PRECONCENTRATION OF COPPER FROM NATURAL WATER SAMPLES USING LIGAND-LESS<i>IN SITU</i>SURFACTANT-BASED SOLID PHASE EXTRACTION PRIOR TO FAAS DETERMINATION

Mohammadi, Sayed Zia; Afzali, Daryoush; Sabermahani, Fatemeh; Afshari, Samira

doi:10.5935/0100-4042.20140239

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“…Several separation-enrichment techniques have been reported for conventional instrumental analyses. These include preconcentration techniques such as liquid-liquid extraction, 18,19 membrane filtration, 20,21 microextraction, 22,23 cloud point extraction, [24][25][26] ion exchange, 27 solid-phase extraction (SPE), 28,29 and coprecipitation. 30,31 Some of the preconcentration techniques are also coupled with μ-PADs, which include a heating method, 32,33 ion concentration polarization, 34 and a pumping system.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic paper-based analytical devices coupled with coprecipitation enrichment show improved trace analysis of copper ions in water samples

2022

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The present study was focused on improving sensitivity to trace levels of Cu(II) by subjecting microfluidic paper-based analytical devices (μ-PADs) to a preconcentration process via coprecipitation using aluminum hydroxide. The experimental conditions were optimized for the pH of the coprecipitation, centrifugation, and amounts of reagents that were deposited onto µ-PADs for Cu(II) assay. The resultant limit of detection reached as low as 0.003 mg L -1 with a linear range of 0.01-2.00 mg L -1 . The relative standard deviations for intra-and inter-day precision were 3.2 and 4.6%, respectively (n = 9). Spiked water samples were analyzed using the μ-PADs after coprecipitation preconcentration. The results were verified by comparing them with those of inductively coupled plasma-optical emission spectrometry (ICP-OES).Recoveries ranged from 97.1-104% and from 98.7-105% using the present method and ICP-OES, respectively. These results suggest that the simple, highly sensitive, and inexpensive proposed method would be helpful for analyzing trace levels of Cu(II) in water samples in poorly equipped laboratories.

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