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6795310 
Journal Article 
Evaluation of Tessier, Keller and Miller sequential extraction methods in the determination of native iron in three types of soil: Histosol, oxisol, and mollisol 
La, OR; Barra, CM; Sobrinho, N; Mazur, N; Velloso, ACX; , 
2003 
SOC BRASILEIRA QUIMICA 
SAO PAULO 
323-330 
WOS:000183414900006 
EVALUATION OF TESSIER, KELLER AND MILLER SEQUENTIAL EXTRACTION METHODS IN THE DETERMINATION OF NATIVE IRON IN THREE TYPES OF SOIL: HISTOSOL, OXISOL, AND MOLLISOL. Sequential extraction is not totally effective to dissolve distinct forms of trace elements. The extractive solution, for example, can dissolve less of the target fraction and more than another not wished fraction. The goal of this work is to compare the extraction of native iron with three sequential extraction methods of the heavy metals, using three soils with different physical chemistry characteristics: a histosol, an oxisol, and a mollisol. The results obtained in this work demonstrate that a smaller relation soil/extractor results in a larger extraction in almost all phases. The use of many stages of the sequential extraction, with the purpose of more association of the metal with different components of the soil, can result, among other things, in modification of the substratum by the action of the reagents used, besides reducing the selectivity of the more specific extractors. Readsorption and redistribution of the heavy metals could have happened with larger intensity in the fraction where hidroxilamine was used with higher temperature. Sequential extraction of iron, without enrichment of soil samples, in the respective fractions in each method, it was important to better understand the behavior of the reagents considered specific to each form of the metal in soil. 
26th Annual Meeting of the Sociedad-Brasileira-de-Quimica 
POCOS DE CALDAS, BRAZIL