%0 Journal Article
%T Determina£¿£¿o das v¨¢rias formas de f¨®sforo em tortas de filtro rotativo
%A Mattiazzo-Prezotto
%A M.E.
%A Gl¨®ria
%A N.A. da
%J Anais da Escola Superior de Agricultura Luiz de Queiroz
%D 1990
%I Scientific Electronic Library Online
%R 10.1590/S0071-12761990000100009
%X this paper describes analytical methods for determining the various phosphorus fractions in filter cake. these fractions can be classified as to their solubility in several extractants: water; 2% citric acid; neutral ammonium citrate; 0,5 n sulfuric acid. all procedures employed colorimetric methods, using the reagents according to the needed sensitivity. the metodology for the determination of total phosphorus after a dry solubilization procedure is described as well as the methodology for organic phosphorus determination. the inorganic phosphorus predominate in the samples with a range of 2,3 to 0,8%, depending on the origin and harvesting period. the best procedure was the analysis of the cake in its natural condition (moist cake) using the extraction by 2% citric acid solution.
%K filter cake
%K phosphorus
%K analytical methods for analysis
%K colorimetric methods of analysis.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0071-12761990000100009&lng=en&nrm=iso&tlng=en