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Title: Stripping voltammetry on a new modified Glassy Carbon Electrode for lead content determination in soft water
Authors: Vasile, Gabriela 
Arnold, Georgiana Luiza 
Buica, George Octavian 
Diacu, Elena 
Ungureanu, Eleonora-Mihaela 
Dinu, Cristina 
Keywords: Poly[(2E)-2-(azulen-1-ylmethylidene) hydrazine carbothioamide];Lead;Stripping voltammetry;Polymeric film;Soft water
Issue Date: 2018
Publisher: SYSCOM 18 SRL
This study develops a new electrochemical method for quantification of Pb in soft water using stripping
voltammetry with a glassy carbon electrode modified with the functionalized azulene: (2E)-2-(azulen-1-
ylmethylidene) hydrazine carbothioamide (L)as a complexing polymer film. The optimized steps of the
proposed method consisted in experimental establishing of four parameters, namely: reduction time;
reduction potential; complexation time; pH in acetate buffer and phosphate buffer. The modified electrodes
were prepared in L solutions (1mM) in acetonitrile (CH3CN) containing tetra n-butyl ammonium perchlorate
(0.1 M TBAP) as supporting electrolyte. The electrochemical method includes four main operations: 1)
polymeric film formation by controlled potential electrolysis (CPE) at 1.7V using a charge of 1 mC; 2) film
conditioning in 0.1 M buffer acetate solution using cyclic voltammetry; 3) 25 min complexation time in a
standard solution prepared from lead nitrate (II) using as matrix ultrapure water or a real sample; 4) stripping
by differential pulse voltammetry method (DPV) in acetate buffer at pH 4.0, after 120 s reduction time at a
reduction potential of -1.0 V. Determination time for a single standard solution or real sample was around 45
min. Evaluation of the method performance parameters (linearity, working range, detection limit,
quantification limit, repeatability, and recovery) was done. It confirms that the proposed method is suitable
to detect and quantify lead content over 1.2 µg/L in soft water samples.
Revista de Chimie (Bucuresti), 2018, 69(1), p. 21-26
ISSN: 0034-7752
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