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

• Main Authors: Maryam Fayazi, Masoud Ghanei-Motlagh, Mohammad Ali Taher, Raziyeh Fayazi
• Format: Article
• Language: English
• Published: Iranian Chemical Society 2016-06-01
• Series: Analytical and Bioanalytical Chemistry Research
• Subjects: Spectrometry; Magnetic activated carbon; Rhodium; Nanocomposite
• Online Access: http://www.analchemres.org/article_14570_bf208aef2eb24617a5bc9f3fcd6a444a.pdf

A new method for analysis of trace amount of Rh(III) ions by magnetic activated carbon modified with 2,3,5,6-tetra(2-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 0.8-650 µg l-1. The limit of detection (LOD, 3Sb/m) and the relative standard deviation (RSD, n = 8, c = 50 µg l-1) were 0.1 µg l-1 and 3.6%, respectively. The maximum sorption capacity of the adsorbent for rhodium was found to be 21.6 mg g-1. The presented procedure was applied to monitoring rhodium in water and synthetic samples.