Article
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Preserved in Portico This version is not peer-reviewed
Microflow Injection System for Efficient Cu(II) Detection Across a Broad Range
Version 1
: Received: 28 May 2024 / Approved: 29 May 2024 / Online: 29 May 2024 (14:05:58 CEST)
A peer-reviewed article of this Preprint also exists.
Ricart, D.; Dorado, A.D.; Lao-Luque, C.; Baeza, M. Microflow Injection System for Efficient Cu(II) Detection across a Broad Range. Chemosensors 2024, 12, 119. Ricart, D.; Dorado, A.D.; Lao-Luque, C.; Baeza, M. Microflow Injection System for Efficient Cu(II) Detection across a Broad Range. Chemosensors 2024, 12, 119.
Abstract
In this study, a modular multi-step photometric microflow injection analysis (micro-FIA) system for the automatic determination of Cu(II) in a bioreactor has been developed. The system incorporates diverse 3D-printed modules, including a platform formed by a mixer module to mix Cu(II) with hydroxylamine which reduces Cu(II) to Cu(I) linked to a diluter module via a Tesla valve, a chelation mixer module, a disperser module, and a detector module provided by a LED light source at λ= 455 nm and a light dependence resistor (LDR) as a light intensity detector. The system measures the color intensity resulting from the chelation between Cu(I) and neocuproine. The micro-FIA system has demonstrated good capability for automatic and continuous Cu(II) determination, in a wide range of Cu concentrations from 34 to 2000 mg L-1. The device exhibits a good repeatability (coefficient of variation below 2% across the concentration range), good reproducibility, and has an accuracy of around 100% between 600 to 1900 mg·L-1. Real samples were analyzed using both the micro-FIA system and an atomic absorption spectroscopy method, revealing no statistically significant differences. Additionally, a Tesla valve located before the detector substituted a 3-way solenoid valve, eliminating the need for moving parts.
Keywords
Cu(II); 3D-printed microfluidic platform; micro-FIA; bioleaching; e-waste; circular economy
Subject
Chemistry and Materials Science, Applied Chemistry
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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