Analytical Sciences

Pneumatic Flow Injection Analysis-Tandem Spectrometer System for Iron Speciation

Meissam NOROOZIFAR,* Mozhgan KHORASANI-MOTLAGH,** and Reza AKBARI*

*Analytical Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, Zahedan, P. O. Box 98165-181, Iran
**Inorganic Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, Zahedan, Iran

A pneumatic flow injection-tandem spectrometer system, without a delivery pump was used for the speciation of iron. In this system, the suction force of a pneumatic nebulizer of a flame absorption spectrometer was used for solution delivery through the manifold. The Fe(III) and total Fe concentrations were determined using thiocyanate ion in a UV-Vis spectrometer and a FAAS, respectively. The Fe(II) was determined by the difference. The calibration curves were linear up to 18 µg mL^-1 and 25 µg mL^-1 with detection limits of 0.09 µg mL^-1 and 0.07 µg mL^-1 for Fe(III) and Fe(II), respectively. The mid-range precision and accuracy were <2.5% and ±3% for the two species, respectively, at a sampling rate of 120 h^-1. This system was applied for the determination of Fe(III) and Fe(II) in industrial water, natural water and spiked samples.

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