Saleh, Mayra A.D. [UNESP]Neves, Renato C.F. [UNESP]Moraes, Paula M. [UNESP]Lima, Paula M. [UNESP]Santos, Felipe A. [UNESP]Silva, Fábio A. [UNESP]Padilha, Pedro M. [UNESP]2014-05-272014-05-272009-01-01Sensing and Instrumentation for Food Quality and Safety, v. 3, n. 2, p. 108-113, 2009.1932-75871932-9954http://hdl.handle.net/11449/70879This paper proposes a method to determine iron in samples of fish feed and feces using ultrasound in the extraction of the analyte and in subsequent quantification by flame atomic absorption spectrometry. Using HCl 0.10 mol L -1 as the extraction solution, the optimal conditions of extraction were found to be: granulometry of the sample <60 μm; a sonication time of five cycles of 10 s and sonication power of 136 W. The method was applied in studies of the availability of iron in four food sources used in the diet of Nile Tilapia. The results obtained with the proposed extraction method allowed us to calculate the coefficients of apparent digestibility of iron in the food sources, which was not possible when using results obtained from samples mineralized by acid digestion. © Springer Science+Business Media, LLC 2008.108-113engAcid mineralizationAvailability of ironFAASUltrasound extractionAcid digestionsAnalyteExtraction methodsExtraction solutionsFish feedsFlame atomic absorption spectrometriesFood sourcesGranulometryIron determinationsNile tilapiasOptimal conditionsUltrasound-assisted extractionsAbsorption spectroscopyAcidsAcoustic wavesAtomic absorption spectrometryAtomic spectroscopyMineralogyUltrasonicsWastewater treatmentExtractionArtigo10.1007/s11694-008-9066-9Acesso restrito2-s2.0-67349280666698144863745639135891372643644560000-0003-4179-05740000-0001-7264-3396