An automatic on-line sol-gel pyridylethylthiopropyl functionalized silica-based sorbent extraction system coupled to flame atomic absorption spectrometry for lead and copper determination in beer samples. (15th November 2022) - Manousi, Natalia
Graphical abstract: Highlights: Front end to flame atomic absorption system for automatic determination of metals. On-line column preconcentration method for monitoring Cu(II) and Pb(II) in beers. Synthesis a new sol–gel functionalized silica-based sorbent for metal determination. Copper and lead content of beer samples was in the range 1.6–17.6 μg L −1 . The method exhibited sensitivity, simplicity, reusability, high sampling frequency. Abstract: A novel sol–gel pyridylethylthiopropyl functionalized silica-based sorbent was synthesized and utilized in an on-line column preconcentration system coupled with flame atomic absorption spectrometry for metal determination. The developed platform was used for the determination of Pb(II) and Cu(II) in beer samples, since there are limited automatic methods for routine analysis of alcoholic beverage. For a preconcentration time of 60 s, the calculated enhancement factors were 96 for Cu(II) and 130 for Pb(II). The limits of detection were 0.33 μg L −1 and 1.98 μg L −1 for Cu(II) and Pb(II), respectively. Moreover, the RSDs were less than 2.9% indicating good method precision. The method was successfully employed for the analysis of commercially available beers. The Cu(II) content of the samples was 1.6–21.8 μg L −1 and the Pb(II) content was 7.3–17.6 μg L −1 . The developed manifold exhibited operational simplicity and good performance characteristics, indicating its potential utilization for routine analysis in beer industry.