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

Alexandre G. S. Prado, Sidney M. Souza, Wilson T. Lopes da Silva, Maria O. de O. Rezende
1999 Química Nova  
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
more » ... s than those by Schnitzer and Gupta method.
doi:10.1590/s0100-40421999000600018 fatcat:znho4u2bjbcwvkdefoygyemive