Multi-syringe flow injection system with in-line microwave digestion for the determination of phosphorus

M. Inês G.S. Almeida, Marcela A. Segundo, José L.F.C. Lima, António O.S.S. Rangel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

A multi-syringe system for spectrophotometric determination of total phosphorus involving in-line digestion is proposed. Sample and digestion solution were dispensed and directed towards a digestion vessel located inside a domestic microwave oven (MWO) where sample digestion took place. Afterwards, the digested sample was merged with the necessary reagents for the colorimetric determination based on the molybdenum blue method. Several digestion conditions were studied regarding composition of digestion solution, digestion time and power set on the MWO. The system was applied to waste water samples and results shown a good agreement with the reference method. Repeatable results (R.S.D.<2.41%) and determination frequency of 12 h-1 were obtained.

Original languageEnglish
Pages (from-to)1283-1289
Number of pages7
JournalTalanta
Volume64
Issue number5
DOIs
Publication statusPublished - 15 Dec 2004

Keywords

  • In-line digestion
  • Microwave
  • Multi-syringe flow analysis
  • Total phosphorus
  • Waste waters

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