Study of Analytical Parameters of a Differential Pulse Voltammetric Method using Chemically Modified Electrodes for Lead Analysis in Water

Abstract

The development of a new voltammetric method for the determination of Pb2+ ions in water samples using glassy carbon electrodes modified with 2,6-bis((E)-2-(thiophen-2-yl)vinyl)-4-(4,6,8-trimethylazulen-1-yl)pyrylium perchlorate is here presented. The analytical parameters for differential pulse voltammetry (DPV) were established and the method was applied for Pb2+ ions determination in acetate buffer solution at pH 5.5. For the developed DPV method the linearity of calibration curve was set up between 20.71mg L-1 - 103.6 mg L-1 with a good correlation coefficient R2=0.9988, the intermediate precision was calculated for three lead concentrations:20, 60,100mg L-1.The obtained detection and quantification limits were 3.1 mg L-1, respectively 10.4 mg L-1. An uncertainty budget was developed and the value of expanded uncertainty was assessed. The optimized method was used to analyze Pb2+ ions from of water samples and good correlation with standard method was obtained.

Electrochemical System for Field Control of Hg2+ Concentration in Wastewater Samples

“…In our previous studies, we introduced statistics and metrics other than standard deviation in the experimental tests, such as repeatability, intermediate precision, and measurement uncertainty [ 51 , 52 ].…”

Electroactive properties of a new azulene thioxo-imidazolidin-4-one ligand for modified electrodes

“…Researches were carried out to prepare polyazulene films or metal complexes of azulene derivatives [3][4][5]. Our research team is working on developing sensors based on azulene derivatives for heavy metals recognition [6][7][8].…”

Chemically Modified Electrodes Based on 4-(azulen-1-yl)-2,6-bis ((e)-2-(thiophen-2-yl)vinyl) Pyrylium Perchlorate

“…The charged pyrylium ring and the pyridinium heteroaromatic ring have a good electron donor on azulene-1-yl moiety, and increase the stability of the conjugated system, giving valuable push-pull features to the compound. Several similar compounds have been examined and found as good ligands for metal ions detection [12][13][14], precatalysts used for direct oxidation of amines to nitriles [15] and for the preparation of modified electrodes [16][17][18][19].…”