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Article
Flow injection reagent introduction by supported liquid and nafion membranes: Determination of phosphate
Talanta (1994)
  • Julian Tyson
  • Stuart J. Chalk
Abstract
The use of membrane tubing for the introduction of reagents for the determination of
phosphate in waters by flow injection analysis was studied. The use of membranes eliminates the need
for confluence points in the design of flow injection manifolds. This increases the sensitivity of the manifold
by providing a sufficient reagent excess for the reaction without diluting the sample. Methods for the
introduction of acid, molybdate and hydrazine were devised for the determination of phosphate by the
Molybdenum Blue method. Several membranes were examined and Nafion and Accurel (microporous
polypropylene) were found to be most useful. Molybdate introduction was achieved using a supported
liquid membrane (SLM). Calibration was linear and a detection limit of 12 ppb phosphate (4 ppb
phosphorus) was obtained.
Keywords
  • Flow injection,
  • reagent introduction,
  • support liquid,
  • nafion membranes,
  • phosphate
Publication Date
1994
Citation Information
Julian Tyson and Stuart J. Chalk. "Flow injection reagent introduction by supported liquid and nafion membranes: Determination of phosphate" Talanta Vol. 41 (1994) p. 1797 - 1805
Available at: http://works.bepress.com/julian_tyson/94/