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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A simple electrogravimetric experimental setup to determine Cu in alloy samples for teaching purposes

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Silva, Joao Pedro [1] ; Irikura, Kallyni [1] ; Zanoni, Maria Valnice Boldrin [1] ; Lima Gomes, Paulo Clairmont F. [1]
Total Authors: 4
[1] Unesp, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, POB 355, BR-14800900 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: CHEMICAL PAPERS; v. 75, n. 2 AUG 2020.
Web of Science Citations: 0

Electrogravimetry is a traditional analytical method for the determination of cations in aqueous solution, but the use of platinum as cathode and anode electrodes hinders its implementation in undergraduate chemistry courses with limited resources. This study proposes the replacement of expensive platinum electrodes by cheaper materials such as the dimensionally stable anode and Ni-Cr alloy as the cathode, which showed good performance in the determination of Cu by electrolysis at constant current (in galvanostatic mode). The proposed method achieved an electrogravimetric yield of 97.3 +/- 0.9%, from a solution of CuSO(4)during electrolysis carried out at 0.26 A for 60 min. The experimental setup was used to determine Cu in commercial scrap alloy waste samples containing Cu, Sn, Pb, and Zn, following a simple pretreatment employing ammonia solution. The Cu weight percentage obtained was 58.6 +/- 0.5%, which was in agreement with a value of 59.4 +/- 1.7% obtained using a comparative spectrophotometric method. Graphic abstract (AU)

FAPESP's process: 17/12790-7 - Preparation and characterization of TiO2 nanostructured electrodes modified with metal organic frameworks (MOFs) for application in the preconcentration and reduction of CO2
Grantee:Kallyni Irikura
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
Grantee:Maria Valnice Boldrin
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/22393-8 - Biochar applied in the removal of emerging contaminants present in wastewater
Grantee:Paulo Clairmont Feitosa de Lima Gomes
Support type: Regular Research Grants