Abstract − Analytical Sciences, 16(5), 473 (2000).
A New Reagent Immobilization Method for a Portable FiberOptic Probe for Determination of Ferrous Ions
Xue-mei LIU, Wan-li XING, Guo-rong OU, and Jun LIANG
Institute of Hygiene and Environmental Medicine of Tianjin Dali Road #1, Tianjin 300050, P. R. China
An absorbance-based optic fiber probe for determination of ferrous ions is described. It is based on 4,7-diphenyl-1,10-phenanthroline as a sensitive reagent which was immobilized on polymethylmethacrylate (PMMA) using a newimmobilization method. The proposed probe responded linearly to the Fe2+ concentration in the range of 0.03 - 1.0 mg l-1.The response time required to reach a stable signal was short (less than 10 min). The probe exhibited pH and temperatureindependence, small ion interference, good selectivity, reproducibility and stability. It was applied for direct analysis ofFe2+ ions in natural water. The results were comparable to those obtained by a conventional spectrophotometric method.The results of recovery tests were also satisfactory.
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