Determination of Rhodium(III) Ions by Flame Atomic Absorption Spectrometry after Preconcentration with Modified Magnetic Activated Carbon

A new method for analysis of trace amount of Rh(III) ions by magnetic activated carbon modified with ۲,۳,۵,۶-tetra(۲-pyridyl)pyrazine (MAC/TPPZ) as the magnetic sorbent has been proposed. The proposed adsorbent was found to be advantageous over conventional solid phase extraction (SPE) in terms of operational simplicity and low time-consuming. The experimental parameters affecting the extraction/preconcentration and determination of the analyte were systematically examined. In order to investigate the selectivity of this magnetic sorbent, the effect of a variety of ions on preconcentration and recovery of Rh(III) ions were also investigated. Under optimum conditions, the calibration graph was linear for the concentration range of ۰.۸-۶۵۰ µg l-۱. The limit of detection (LOD, ۳Sb/m) and the relative standard deviation (RSD, n = ۸, c = ۵۰ µg l-۱) were ۰.۱ µg l-۱ and ۳.۶%, respectively. The maximum sorption capacity of the adsorbent for rhodium was found to be ۲۱.۶ mg g-۱. The presented procedure was applied to monitoring rhodium in water and synthetic samples.

Keywords:

Spectrometry , Magnetic activated carbon , Rhodium , Nanocomposite