Analytical methods for phosphorus determination in filter cake
DOI:
https://doi.org/10.1590/S0071-12761990000100009Keywords:
filter cake, phosphorus, analytical methods for analysis, colorimetric methods of analysisAbstract
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.Downloads
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Published
1990-01-01
Issue
Section
Soil Chemistry
How to Cite
Mattiazzo-Prezotto, M., & Glória, N. da. (1990). Analytical methods for phosphorus determination in filter cake . Anais Da Escola Superior De Agricultura Luiz De Queiroz, 47(1), 147-161. https://doi.org/10.1590/S0071-12761990000100009