Desenvolvimento de um sistema de filtração e titulação para determinação da acidez de ácidos húmicos
Open Access
- 1 December 1999
- journal article
- Published by FapUNIFESP (SciELO) in Química Nova
- Vol. 22 (6) , 894-896
- https://doi.org/10.1590/s0100-40421999000600018
Abstract
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 methodKeywords
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