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|Type:||Artigo de periódico|
|Title:||Rapid Determination Of Zinc And Iron In Foods By Flow-injection Analysis With Flame Atomic-absorption Spectrophotometry And Slurry Nebulization|
|Author:||de Andrade J.C.|
Strong III F.C.
|Abstract:||A rapid method of determining zinc and iron in food by flame atomic-absorption spectrophotometry with slurry nebulization into an air-acetylene flame has been developed. A V-groove, clog-free Babington-type nebulizer, coupled to a single-line flow-injection analysis (FIA) system, was employed to introduce the slurry into the spray chamber. Under the FIA conditions described, an injection frequency of 120/hr is possible, with negligible carry-over and memory effects. The calibration graphs were obtained by using various concentrations (up to 0.1 g/ml) of white bean homogenate as standards, rather than solutions. The method has been applied to various kinds of foods, including grains, vegetables, fruits and sausage. Homogenization of semi-prepared samples to form slurries took only 4 min. Relative deviations between results by the slurry and solution methods for both elements averaged 2-3%. Detection limits by the slurry method were 0.3 μg/ml Zn and 0.6 μg/ml Fe. © 1990.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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