane-1,2-diylbis((2-(azulen-2-ylamino)-2-oxoethyl)azanediyl))diacetic acid, (polyL) to laboratory-scale studies and physically validate the analytical predictions by developing an assembly system made of screen printed modified electrodes (SPEs) with polyL selective complexing polymeric films coupled with a low-cost, small, portable, stand-alone, hand-held, single-technique, potentiostat to analyze the Hg(II) ions content from environmental water samples. The purpose these modified electrodes is to provide real-time reliable information about the chemical composition of its surrounding environment.

VOLTAMMETRIC DETECTION OF MERCURY IONS AT POLY(AZULENE-EDTA) LIKE SCREEN PRINTED MODIFIED ELECTRODES

George-Octavian BUICA1*, Georgiana- Luiza Tatu (Arnold)1, Eleonora- Mihaela Ungureanu1, Gabriela Geanina VASILE2

1University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, 011061, Sector1, Bucharest, Romania,2 National Research and Development Institute for Industrial Ecology ECOIND Bucharest, 71-73 Drumul Podul

Dambovitei Street, Bucharest, 060652, Romania*buica_george@yahoo.com

AcknowledgementsThe authors gratefully acknowledge the financial support of the Romanian National Authority for Scientific Research, UEFISCDI, under grant PN-III-P2-2.1-PED-2019-0730, contract no. 293PED/2020.

Abstract

Results

References1.G.-O. Buica, I.-G. Lazar, L. Birzan, C. Lete, M. Prodana, M. Enachescu, V. Tecuceanu, A.B. Stoian, E.-M. Ungureanu, Azulene-ethylenediaminetetraacetic acid: A versatile molecule for colorimetric and electrochemical sensors for metal ions, ElectrochimicaActa 263 (2018) 382-390. 2.G.-O. Buica, A.A. Ivanov, I.-G. Lazar, G.-L. Tatu (Arnold), C. Omocea, L. Birzan, E.-M. Ungureanu, Colorimetric and voltammetric sensing of mercury ions using 2,2′-(ethane-1,2-diylbis((2-(azulen-2-ylamino)-2-oxoethyl)azanediyl)) diacetic acid, J.Electroanal.Chem., 849 (2019) 113351.

Methode principle

Complexation parameters optimisation

-0.2 0.0 0.2 0.4

0

2x10-6

4x10-6

6x10-6

8x10-6

3.5 4.0 4.5 5.0 5.50

2

4

6

i (A

)

pH

i (A

)

E vs. Ag/AgCl, 3mM KCl (V)

pH = 3.7 pH = 4.0 pH = 4.5 pH = 5.0 pH = 5.5

-1.4 -1.3 -1.2 -1.1 -1.0 -0.9 -0.8 -0.70

2

4

i / A

E vs. Ag/AgCl, 3mM KCl / V

0 10 20 30 40

0

1

2

3

4i /

A

time / minutes0 50 100 150 200 250 300

1.5

2.0

2.5

3.0

3.5

4.0

i / A

time/ s

Influence of various parameters on Hg(II) complexation process: pH, deposition potential, accumulation time and metal ions reduction time

DPV anodic stripping curves for different concentrations of Hg(II)

ions. Insets: calibration plot .