Focused microwave-assisted procedure for micronutrient extraction from soil samples with DTPA solution

Author(s)

M. C. C. Lombardi ^[1] ; J. A. Nóbrega ^[2] ; A. R. A. Nogueira ^[3]

Affiliation

^[1] Universidade Federal de São Carlos - UFSCar. Departamento de Química

^[2] UFSCar. Departamento de Química

^[3] Embrapa Pecuária Sudeste

• Document type: Journal article
• Source: Revista Brasileira de Ciência do Solo; v. 26, n. 3, p. 789-794, 2002-09-00.

Abstract

This study presents an alternative procedure for the extraction of micronutrients from soil samples for fertility evaluation. Samples from an interdisciplinary program for soil analysis with different physical and chemical characteristics were subjected to DTPA extraction using focused microwave radiation energy. The microwave-assisted procedure (10 min) proved to be remarkably time-saving for Cu, Mn, and Zn extraction when compared to the time consume of conventionally prepared samples (120 min), using mechanical stirring at room temperature. The development of a single procedure for simultaneous extraction of Fe was not possible, however, due to excessive Fe release during the heating process. Nevertheless, the feasibility of microwave-assisted procedures in routine analyses was validated. (AU)

• FAPESP's process: 98/10814-3 - Preparation of agronomic samples and multi-elementary determination by induced plasma atomic emission spectrometry
• Grantee: Joaquim de Araújo Nóbrega
• Support Opportunities: Research Projects - Thematic Grants