Journal
JOURNAL OF SEPARATION SCIENCE
Volume 38, Issue 19, Pages 3421-3427Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201500420
Keywords
Derivatization; Formaldehyde; High-performance liquid chromatography; Magnetic solid-phase extraction
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Funding
- Tarbiat Modares University
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In this study, a simple and rapid extraction method based on the application of polypyrrole-coated Fe3O4 nanoparticles as a magnetic solid-phase extraction sorbent was successfully developed for the extraction and preconcentration of trace amounts of formaldehyde after derivatization with 2,4-dinitrophenylhydrazine. The analyses were performed by high-performance liquid chromatography followed by UV detection. Several variables affecting the extraction efficiency of the formaldehyde, i.e., sample pH, amount of sorbent, salt concentration, extraction time and desorption conditions were investigated and optimized. The best working conditions were as follows: sample pH, 5; amount of sorbent, 40 mg; NaCl concentration, 20% w/v; sample volume, 20 mL; extraction time, 12 min; and 100 mu L of methanol for desorption of the formaldehyde within 3 min. Under the optimal conditions, the performance of the proposed method was studied in terms of linear dynamic range (10-500 mu g/L), correlation coefficient (R-2 >= 0.998), precision (RSD% <= 5.5) and limit of detection (4 mu g/L). Finally, the developed method was successfully applied for extraction and determination of formaldehyde in tap, rain and tomato water samples, and satisfactory results were obtained.
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