Flow injection system with gas diffusion for the sequential determination of total nitrogen and phosphorus in vegetables

José L.F.C. Lima, António O.S.S. Rangel*, M. Renata S. Souto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
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Abstract

A flow injection system was developed for the sequential determination of total nitrogen and phosphorus in digests of vegetables using potentiometric and spectrophotometric detection systems, respectively. A tubular ammonium selective electrode with a sensor system composed of nonactin/monactin in tris(2-ethylhexyl) phosphate was used. The selectivity limitations of this electrode were overcome by the inclusion of a gas-diffusion unit in the system that separated ammonium from the rest of the sample matrix and allowed the determination of total nitrogen and phosphorus by the partition of the sample plug between two streams. The results obtained with the developed FIA system were in good agreement with those of the reference methods. Sampling rates from 40 to 60 samples per hour and relative standard deviations below 3.5% were achieved.

Original languageEnglish
Pages (from-to)657-662
Number of pages6
JournalFresenius' Journal of Analytical Chemistry
Volume358
Issue number5
DOIs
Publication statusPublished - 1 Jan 1997

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