Microflow injection analysis based on modular 3D platforms and colorimetric detection for Fe(III) monitoring in a wide concentration range
Ricart, David (Universitat Politècnica de Catalunya)
Dorado, Antonio David (Universitat Politècnica de Catalunya)
Lao-Luque, Conxita (Universitat Politècnica de Catalunya)
Baeza Labat, Maria del Mar (Universitat Autònoma de Barcelona. Departament de Química)

Fecha:	2023
Resumen:	A modular microflow injection analysis (microFIA) system for the determination of Fe(III) in a bioleaching reactor has been designed, developed and validated. The different modules of the analyzer (mixer, diluter, disperser and detector) were 3D-printed. Fe(III) quantification is due by measuring the color intensity of the chelate formed between Fe(III) and salicylic acid at 525 nm. The device has been designed to dilute, disperse and detect high Fe(III) concentrations in the form of an inexpensive multi-step photometric flow cell that uses an light-emitting diode (LED) as a light source and an light-dependent resistor (LDR) as a light intensity detector. This microFIA system has been shown to be suitable for automatic and continuous determination of Fe(III) in the operation of a bioreactor for the oxidation of Fe(II). The device has a good repeatability (less than 5% of coefficient of variation in the whole range of concentrations) and accuracy of around 100%. The analyzer features an exceptional wide linear range, between 25 and 6000 mg·L−1. The device was successfully applied to the determination of Fe(III) in real samples. The obtained results proved that the method is applicable for accurate, precise, rapid, and low-cost colorimetric analysis and didn't show significant differences with a conventional UV-Vis method.
Ayudas:	Agencia Estatal de Investigación PID2020-117520RA-I00
Nota:	Altres ajuts: acords transformatius de la UAB
Derechos:	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.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Fe(III) ; 3D-printed microfluidic platform ; FIA ; Bioleaching ; E-waste ; Circular economy
Publicado en:	Mikrochimica acta, Vol. 191 (December 2023) , art. 3, ISSN 1436-5073

DOI: 10.1007/s00604-023-06029-x
PMID: 38041754

13 p, 2.0 MB

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