| Full text | |
| Author(s): |
Silva, Joao Pedro
;
Irikura, Kallyni
;
Zanoni, Maria Valnice Boldrin
;
Lima Gomes, Paulo Clairmont F.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | CHEMICAL PAPERS; v. 75, n. 2, p. 8-pg., 2020-08-27. |
| Abstract | |
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: | 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 Opportunities: | 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 Opportunities: | Regular Research Grants |
| 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |