Dinâmica do cromo em solos fertilizados com proteína hidrolisada de couro / Dynamics of chromium in soil fertilized with leather hydrolysate

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2012

RESUMO

This study intends to subsidize the decision for utilizing leather hidrolysate as fertilizer in the state of Rio Grande do Sul. The distribution and potential mobility of chromium in different soils, applied in increasing amounts of leather hidrolysate were investigated. The analyses involved sequential fractioning procedure and speciation of chromium, in addition to the physico-chemical characterization of soils. Further tests of leaching with water were performed to evaluate forms and quantities of the metals released from the treated soils. The analytical methods used have shown adequate accuracy, precision and detection limits. The Cr(VI) content in fertilized soil and in the leachate was below the limit of analytical detection. The results of sequential extraction revealed changes in the partition of chromium in the phases of the soils fertilized with leather hidrolysate, when compared with samples used as references. For all the soils and applied doses, the chromium occurred preferentially in oxidizable fraction, probably in the trivalent form. The results indicated that the chromium present in the leather hidrolysate may have a different environmental impact depending on the characteristics of the soil and the amount applied. Depending on the amount applied, over time, the chromium accumulated can overcome the guidance values established by the legislation currently in use for Brazilian soils. Although the data obtained must be interpreted with care and in the context of many observations, such as soil charactheristics and limitations of the analytical methods employed, this study generated useful information on the origin, chemical form, distribution and potential availability of chromium from the soils evaluated.

ASSUNTO(S)

quimica do solo cromo fertilidade do solo

ACESSO AO ARTIGO

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