Resumo
Studying the application of those methods of microanalysis which avoid costly instalations and atempting to combine high precision with low cost, the author recomends a new method consisting of the following : a) exposure of a surface of 530.66 mm2 of Zn to the action of the acid. b) instalation of 3 series of HgBr2 paper in test tubes with an internal diameter of respectively 3,5 and 9 mm. c - mouting between two slides, covering the margins (with parafin etc.) with parafin in order to conserve the results of the determination without change due to the action of light or moisture. d) the results can be compared at a level of 0.00001 mgr. A203 or 0.000007575 mgr. As.
Microdeterminação do arsênico(* (* ) O sutor consigna aqui, seus agradecimentos às sugestões do Prof. Di José de Mello Moraes, sob cuja orientação geral este trabalho foi.fei to. Agradece também a valiosa colaboração do seu auxiliar d* labo ratório Armando Porta. )
Guido Ranzani
Assistente da 2.a Cadeira - Química Agrícola
SUMMARY
Studying the application of those methods of microanalysis which avoid costly instalations and atempting to combine high precision with low cost, the author recomends a new method consisting of the following :
a) exposure of a surface of 530.66 mm2 of Zn to the action of the acid.
b) instalation of 3 series of HgBr2 paper in test tubes with an internal diameter of respectively 3,5 and 9 mm.
c - mouting between two slides, covering the margins (with parafin etc.) with parafin in order to conserve the results of the determination without change due to the action of light or moisture.
d) the results can be compared at a level of 0.00001 mgr. A203 or 0.000007575 mgr. As.
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BIBLIOGRAFIA
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Datas de Publicação
-
Publicação nesta coleção
06 Fev 2013 -
Data do Fascículo
1947
