University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Mojtaba Shamsipur

Abbrev:
Shamsipur, M.
Other Names:
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Department of Chemistry, Razi University, Kermanshah, Iran
Phone:
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Citations 5

"A Rapid Method For The Extraction And Separation Of Uranium From Thorium And Other Accompanying Elements Using Octadecyl Silica Membrane Disks Modified By Tri-n-octyl Phosphine Oxide"
Sep. Sci. Technol. 2000 Volume 35, Issue 7 Pages 1011-1019
MOJTABA SHAMSIPUR, YADOLLAH YAMINI, PARVIZ ASHTARI, ALI REZA KHANCHI, MOHAMMAD GHANNADI-MARAGEH

Abstract: A simple method for rapid and selective separation of uranyl ion from Th4+ and other accompanying elements by using octadecyl silica membrane disks modified with tri-n-octyl phosphine oxide (TOPO) in the presence of 0.5 M HNO3 is presented. The influences of type and concentration of acid, nature of ligands, flow rates, and nature of stripping agents have been investigated. Maximum capacity of the membrane disks modified by 50 mg TOPO was found to be 938 µg of uranium. The method was applied to the recovery of uranyl ion from two different soil samples.
Preconcentration

"Preconcentration Of Ultra Trace Hg(II) In Aqueous Samples On Octadecyl Silica Membrane Disks Modified By Dibenzodiazathia-18-crown-6-dione And Its Determination By Cold Vapor Atomic Absorption Spectrometry"
Int. J. Environ. Anal. Chem. 2002 Volume 82, Issue 1 Pages 23-30
Mojtaba Shamsipur, Alireza Ghiasv, Hashem Sharghi

Abstract: A simple and reliable method has been developed to selectively separate and concentrate ultra trace amounts of mercury ion from aqueous samples for the subsequent measurement by cold vapor atomic absorption spectrometry (CVAAS). The Hg2+ ions are adsorbed selectively and quantitatively during passage of aqueous samples through octadecyl-bonded silica membrane disks modified by dibenzodiazathia-18-crown-6-dione. The retained mercury ions are then stripped from the disk with a minimal amount of 0.5 M hydrobromic acid solution as eluent, and determined by CVAAS. The proposed method permitted large enrichment factors of about 300 or higher. The limit of detection of the proposed method is 3 ng Hg2+ per 1000 mL. The method was applied to the recovery determination in four water samples.

"Preconcentration Of Trace Amounts Of Silver Ion In Aqueous Samples On Octadecyl Silica Membrane Disks Modified With Hexathia-18-crown-6 And Its Determination By Atomic Absorption Spectrometry"
Fresenius J. Anal. Chem. 2000 Volume 367, Issue 3 Pages 246-249
M. Shamsipur, M. H. Mashhadizadeh

Abstract: A simple and reliable method has been developed to selectively separate and concentrate trace amounts of silver ion from aqueous samples for the subsequent measurement by atomic absorption spectrometry. Ag+ ions are absorbed quantitatively during passage of aqueous samples through an octadecyl-bonded silica membrane disk modified by hexathia-18-crown-6. Almost all matrix elements will pass through the disk to drain. The retained Al ions are then stripped from the disk with a minimal amount of thiosulfate solution as eluent. The proposed method permitted large enrichment factors of about 200 and higher. The limit of detection of the proposed method is 50 ng Ag+ pel 1000 mL. The effects of various cationic interferences on the recovery of silver in binary mixtures were studied. The method was applied to the recovery of Ag+ ions from different synthetic and water samples.

"Separation And Preconcentration Of Trace Amounts Of Lead On Octadecyl Silica Membrane Disks Modified With A New O,S-containing Schiffs Base And Its Determination By Flame Atomic Absorption Spectrometry"
Anal. Sci. 2000 Volume 16, Issue 11 Pages 1221-1223
Omid Reza HASHEMI), Farhad RAOUFI), Mohammad Reza GANJALI), Abolghasem MOGHIMI), Maryam KARGAR-RAZI), Hossein AGHABOZORG) and Mojtaba SHAMSIPUR

Abstract: We have recently modified the octadecyl silica membrane disks with some macrocyclic and classical ligands for the selective extraction and determination of ultra-trace amounts of mercury, barium, lead and uranium. In this paper, we report on a rapid and efficient method for the selective extraction and concentration of ultra-trace amounts of Pb2+ ions by octadecyl silica disks modified with a recently synthesized O,S-containing Schiff's base derived from thiophene-2- carabaldehyde (ethaneamine 2,2'-[1,2-ethylenebis(oxy)]N,N'- bis(2-thienylmethylene), L) from aqueous media and its determination by flame atomic absorption spectrometry (FAAS).

"Solid Phase Extraction And Determination Of Ultra Trace Amounts Of Mercury(II) Using Octadecyl Silica Membrane Disks Modified By Hexathia-18-crown-6-tetraone And Cold Vapor Atomic Absorption Spectrometry"
Anal. Chim. Acta 1997 Volume 355, Issue 1 Pages 69-74
Yadollah Yamini, Naader Alizadeh and Mojtaba Shamsipur*

Abstract: A simple method for rapid extraction and determination of ultra trace amounts of mercury(II) ions using octadecyl-bonded silica membrane disks modified with hexathia-18-crown-6-tetraone and cold vapor atomic absorption spectrometry (CVAAS) is presented. Extraction efficiency and the influence of flow rates, pH, and type and smallest amount of stripping acid were evaluated. Maximum capacity of the membrane disks modified by 10 mg of the crown ether was found to be 241 µg Hg2+ ions. The limit of detection of the proposed method is 6 ng per 1000 mL. The method was applied to the recovery of Hg2+ ions from synthetic samples and four different water samples.
Mercury(II) Spectrophotometry Sample preparation PPT C18 Crown ether Solid phase extraction