2014
DOI: 10.1016/j.aca.2014.04.049
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Liquid–liquid microextraction in a multicommuted flow system for direct spectrophotometric determination of iodine value in biodiesel

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Cited by 20 publications
(18 citation statements)
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“…A biodiesel sample with acid number (0.6 mg KOH g −1 ) previously determined by the reference procedure [14] (reference sample) was used for the optimization of the procedure. Considering that there is no reference biodiesel with certified value of acid number, calibration solutions were prepared by dilution of the reference sample in hexane (Tedia, Rio de Janeiro, Brazil), as previously adopted for the determination of iodine value [21]. This solvent was previously washed with ultrapure water in order to remove remaining acids.…”
Section: Chemicals and Solutionsmentioning
confidence: 99%
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“…A biodiesel sample with acid number (0.6 mg KOH g −1 ) previously determined by the reference procedure [14] (reference sample) was used for the optimization of the procedure. Considering that there is no reference biodiesel with certified value of acid number, calibration solutions were prepared by dilution of the reference sample in hexane (Tedia, Rio de Janeiro, Brazil), as previously adopted for the determination of iodine value [21]. This solvent was previously washed with ultrapure water in order to remove remaining acids.…”
Section: Chemicals and Solutionsmentioning
confidence: 99%
“…However, flow injection liquid-liquid microextraction is a feasible strategy that has been demonstrated in the literature [19][20][21]. Microextraction is based on the non-exhaustive analyte transference from large amounts of sample to micro portions of an acceptor phase [19,22].…”
Section: Introductionmentioning
confidence: 99%
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“…Microextractions have been also usual in flow analysis because of the capability to carry out partial yet reproducible analyte extractions. For example, this process was exploited for the determination of the iodine value in biodiesel, 43 which indicates the unsaturation degree and thus the oxidative stability of the biofuel. With a multicommuted flow system, an aqueous triiodide solution was intercalated between two biodiesel aliquots.…”
Section: Looking Backward: the Impact Of Flow Analysis On Analytical mentioning
confidence: 99%
“…Furthermore, environmentally friendly systems and highly sensitive analyses have been achieved 9,12,22 . Additional advantages of the micro-pumps in a multicommutation system include portability, low energy requirements and the ability to minimize volume reagent consumed and consequently waste generation 23,24 . The association of interface liquid-liquid (extraction or diffusion) with MCFIA has been employed for the determination of molybdenum 25 31 .…”
Section: Introductionmentioning
confidence: 99%