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Type: Artigo de periódico
Title: The effects of the DTPA extraction conditions on the determination of micronutrients in Brazilian soils
Author: deAbreu, CA
deAbreu, MF
Soares, LH
deAndrade, JC
Abstract: Extraction steps of the DTPA procedure for copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) determinations were tested in four representative soils from the State of Sao Paulo (Brazil), namely Red-Yellow Latosol (LV), Red-Yellow Podzolic (PV), Dusk-Red Latosol (LR), and Sand Soil (AQ). The results indicated that the use of volume sampling, although possible, may cause biased results. Thus, direct soil sampling in terms of mass is recommended. Variations in the pH of the extraction solution from 7.1 to 7.5 can be critical for acid soils, but the best results for the soils tested were observed by keeping the extraction solution pH at 7.3. Some sort of equilibrium seems to be reached after a soil/extraction solution shaking time of 150 min for all soils tested. No significant changes in the micronutrient concentrations are observed if the soil suspension is filtered up to 120 min after shaking, but changes may occur upon storing the filtrate for more than 7 days at temperatures of 25 degrees C-30 degrees C.
Editor: Marcel Dekker Inc
Rights: fechado
Identifier DOI: 10.1080/00103629709369767
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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