Total phosphorus determination in aquatic plants using an ignition method

Rinaldo J. S. Rocha; Marcela Bianchessi Cunha-Santino; Jurity A. M. Milan; irineu Bianchini Junior

doi:10.4025/revtecnol.v23i1.17469

Authors

Rinaldo J. S. Rocha Programa de Pós Graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Light Energia. Av. Marechal Floriano, 168. CEP 20080-002 Caixa Postal 0571. Rio de Janeiro – RJ, Brasil Author
Marcela Bianchessi Cunha-Santino Programa de Pós Graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Departamento de Hidrobiologia, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Author
Jurity A. M. Milan Departamento de Hidrobiologia, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Author
irineu Bianchini Junior Programa de Pós Graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Departamento de Hidrobiologia, Universidade Federal de São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos – SP, Brasil. Author

DOI:

https://doi.org/10.4025/revtecnol.v23i1.17469

Keywords:

aquatic macrophytes, elemental composition, Ribeirão das Lajes Reservoir.

Abstract

It is proposed the use of ignition method to replace the digestion procedure in the total phosphorus quantification for aquatic macrophytes and its detritus. The remaining material from decomposition experiment was dried and submitted to ignition (550 ºC; 2 h). The same samples had their phosphorous contents quantified by colorimetric method that includes previous acid digestion. The phosphorous contents were also measured in the ash derived from ignition. For all samples (n = 104), the ignition method was less efficient, the average of global yield was 14.2%. The equivalence between these two procedures is stressed by the linear relationship with high r2 value (0.95).