Selective Extraction and Determination of Chromium Concentration Using Luffa cylindrica Fibers as Sorbent and Detection by FAAS

Abstract

In this approach, a nonchromatographic method was developed for selective extraction and determination of Cr(III) concentration in isotonic and energy drinks by FAAS. This new method uses Luffa cylindrica fibers as the solid phase extraction and an off-line flow injection system. Cr(III) and Cr(VI) adsorption behavior onto Luffa fibers allowed the selective separation of Cr(III) in the pH range of 4 to 5. The system variables were optimized through full factorial and Doehlert designs. Under optimal conditions, the detection and quantification limit for Cr(III) was 19.2 µg·L−1 and 63.9 µg·L−1, respectively, with precision below 0.19%. A high tolerance toward interfering ions was observed for the proposed method. Recovery test results obtained for different isotonic and energy drinks samples were higher than 87.6%. The method’s accuracy was confirmed through analysis of certified reference materials, water and sediment river samples (APS-1071 and APS-1066).

Sponges and Sponge-Like Materials in Sample Preparation: A Journey from Past to Present and into the Future

“…The sponges exhibited exceptional selectivity for phosphopeptides, over other non-phosphopeptides, making feasible their detection, even when their concentration was 100 times lower than other non-phosphopeptides. In the second report, the authors used Luffa sponges for the selective extraction of chromium (III) [79]. Selectivity over chromium (VI) was ensured by adjusting the pH of the solution to 4.0.…”

Remoción de compuestos fenólicos totales de aguas del beneficio de café sobre una matriz de origen natural

“…La Luffa cylindrica (L.) Roem. (Cucurbitaceae), conocida comúnmente como estropajo, ha mostrado ser un material apropiado en la retención de iones como cianuro (Arana et al, 2017), cobre (Liatsou et al, 2017;Liatsou et al, 2020), cromo (De Sousa et al, 2019), colorantes (Caicedo et al, 2018;Demir and Deveci, 2018;Baharlouei et al,2018), hormonas (Ribeiro et al, 2018 y para la inmovilización de microorganismos degradadores de fenoles (Bera and Mohanty, 2020) entre otros contaminantes por tener características adsorbentes naturales debido a los grupos funcionales presentes en el material que permiten interacciones con los contaminantes, además de ser biodegradable y económico.…”