Colorimetric determination of phosphorus in milk by flow injection analysis using a thermal/UV induced digestion

M. J. Reis Lima, S. M. V. Fernandes, A. O. S. S. Rangel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Two flow injection systems for the determination of total phosphorus in milk were developed: one for the determination of phosphorus using off-line digestion of milk and another with in-line digestion. The first procedure involves a classical Kjeldahl digestion of milk prior to introducing it into the flow system; the second uses acid, heat and UV-catalysed peroxodisulphate oxidation to convert in-line all forms of phosphorus compounds into orthophosphate, allowing a considerable amount of time to be saved. Concentrations of phosphorus in milk within the range of 706 to 984 mg P/L were found and FIA results were in good agreement with those provided by the reference method.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalItalian Journal of Food Science
Volume14
Issue number1
Publication statusPublished - 1 Jan 2002

Keywords

  • Flow-injection
  • In-line UV/thermal digestion
  • Milk
  • Phosphorus determination
  • Spectrophotometry

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