Solubilidade de fosfatos naturais em solução de ácido cítrico a 2%: modificação nas condições de agitação

Catani, R. A.; Pellegrino, D.

doi:10.1590/S0071-12761960000100022

Resumo

This paper deals with a modification in the solubilization technique of natural phophates in the 2% citric acid solution. The proposed technique is as follows: 2,5 g of phosphatic material and 250 ml of 2% citric acid solution, in a 500 ml Erlenmeyer flask, are shaken for 30 minutes at 30-40 rpm. The phosphorus (P2O5) was determined by the usual method. The data obtained were compared with the conventional technique in which a Stohmann bottle is used. The natural phosphates used were: Phosphorita de Olinda (Pernambuco), Flórida Phosphate (USA) and Hiperphosphate (África). Statistical analysis was applied to the data and the following conclusions were arrived at: a) The precision is equivalent in both techniques. b) There is no significant variation between the means obtained with the two technique.

Escola Superior de Agricultura «Luiz de Queiroz»

SUMMARY

This paper deals with a modification in the solubilization technique of natural phophates in the 2% citric acid solution. The proposed technique is as follows: 2,5 g of phosphatic material and 250 ml of 2% citric acid solution, in a 500 ml Erlenmeyer flask, are shaken for 30 minutes at 30-40 rpm. The phosphorus (P₂O₅) was determined by the usual method. The data obtained were compared with the conventional technique in which a Stohmann bottle is used.

The natural phosphates used were: Phosphorita de Olinda (Pernambuco), Flórida Phosphate (USA) and Hiperphosphate (África).

Statistical analysis was applied to the data and the following conclusions were arrived at:

a) The precision is equivalent in both techniques.

b) There is no significant variation between the means obtained with the two technique.

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LITERATURA CITADA

Recebido para publicação em 29/10/1960.

CATANI, R. A. & A. C. NASCIMENTO - 1952 - A solubilidade de alguns fosfatos naturais. Rev. de Agr. Piracicaba) 27:149-168.
CATANI, R. A. & A. C. NASCIMENTO - 1954 - Influência do gráu de finura na solubilidade de fosfatos naturais - Revista da Agricultura 29: 5-14.