Directly suspended droplet microextraction in combination with microvolume UV-vis spectrophotometry for determination of phosphate |
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| Authors: | Pena-Pereira Francisco Cabaleiro Noelia de la Calle Inmaculada Costas Marta Gil Sandra Lavilla Isela Bendicho Carlos |
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| Institution: | Departamento de Química Analítica y Alimentaria, Área de Química Analítica, Facultad de Química, Universidad de Vigo, Campus As Lagoas-Marcosende s/n, 36310 Vigo, Spain |
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| Abstract: | A miniaturized methodology for the determination of phosphate in waters has been developed by combining directly suspended droplet microextraction (DSDME) with microvolume spectrophotometry. The method is based on the extraction of the ion pair formed between 12-molybdophosphate and malachite green onto a microdrop of methyl isobutyl ketone and subsequent spectrophotometric determination with no dilution. An enrichment factor of 325 was obtained after 7.5 min of microextraction. The detection limit was 6.1 nM phosphate and the repeatability, expressed as relative standard deviation, was 2.7% (n = 6). The method was successfully applied to the determination of dissolved reactive phosphorus in different freshwater samples. |
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| Keywords: | Directly suspended droplet microextraction Microvolume spectrophotometry Phosphate Dissolved reactive phosphorus Preconcentration |
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