Design of two channel flow cells for simultaneous determination of copper and iron

Two compact double and serial flow cells were designed for simultaneous det ermination of trace copper and iron ions. 2-(5-Bromo-2-pyridylazo)-5-(N-pro pyl-N-sulfopropylamino)aniline(5-Br-PSAA) was used as a chromogenic reagent . 5-Br-PSAA reacted with Cu(II) and Fe(II) to form red chelate compounds an d did not react with Cu(I) and Fe(III). Based on these characteristics, a t hree-lines flow system using two channel flow cells was assembled for the s imultaneous determination of trace amounts of copper and iron and applied t o the assay of ground water. (C) 1999 Elsevier Science B.V. All rights rese rved.