Fiber fabric sorbent extraction for on-line toxic metal determination in energy beverages

Kazantzi V., Anthemidis, A.

Abstract

In the present study, a novel flow injection on-line fiber fabric sorptive extraction (FI- FFSE) platform was developed, in order to take advantage of the benefits of FPSE technique in automatic mode. For this purpose, a microcolumn packed with a sol-gel coated fiber fabric medium, the poly-dimethylsiloxane (PDMS), incorporated into a FI-SPE system, was presented for the first time. This configuration provides insignificant backpressure, resulting in high loading flow rates and shorter analytical cycles. The on-line formed complex of metal with sodium diethyl dithiocarbamate (DDTC) was retained onto the fabric surface, while methyl isobutyl ketone (MIBK) was used to elute the analytes prior to atomization. For 90 s preconcentration time, enrichment factors of 165 and 43 and detection limits (3s) of 1.6 and 0.3 µg L^-1 were achieved for lead and cadmium determination, respectively, with a sampling frequency of 30 h^-1. The developed method has been successfully demonstrated for on-line lead and cadmium determination by FAAS in commercially available energy and refreshment drinks.

Keywords

automatic, fabric phase sorptive extraction, atomic absorption spectrometry, energy beverages, toxic metals

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IMEKO TC

TC23 - Metrology in Food and Nutrition

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