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

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.

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

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.

  • Solubilidade de fosfatos naturais em solução de ácido cítrico a 2%: modificação nas condições de agitação
    R. A. Catani; D. Pellegrino

Datas de Publicação

  • Publicação nesta coleção
    10 Set 2012
  • Data do Fascículo
    1960

Histórico

  • Recebido
    29 Out 1960
Universidade de São Paulo, Escola Superior de Agricultura Av.Páduas Dias, 11, C.P 9 / Piracicaba - São Paulo, Brasil, tel. (019)3429-4486, (019)3429-4401 - Piracicaba - SP - Brazil
E-mail: scientia@esalq.usp.br