Use of U-isotope disequilibrium to evaluate the weathering rate and fertilizer-derived uranium in São Paulo state, Brazil


Autoria(s): Conceicao, F. T.; Bonotto, Daniel Marcos
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/07/2003

Resumo

The U-disequilibrium method was utilized to evaluate the velocity of alteration of rocks and fertilizer-derived uranium in the Corumbatai River basin, São Paulo state, Brazil. The Corumbatai River basin is affected by the continuous use of fertilizer-derived uranium utilized in sugar cane crops, increasing the dissolved uranium concentration in the Corumbatai River (Santa Terezinha station) in the wet period to 43%. The weathering rate in the Corumbatai River basin utilizing the U-isotope modeling was 0.0265 mm/year (corresponding to 38,000 years to weather 1 m of rock under actual climatic conditions). However, when the inputs of anthropogenic uranium were considered, then a weathering rate of 0.022 mm/year (corresponding to 45,500 years to weather 1 m of rock) was determined. The removed material in the Corumbatai River basin is mainly from two sub-basins (the Cabecas River and Passa Cinco River), where the sandstones weather easier than the siltstones and claystones in the basin.

Formato

408-418

Identificador

http://dx.doi.org/10.1007/s00254-003-0775-4

Environmental Geology. New York: Springer-verlag, v. 44, n. 4, p. 408-418, 2003.

0943-0105

http://hdl.handle.net/11449/36014

10.1007/s00254-003-0775-4

WOS:000184074700005

Idioma(s)

eng

Publicador

Springer

Relação

Environmental Geology

Direitos

closedAccess

Palavras-Chave #weathering rate #uranium #phosphate and anthropogenic influences #Brazil
Tipo

info:eu-repo/semantics/article