Journal
QUIMICA NOVA
Volume 37, Issue 1, Pages 150-U196Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422014000100024
Keywords
large volume of sample; solid phase extraction; positive pressure
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Extraction/concentration is a crucial step for the analysis of organic compounds at trace level concentrations and dispersed in complex matrices. Solid-phase extraction (SPE) is one of the techniques used for this purpose. In this work, a low cost apparatus for SPE was developed that uses nitrogen under positive pressure and ensures the maintenance of the sample flow, while also allows the simultaneous extraction of different samples without cross-contamination and sample contact with plastic materials. For the system set up, easily accessible materials were used such as hypodermic needles, stainless steel tubes, rubber stoppers, and 3-way valves from serum delivery apparatus.
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