Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7642406 | Microchemical Journal | 2016 | 46 Pages |
Abstract
This report described the use of amine-functionalized mesoporous silica UVM-7 as nanoadsorbent in ultrasound assisted-dispersive-micro-solid phase extraction (US-D-μ-SPE) procedure for rapid speciation/preconcentration of trace amounts of manganese (II) and manganese (VII) ions, from water samples prior to their determination by atom trapping-flame atomic absorption spectrometry (AT-F AAS). All main factors for the quantitative recoveries of Mn(II)/Mn(VII) ions were investigated and optimized. Based on the developed method, preconcentration and speciation of Mn(II) and Mn(VII) ions with NH2-UVM-7 were obtained in water samples due to the formation of -NH-Mn2 + and -NH3+-MnO4â at optimum pH of 8 and 5, respectively. The batch adsorption capacity of NH2-UVM-7 for Mn(II) and Mn(VII) ions was found to be 1733 μmol gâ 1 and 570 μmol gâ 1, respectively. Under the optimized conditions, limits of detection (3Sb/m), and limits of quantification (10Sb/m) were 0.007 μg Lâ 1 and 0.03 μg Lâ 1 for Mn(II) as well as 0.008 μg Lâ 1 and 0.04 μg Lâ 1 for Mn(VII). The preconcentration factors for Mn(II) and Mn(VII) were calculated as 102.3 and 98.8, and their relative standard deviations were 2.3 and 2.8%, respectively (n = 10, C = 10 μg Lâ 1). The developed method was successfully applied to natural water samples. The validation of the method was also performed by the standard reference material.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Hamid Shirkhanloo, Aisan Khaligh, Hassan Zavvar Mousavi, Alimorad Rashidi,