Resumos
Ao realizarem este trabalho os autores tiveram em mente verificar os efeitos das frações granulométricas do solo sobre a fixação de Zn pelo mesmo. Utilizaram, para tanto, uma técnica traçadora, sendo o 65Zn o elemento traçador. Concluíram que as frações argila e limo participam do fenômeno, mas não a fração areia.
This paper was carried out in order to verify the effects of the clay, silt and sand soil fractions on zinc fixation by soils. Ten grams each of 30 samples of different soils were placed in a 250 ml Erlenmeyer flask and 4 ml of solution containing 100 mg of inert Zn and 0.70 mc of radioactive 65Zn were added. After 20 days of incubation, Zn was extracted with 20 ml of 0.01 M EDTA solution made 1 M with respect to (NH4)2CO3. An aliquot of 5 ml of the extract was transferred to a test-tube and radioactivity of 65Zn in it was measured with a scintillation counter. Quantity of fixed Zn by the different soils was calculated from the data obtained and counting made on the standard solution. It was concluded that clay and silt took part of the Zn fixation by the soil, but not the sand.
Influência das frações granulométricas sobre a fixação de zinco pelo solo* * Os autores são gratos aos Profs. E. Malavolta e A. Cervellini pelo fornecimento do 65Zn e pela permissão do uso das dependências e aparelhos do CENA, respectivamente.
Effect of the granulometric fractions on the fixation of zinc by soils
Ronaldo I. SilveiraI; M.O.C. do Brasil SobrinhoI; F.A.F. de MelloI; S. ArzollaI; J.R. SarrugeII
IDepartamento de Solos da E.S.A. "Luiz de Queiroz"
IIDepartamento de Química da E.S.A. "Luiz de Queiroz"
RESUMO
Ao realizarem este trabalho os autores tiveram em mente verificar os efeitos das frações granulométricas do solo sobre a fixação de Zn pelo mesmo. Utilizaram, para tanto, uma técnica traçadora, sendo o 65Zn o elemento traçador.
Concluíram que as frações argila e limo participam do fenômeno, mas não a fração areia.
SUMMARY
This paper was carried out in order to verify the effects of the clay, silt and sand soil fractions on zinc fixation by soils.
Ten grams each of 30 samples of different soils were placed in a 250 ml Erlenmeyer flask and 4 ml of solution containing 100 mg of inert Zn and 0.70 mc of radioactive 65Zn were added. After 20 days of incubation, Zn was extracted with 20 ml of 0.01 M EDTA solution made 1 M with respect to (NH4)2CO3. An aliquot of 5 ml of the extract was transferred to a test-tube and radioactivity of 65Zn in it was measured with a scintillation counter. Quantity of fixed Zn by the different soils was calculated from the data obtained and counting made on the standard solution.
It was concluded that clay and silt took part of the Zn fixation by the soil, but not the sand.
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LITERATURA CITADA
Entregue para publicação em 6/10/1975.
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Datas de Publicação
-
Publicação nesta coleção
30 Maio 2012 -
Data do Fascículo
1975
