Journal
ELECTROANALYSIS
Volume 22, Issue 12, Pages 1314-1322Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200900600
Keywords
Furaldehydes; Oil refining waste waters; Square wave voltammetry; Adsorptive stripping voltammetry; Glassy carbon coated mercury film electrode; Voltammetry
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Sensitive and precise voltammetric methods for the determination of trace amounts of furaldehydes, mainly as furfural (F) and 5-hydroxymethyl-2-furaldehyde (HMF), in foods, pharmaceutical and other matrices is described. Determination of total furaldehyde at < mu g g(-1) levels in alkaline buffered aqueous media was individually investigated. By the use of ordinary SWV and adsorptive square wave stripping voltammetry (Ad-SWSV), the detection limits for determination of F and HMF found to be 400 and 10 mu g g(-1), respectively. At a 1.0 mu g g(-1) level of furfural in sample, the relative standard deviation (n = 4) was 2.79%. The application of Ad-SWSV to the determination of F and HMF, after their in situ derivatization with trimethylaminoacetohydrazide chloride (Girard's reagent T) at a static mercury drop electrode (SMDE) in NH3-NH4Cl buffer of pH 9.5, resulted in a limit of detection of 10 ng g(-1) for the resolved peaks of HMF and F. The results obtained by the proposed method for the real samples were compared with the corresponding results from UV-spectrophotometry and HPLC experiments in various matrices.
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