title: A simple flow injection system with bead injection for trace iron determination.
abstract: A simple and low cost flow injection (FI) system with bead injection (BI) was developed for determination of low concentration (mumol l(-1)) of iron in water samples. Chelex-100 chelating resin beads, trapped in a jet ring cell, were employed. The intensity of red complex of 1,10-phenanthroline with Fe(2+) was monitored using colorimetric detector with a LED green light source. Amount of total Fe (Fe(2+) and Fe(3+)) and Fe(2+) can be evaluated by with and without reduction of Fe(3+) using ascorbic acid. Lowest detectable levels of Fe(2+) were 0.90 and 0.45 mumol l(-1) for sample loading time of 3 and 5 min, respectively. Working range was up to 3.90 mumol l(-1) using 0.3% w/v 1, 10-phenanthroline. Percent recoveries of spiked water samples (0.90-2.33 mumol l(-1) of Fe(2+)) were 100-110%.
authors.affiliation: Department of Chemistry, Faculty of Science and Institute for Science and Technology Research and Development, Chiang Mai University, Chiang Mai 50200, Thailand.
authors.forename: K
authors.initials: K
authors.lastname: Jitmanee
authors.forename: S Kradtap
authors.initials: SK
authors.lastname: Hartwell
authors.forename: J
authors.initials: J
authors.lastname: Jakmunee
authors.forename: S
authors.initials: S
authors.lastname: Jayasvasti
authors.forename: J
authors.initials: J
authors.lastname: Ruzicka
authors.forename: K
authors.initials: K
authors.lastname: Grudpan