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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Rev. Bras. Ciênc. Solo vol.25 no.4 Viçosa Oct./Dec. 2001

http://dx.doi.org/10.1590/S0100-06832001000400027 

SEÇÃO IX - POLUIÇÃO DO SOLO E QUALIDADE AMBIENTAL

 

Adsorção e lixiviação de tebuthiuron em três tipos de solo(1)

 

Tebuthiuron adsorption and mobility in three brazilian soils

 

 

M. Dornelas De Souza; R. C. Boeira; M. A. F. Gomes; V. L. Ferracini; A. H. N. Maia

Pesquisador(a) - Embrapa Meio Ambiente. Caixa Postal 69, CEP 13820-000 Jaguariúna (SP). E-mail: dornelas@cnpma.embrapa.br

 

 


RESUMO

Estudou-se a adsorção do herbicida tebuthiuron em três solos de Ribeirão Preto (SP): Latossolo Vermelho distrófico (LVd), Latossolo Vermelho distroférrico (LVdf) e Neossolo Quartzarênico (RQ). Ajustaram-se isotermas de adsorção por meio de quatro modelos: linear, Freundlich, Lambert e Langmuir, para duas profundidades: 0-10 cm e 10-20 cm. Nos três tipos de solo, o melhor ajuste foi obtido com o modelo de Freundlich, escolhido com base nos seguintes critérios estatísticos: quadrado do coeficiente de correlação entre valores observados e preditos (R2), quadrado médio do erro (QME), dispersão de resíduos padronizados e gráficos de probabilidade normal. Os coeficientes de partição do herbicida calculados com base em todo o solo (Kd) ou com base no seu teor de carbono orgânico (KOC) ou de matéria orgânica (KOM) variaram de 0,723 a 2,573; de 135,4 a 374,3 e de 78,4 a 218,3 L kg-1, respectivamente, tendo ocorrido correlação significativa entre os valores de Kd e teor de carbono orgânico dos solos e teor de argila. Efetuou-se um teste de lixiviação em colunas, no qual se observou movimento do herbicida até à profundidade de 60 cm no RQ, 20 cm no LVd e 10 cm no LVdf, verificando-se uma relação inversa entre a profundidade alcançada pelo produto e o valor de Kf de Freundlich utilizado como estimador de Kd.

Termos de indexação: isotermas de adsorção, herbicida, Latossolo, Neossolo Quartzarênico, solos tropicais.


SUMMARY

Tebuthiuron adsorption was determined in samples from 0-10 to 10-20 cm layers of three soils from the county of Ribeirão Preto (SP)-Brazil: Quartzarenic Neosol (Entisol), Red Latosol dystrofic and Red Latosol dystroferric (Oxisols). Sorption data were obtained by batch equilibrium and fitted to four adsorption models: Freundlich, linear, Langmuir and Lambert. Several statistical criteria were applied for selection among these isotherms. Freundlich model showed the best fit to the data. Kd values ranged from 0.723 to 2.573 L kg-1, and were correlated to organic carbon (OC) and clay content; KOC values ranged from 135.4 to 374.3 L kg-1. Tebuthiuron mobility was evaluated in soil-packed columns under laboratory conditions and detected at the depths of 60 cm in the Quartzarenic Neosol, 20 cm in the Red Latosol dystrofic and 10 cm in the Red Latosol dystroferric, its leaching being inversely related to Kf values.

Index terms: adsorption isotherms, herbicide, leaching, sandy soil, oxisol, tropical soils.


 

 

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Recebido para publicação em setembro de 1998
Aprovado em maio de 2001

 

 

(1) Trabalho realizado com recursos da Embrapa.

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