Ionic liquid-based dispersive liquid–liquid microextraction for the determination of formaldehyde in wastewaters and detergents
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Spectrophotometry in combination with ionic liquid-based dispersive liquid–liquid microextraction (DLLME) was applied for the extraction and determination of formaldehyde in real samples. The method is based on the reaction of formaldehyde with methyl acetoacetate in the presence of ammonia. The variation in the absorbance of the reaction product was measured at 375 nm. An appropriate mixture of ethanol (disperser solvent) and ionic liquid, 1-hexyl-3-methylimidazoliumhexafluoro-phosphate [C6MIM][PF6] (extraction solvent) was rapidly injected into a water sample containing formaldehyde. After extraction, sedimented phase was analyzed by spectrophotometry. Under the optimum conditions, the calibration graph was linear in the range of 0.1–20 ng mL−1 with the detection limit of 0.02 ng mL−1 and limit of quantification of 0.08 ng mL−1 for formaldehyde. The relative standard deviation (RSD%, n = 5) for the extraction and determination of 0.8 ng mL−1 of formaldehyde in the aqueous samples was 2.5%. The results showed that DLLME is a very simple, rapid, sensitive, and efficient analytical method for the determination of trace amounts of formaldehyde in wastewaters and detergents, and suitable results were obtained.
KeywordsFormaldehyde Ionic liquid Dispersive liquid–liquid microextraction Wastewaters Spectrophotometry
We gratefully acknowledge the post-graduate office of Guilan University for supporting this work.
- Kiba, N., Sun, L. M., Yokose, S., Kazue, M. T., & Suzuki, T. T. (1999). Determination of nano-molar levels of formaldehyde in drinking water using flow-injection system with immobilized formaldehyde dehydrogenate after off-line solid-phase extraction. Analytica Chimica Acta, 378, 169–175.CrossRefGoogle Scholar
- Li, Q., Sritharathikhum, P., Oshima, M., & Motomizu, S. (2008). Development of novel detection reagent for simple and sensitive determination of trace amounts of formaldehyde and its application to flow injection spectrophotometric analysis. Analytica Chimica Acta, 612, 165–172.CrossRefGoogle Scholar
- Nash, T. (1953). The colorimetric estimation of formaldehyde by means of the Hantzsch reaction. Biochemical Journal, 55, 416–421.Google Scholar
- Rezaee, M., Yamini, Y., Shariati, Sh, Esrafili, A., & Shamsipur, M. (2009). Dispersive liquid–liquid microextraction combined with high-performance liquid chromatography–UV detection as a very simple, rapid and sensitive method for the determination of bisphenol A in water samples. Journal of Chromatography. A, 1216, 1511–1514.CrossRefGoogle Scholar
- Sáenz, M., Alvarado, J., Pena-Pereira, F., Senra-Ferreiro, S., Lavilla, I., & Bendicho, C. (2011). Liquid-phase microextraction with in-drop derivatization combined with microvolume fluorospectrometry for free and hydrolyzed formaldehyde determination in textile samples. Analytica Chimica Acta, 687, 50–55.CrossRefGoogle Scholar
- Salvador, A., & Chisvert, A. (Eds.). (2007). Analysis of cosmetic products. Amsterdam: Elsevier.Google Scholar