Flow injection analysis with in-line solid phase extraction for the spectrophotometric determination of sulfonated and unsulfonated Quinoline Yellow in Cologne |
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Authors: | L F Capitán-Vallvey M C Valencia E Arana Nicolas |
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Institution: | (1) Department of Analytical Chemistry, University of Granada, E-18071 Granada, Spain e-mail: lcapitan@goliat.ugr.es, ES |
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Abstract: | An integrated solid-phase spectrophotometry/ FIA method is proposed for the determination of the synthetic colorant matter
Quinoline Yellow (QYWS) in the presence of its unsulfonated derivative QYSS. The procedure is based on the retention and preconcentration
of the low level QYSS on a C-18 silica gel minicolumn, followed by sequential measurement of its absorbance at λ = 410 nm
after its elution with methanol. The applicable concentration range, the detection limit and the relative standard deviation
were the following: for QYWS, from 0.10 to 30.0 mg L–1; 0.013 mg L–1; and 0.6%; and for QYSS, between 10 and 1,000 μg L–1; 2 μg L–1; and 1.3%, respectively. The method was applied to the determination of small amounts of QYSS present in QYWS in Colognes.
Percentages of recovery between 98% and 99% were obtained in all instances. The method was also satisfactorily applied to
the determination of these compounds in samples of commercial Colognes comparing the results for QYWS with those offered by
an HPLC reference method and also validating the results chemometrically.
Received: 21 January 2000 / Revised: 17 March 2000 / Accepted: 22 March 2000 |
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