Chitosan-modified cotton thread for the preconcentration and colorimetric trace determination of Co(II)
| Main Authors: | Suarez, Willian Toito, Franco, Mathews O.K., Capitán-Vallvey, Luis Fermin, Erenas, Miguel M |
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| Format: | info publication-preprint eJournal |
| Terbitan: |
, 2020
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3906816 |
Daftar Isi:
- In this work we propose a thread-based microfluidic device (μTAD) for the preconcentration and colorimetric determination of Co(II) in water using a digital image. The reaction is based on complexation of Co(II) by 4-(2- pyridylazo) resorcinol (PAR), which changes the detection zone from yellow to red. PAR is immobilized in a chitosan membrane to retain the complex in the detection zone. The designed μTAD makes it possible to pre- concentrate and determine cobalt between 25 and 600 μg·L−1 with a relative standard deviation of 4% (n = 5), and a detection limit of 6.5 μg·L−1. The device permits an enhancement factor of 11 by combining the use of a chitosan retention membrane and a sample volume of 50 μL. Recovery experiments were performed in tap water to evaluate the accuracy of the method, and the results obtained compared to a reference method presents an error no higher than 5.7%