Enhancing the Selectivity of Nitroso-R-Salt for the Determination of Co(II) in Lithium Bioleaching Recovery of Smartphone Batteries Using a Combinatorial Methodology Approach
Ricart, David (Universitat Politècnica de Catalunya)
Dorado, Antonio David (Universitat Politècnica de Catalunya)
Baeza Labat, Maria del Mar (Universitat Autònoma de Barcelona. Departament de Química)
Lao-Luque, Conxita (Universitat Politècnica de Catalunya)

Date:	2025
Abstract:	The selectivity of the colorimetric method for Co(II) determination using the nitroso-R-salt (NRS) in samples with complex matrices has been improved. Interferences caused by Cu(II), Fe(II), Fe(III), Mn(II), Al(III) and Ni(II) ions, which were present in the bioleach ate of lithium-ion batteries, have been solved through the sequential addition of masking agents: acetate, fluoride, ethylenediaminetetraacetic acid (EDTA), and strong acids (HSO). The absorbance of the NRS-Co(II) complex was typically measured at 525 nm, but it was also studied at 550 nm due to minimal interferences observed at 550 nm. The sequence of the masking agent's addition showed a significant influence on the interference effect. The optimal sequence was sample, acetate-acetic acid buffer solution with dissolved fluoride, NRS, EDTA and HSO. The proposed method demonstrated robust performance at 550 nm, with a relative standard deviation (RSD) around 2%, and good accuracy (RV% around 100%). The limit of detection (LoD) was 0. 1 mg L and the limit of quantification (LoQ) was 0. 3 mg L. The linear range extended up to 15 mg L (R = 0. 998). Real samples analyzed using the optimized method showed no significant differences when compared to results from atomic absorption spectroscopy, confirming its reliability.
Grants:	Agencia Estatal de Investigación PID2020-117520RA-I00
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Co(II) ; Nitroso-R-salt ; Combinatory analysis ; Batteries ; Bioleachate ; Leachate ; UV-vis spectrophotometry
Published in:	Nanomaterials, Vol. 15, Issue 16 (August 2025) , art. 1264, ISSN 2079-4991

DOI: 10.3390/nano15161264
PMID: 40863844

25 p, 1.2 MB

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