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BIBTEX RIS

Desenvolvimento de um sistema de filtração e titulação para determinação da acidez de ácidos húmicos

1999; Brazilian Chemical Society; Volume: 22; Issue: 6 Linguagem: Inglês

10.1590/s0100-40421999000600018

ISSN

1678-7064

Autores

Alexandre G. S. Prado, Sérgio Pinto de Souza, Wilson Tadeu Lopes da Silva, Maria O. de O. Rezende,

Tópico(s)

Pesticide Residue Analysis and Safety

Resumo

ACIDITY OF HUMIC ACIDS.The acidity determinations method of humic acids (HA) content was developed by Schnitzer and Gupta and is a very well known procedure.Nevertheless, care is necessary to prevent measure errors due to non-controlled BaCO 3 production, during the filtration and titration of HA total acidity.To overcome this problem, we developed in our laboratory a simple filtration and titration system for the determination of HA acidity under inert atmosphere.This system enables a better reproducibility and accuracy of total, carboxylic and phenolic acidity measures than those by Schnitzer and Gupta method.

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