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Pneumatic flow injection analysis-tandem spectrometer system for iron speciation
Meissam Noroozifar1, Mozhgan Khorasani-Motlagh, Reza Akbari
1Analytical Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, Zahedan, P.O. Box 98165-181, Iran. mnoroozifar@hamoon.usb.ac.ir
Summary
A novel pneumatic flow injection system without a pump simplifies iron speciation. This method accurately determines iron(II) and iron(III) in various water samples, offering a precise and efficient analytical approach.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Accurate iron speciation is crucial for understanding water quality and environmental processes.
- Traditional methods for iron speciation can be complex and time-consuming.
Purpose of the Study:
- To develop and validate a simplified pneumatic flow injection-tandem spectrometer system for iron speciation.
- To determine iron(II) and iron(III) concentrations in environmental and industrial water samples.
Main Methods:
- Utilized a pneumatic nebulizer's suction force for solution delivery, eliminating the need for a separate delivery pump.
- Employed UV-Vis spectrometry with thiocyanate for Fe(III) determination and Flame Atomic Absorption Spectrometry (FAAS) for total Fe.
- Calculated Fe(II) concentration by subtracting Fe(III) from total Fe.
Main Results:
- Achieved linear calibration curves up to 18 µg/mL (Fe(III)) and 25 µg/mL (Fe(II)).
- Obtained detection limits of 0.09 µg/mL for Fe(III) and 0.07 µg/mL for Fe(II).
- Demonstrated high precision (<2.5%) and accuracy (+/-3%) at a sampling rate of 120 h⁻¹.
Conclusions:
- The developed pump-less pneumatic flow injection system provides an efficient and accurate method for iron speciation.
- The system is suitable for the determination of Fe(II) and Fe(III) in diverse water matrices, including industrial and natural waters.