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Exploiting sequential injection analysis with lab-at-valve (LAV) approach for on-line liquid-liquid micro-extraction spectrophotometry |
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| Authors: | Burakham Rodjana Lapanantnoppakhun Somchai Jakmunee Jaroon Grudpan Kate |
| Affiliation: | a Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand b Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand c Institute for Science and Technology Research and Development, Chiang Mai University, Chiang Mai 50200, Thailand |
| Abstract: | Sequential injection analysis (SIA) with lab-at-valve (LAV) approach for on-line liquid-liquid micro-extraction has been exploited. Sample, reagent and organic solvent were sequentially aspirated into a coil attached to a central port of a conventional multiposition selection valve, where the extraction process was performed. The aqueous and organic phases were separated in a conical separating chamber LAV unit attached at one port of the valve. The organic phase containing extracted product was then monitored spectrophotometrically. The system offers a novel alternative on-line automated extraction in a micro-scale and has been successfully demonstrated for the assays of diphenhydramine hydrochloride (DPHH) in pharmaceutical preparations and anionic surfactant in water samples. |
| Keywords: | Sequential injection analysis Lab-at-valve On-line liquid-liquid micro-extraction |
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