Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1242382 | Talanta | 2011 | 5 Pages |
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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Francisco Pena-Pereira, Noelia Cabaleiro, Inmaculada de la Calle, Marta Costas, Sandra Gil, Isela Lavilla, Carlos Bendicho,