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

• Author(s): Prado,Alexandre G. S. ; Souza,Sidney M. ; Silva,Wilson T. Lopes da ; Rezende,Maria O. de O.
• Date: 1999
• Origin: Oasisbr
• Subject(s): humic acids; acidity; titration method
• Document Type: Report
• Language: Portuguese

Description

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 BaCO3 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.