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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Meissam Noroozifar

Abbrev:
Noroozifar, M.
Other Names:
Address:
Analytical Research Laboratory, Department of Chemistry, University of Sistan & Baluchestan, Zahedan, P.O. Box 98165-181, Iran
Phone:
+98 541 244 6565
Fax:
+98 541 244 6888

Citations 13

"Flow Injection Speciation Analysis Of Manganese In Real Samples By Diphenylcarbazide-spectrophotometric Determination"
Turk. J. Chem. 2003 Volume 27, Issue 2 Pages 227-233
KAZEM KARGOSHA, MEISSAM NOROOZIFAR

Abstract: The flow injection speciation of manganese in aqueous solution using a spectrophotometry method of detection is presented. Manganese (VII) can be determined spectrophotometrically at 308 nm after the reaction with Sym-diphenycarbazide in buffered at pH = 3.05 with phosphate. Under the optimized conditions, total manganese concentration can also be determined after oxidation of Mn2+ to MnO-4 and then Mn2+ concentration can be calculated from the difference. The linear range of determination is 0.047-4.50 mg/l with a 3? detection limit of 31 ?g/l. The proposed method is applied to the determination of MnO-4 and Mn2+ in effluent streams and foods with a relative standard deviation better than 1.85%. A sampling frequency of up to 24 h-1 can be achieved. Interfering ions can be removed by an ion-exchange column built into the flow injection system.

"Application Of Manganese(IV) Dioxide Microcolumn For Determination And Speciation Of Nitrite And Nitrate Using A Flow Injection Analysis-flame Atomic Absorption Spectrometry System"
Talanta 2007 Volume 71, Issue 1 Pages 359-364
Meissam Noroozifar, Mozhgan Khorasani-Motlagh, Aboozar Taheri and Marjan Homayoonfard

Abstract: A flow injection (FI) method with flame atomic absorption spectrometry (FAAS) detection was developed for the determination and speciation of nitrite and nitrate in foodstuffs and wastewaters. The method is based on the oxidation of nitrite to nitrate using a manganese(IV) dioxide oxidant microcolumn where the flow of the sample through the microcolumn reduces the MnO2 solid phase reagent to Mn(II), which is measured by FAAS. The absorbance of Mn(II) are proportional to the concentration of nitrite in the samples. The injected sample volume was 400 µL with a sampling rate of analyzes was 90 h-1 with a relative standard deviation better than 1.0% in a repeatability study. Nitrate is reduced to nitrite in proposed FI-FAAS system using a copperized cadmium microcolumn and analyzed as nitrite. The calibration curves were linear up to 20 mg L-1 and 30 mg L-1 with a detection limit of 0.07 mg L-1 and 0.14 mg L-1 for nitrite and nitrate, respectively. The results exhibit no interference from the presence of large amounts of ions. The method was successfully applied to the speciation of nitrite and nitrate in spiked natural water, wastewater and foodstuff samples. The precision and accuracy of the proposed method were comparable to those of the reference spectrophotometric method.

"Solid-phase Iodine As An Oxidant In Flow Injection Analysis: Determination Of Ascorbic Acid In Pharmaceuticals And Foods By Background Correction"
Talanta 2003 Volume 61, Issue 2 Pages 173-179
Meissam Noroozifar and Mozhgan Khorasani-Motlagh

Abstract: A flow injection analysis (FIA)-background correction method comprising two solid-phase reactors and spectrophotometry for determination of ascorbic acid (AsA) is proposed. A polyethylene mini-column filled with solid iodine (30% m/m suspended on silica gel beads), reactor 1, and other column filled only with silica gel, reactor 2, which are then incorporated in a flow system so that solid iodine reagent in reactor 1 is affected as the sample passes through the column. The sample blank is produced by the oxidation of the AsA by iodine to form dehydroascorbic acid, insensitive to ultraviolet at 267 nm. AsA in samples is determined after injected in reactor 2; the difference in two analytical signal observed is related to amount of AsA. The linear range of the system is up to 50 µg mL-1 with a detection limit of 0.08 µg mL-1, RSD of better than 1.0% and sampling frequency of 110 sample h-1. The method is successfully applied to the determination of AsA in pharmaceuticals and foods.

"The Application Of The Solid-phase Jones Reagent As A Reductant In The Speciation Flow Injection Analysis Of Fe(III) And Fe(II) In Real Samples"
Chem. Anal. 2004 Volume 49, Issue 6 Pages 929-936
M. Noroozifar, M. Khorasani-Motlagh

Abstract: A simple and low-cost flow injection (FI) system with two solid-phase reactors and spectrophotometric detection for speciation of Fe(III) and Fe(II) has been proposed. A polyethylene minicolumn was filled with Jones reductor (35% m/m suspended on silica gel beads). (Reactor 1) and another column filled only with the silica gel (Reactor 2) were incorporated into a flow system. The sample containing both Fe(III) and Fe(II)) was injected into a carrier stream (1,10-phenanthroline dissolved in buffer solution of pH 3.7). In reactor 1 Fe(III) was reduced to Fe(II) by the Jones reductor. After that the sum: Fe(III) + Fe(II) was detected spectrophotometrically at ? = 514 nm as a complex of the analyte with 1,10-phenanthroline. Fe(II) originally present in the sample was determined analogously after the injection to reactor 2. The amount of Fe(III) in the sample was estimated as the difference in the measured analytical signals. The calibration plot was linear up to the iron species concentration of 25 ?g mL-1. Detection limit (3?) was 35 ?g L -1 and the relative standard deviation < 1.7%.

"Flow-injection System For The Spectrophotometric Determination Of Mn (II) Using Sodium Bismuthate As An Oxidant And Sym-diphenylcarbazide As A Complexing Agent"
Chem. Anal. 2004 Volume 49, Issue 3 Pages 405-412
M. Noroozifar and M. Khorasani-Motlag

Abstract: Flow-injection spectrophotometric determination of manganese in aqueous solution, using a solid sodium bismuthate reactor has been presented. Manganese (Mn2+) can be determined spectrophotometrically at 308 nm after its on-line oxidation to MnO4- at the room temperature. In acidic media permanganate immediately reacts with sym-diphenylcarbazide to form a complex, the absorbance of which is measured. The linear range of the method was 5 x 10^-7-I x 10^-4 mol L-1 with a detection limit (3?) of 6 x 10^-8 mol L-1. The proposed procedure was applied to the determination of Mn2+ in effluents and food, with a relative standard deviation better than 1.85%. The sampling frequency as high as 110 h-1 could be achieved.

"Indirect Determination Of Nitrite By Flame Atomic Absorption Spectrometry Using A Lead(IV) Dioxide Oxidant Microcolumn"
Bull. Korean Chem. Soc. 2006 Volume 27, Issue 6 Pages 875-880
Meissam Noroozifar*, Mozhgan Khorasani-Motlagh, Aboozar Taheri, Marjan Homayoonfard

Abstract: A new, simple and fast flow injection analysis (FIA) method has been developed for the indirect determination of nitrite. The proposed indirect automatic method is based on the oxidation of nitrite to nitrate using a lead(IV) dioxide oxidant microcolumn where the flow of the sample through the microcolumn reduces the PbO2 solid phase reagent to Pb(II), which is measured by flame atomic absorption spectrometry. The absorbance of Pb(II) are proportional to the concentration of nitrite in the samples. The calibration curve was linear up to 30 mg L-1, with a detection limit of 0.11 mg L-1 for a 400 µL injected sample volume and a sampling rate of about 80 h-1. The results exhibit no interference from the presence of large amounts of ions. The developed procedure was found to be suitable for the determination of nitrite in foodstuffs and wastewaters. A relative standard deviation better than 0.9% was obtained in a repeatability study. The reliability of the method was established by parallel determination against the standard method.

"Simultaneous Flow-injection Speciation Of Cr(III) And Cr(VI) By Solid-phase Reactors And Spectrophotometry"
Asian J. Spectrosc. 2004 Volume 8, Issue 3-4 Pages 101-109
Kargosha, K.

Abstract: A new, simple and low-cost flow injection system with two solid-phase reactors and spectrophotometric detection for speciation of Cr(III) and Cr(VI) has been proposed. A polyethylene mini-column (60 mm and 0.7 mm i.d.) filled with 1,5-diphenylcarbazide (25% m/m suspended on silica gel beads) in below, 1,5-diphenylcarbazone (25% m/m suspended on silica gel beads) in middle and Jones-reductor in up (reactor I), and another column filled only with 1,5-diphenylcarbazide (reactor II) were incorporated into a flow system. In reactor I, Cr(III) in samples (containing both Cr(III) and Cr(VI)) injected into 0.5 M H2SO4 as a carrier stream was reduced to Cr(II) by Jones-reductor, which was determined spectrophotometry at 548 nm by complexation with 1,5-diphenylcarbazone. Also, Cr(VI) was determined after complexation with 1,5-diphenylcarbazide in reactors I and II in the same wavelength. The amount of Cr(III) in the sample was estimated as the difference in the two determination from reactor I and reactor II. The calibration plots were up to 30 ?g mL-1 and 35 ?g mL-1 for Cr(III) and Cr(VI), respectively. Detection limits (3?) were 70 ?g L-1 for Cr(III) and 30 ?g L-1 for Cr(VI) with a relative standard deviation <1.7%. The proposed system is suitable for determination of Cr(III), Cr(VI) and total chromium in spiked and effluent streams samples.

"Indirect Spectrophotometric Determination Of Ascorbic Acid By Dissolution Of Diphenylcarbazide And Chromate In A Flow Injection System"
Asian J. Spectrosc. 2003 Volume 7, Issue 1 Pages 19-25
Noroozifar, M; Khorasani-Motlagh, M; Estakhri, M;

Abstract: A new rapid and sensitive flow injection analysis method for determination of ascorbic acid in pure form and in a number of their pharmaceutical preparations and real samples is proposed. The method is based on the oxidation of ascorbic acid by a known excess amount of potassium chromate followed by the estimation of unreacted amount of chromate by reacting with dissolution sym-diphenylcarbazide. Solid sym-diphenylcarbazide (35% m/m suspended on silica gel beads) is packed in a steeliness column, which is then incorporated in a single-line flow system so that reagent dissolution is affected as the remaining chromate ions passes through the column. The reacted oxidant corresponds to the ascorbic content. At the maximum absorption of 548 nm, the calibration curve was linear up to 12 ?g mL-1 of ascorbic acid with a detection limit of 0.05 ?g/ml, RSD of better than 1.65% and sampling frequency of 90 h-1. Excipients used as additives in pharmaceutical formulations did not interfere in the proposed procedure. The reliability of the method was established by parallel determination against the 2,6-dichorophenolindophenol methods. The procedure described was successfully applied to the determination of the bulk drugs, in pharmaceutical formulations and real samples.
Ascorbic acid Pharmaceutical Spectrophotometry

"Mn(III)-diphenylcarbazone Immobilized On Silica Gel As An Oxidant For Speciation Of Chromium(III) And Chromium(VI) In A Flow Injection System"
Asian J. Spectrosc. 2002 Volume 6, Issue 3 Pages 97-109
Noroozifar, M.

Abstract: A flow injection analysis method comprising two solid-phase reactors and spectrophotometry for speciation of Cr(III) and Cr(VI) is reported. A polyethylene mini-column half filled with 1,5-diphenylcarbazide (suspended on silica gel beads) and half filled with Mn(III)-1,5-diphenylcarbazone (immobilized on silica gel beads), reactor 1, and another column filled only with 1,5-diphenylcarbazide (suspended on silica gel beads), reactor 2, which are then incorporated in a flow system so that Mn(III)-1,5-diphenylcarbazone and 1,5-diphenylcarbazide reagents in reactors are affected as the sample passes through the columns. In reactor 1, Cr(III) in samples (containing both Cr(III) and Cr(VI)) injected into 0.5 M H2SO4 as a carrier stream was oxidized by Mn(III)-1,5-diphenylcarbazone to form Cr(VI), then total Cr(VI) was detected by spectrophotometry at 548 nm by complexation with 1,5-diphenycarbazide. Chromium (VI) in samples is determined after injection through reactor 2; the difference in the two analytical signals observed is related to amount of chromium(III). The calibration curve was linear up to 3.0 ?g mL-1 of chromium species with a 3? detection limit of 0.09 ?g L-1 and a relative standard deviation <1.34%. The method is free from most interferences. The proposed system is suitable for determination of Cr(III) and Cr(VI) and total chromium in spiked and effluent streams samples.

"Pneumatic Flow Injection Analysis-Tandem Spectrometer System For Iron Speciation"
Anal. Sci. 2006 Volume 22, Issue 1 Pages 141-144
Meissam Noroozifar, Mozhgan Khorasani-motlagh And Reza Akbari

Abstract: A pneumatic flow injection-tandem spectrometer system, without a delivery pump was used for the speciation of iron. In this system, the suction force of a pneumatic nebulizer of a flame absorption spectrometer was used for solution delivery through the manifold. The Fe(III) and total Fe concentrations were determined using thiocyanate ion in a UV-Vis spectrometer and a FAAS, respectively. The Fe(II) was determined by the difference. The calibration curves were linear up to 18 µg mL-1 and 25 µg mL-1 with detection limits of 0.09 µg mL-1 and 0.07 µg mL-1 for Fe(III) and Fe(II), respectively. The mid-range precision and accuracy were <2.5% and ±3% for the two species, respectively, at a sampling rate of 120 h-1. This system was applied for the determination of Fe(III) and Fe(II) in industrial water, natural water and spiked samples.

"Atomic Absorption Spectrometry For The Automatic Indirect Determination Of Ascorbic Acid Based On The Reduction Of Manganese Dioxide"
Anal. Sci. 2005 Volume 21, Issue 6 Pages 655-659
Meissam Noroozifar, Mozhgan Khorasani-motlagh And Kambiz Akhavan

Abstract: A new and simple flow injection method followed by atomic absorption spectrometry has been developed for the indirect determination of ascorbic acid. The proposed method is based on oxidation of ascorbic acid to dehydroascorbic acid using a solid-phase manganese dioxide (30% m/m suspended on silica gel beads) reactor. The flow of the sample through the column reduces the MnO2 to Mn(II) in an acidic carrier stream of 6.3 mM HNO3 (pH 2.2) with flow rate of 4.0 ml/min at room temperature; Mn(II) is measured by atomic absorption spectrometry. The absorbance of Mn(II) is proportional to the concentration of ascorbic acid in the sample. The calibration curve was linear up to 30 mg/L, with a detection limit of 0.2 mg/L for a 220 µL injected sample volume. The developed procedure was found to be suitable for the determination of AsA in pharmaceuticals and foods with a relative standard deviation better than 1.09% and a sampling rate of about 95 h-1. The results exhibit no interference from the presence of large amounts of organic compounds. The reliability of the method was established by parallel determination against the 2,6-dichlorophenol-indophenol methods.

"Flow Injection Analysis-flame Atomic Absorption Spectrometry System For Indirect Determination Of Cyanide Using Cadmium Carbonate As A New Solid-phase Reactor"
Anal. Chim. Acta 2005 Volume 528, Issue 2 Pages 269-273
M. Noroozifar, M. Khorasani-Motlagh and S.-N. Hosseini

Abstract: A new and simple flow injection system procedure has been developed for the indirect determination of cyanide. The method is based on insertion of aqueous cyanide solutions into an on-line cadmium carbonate packed column (25% m/m suspended on silica gel beads) and a sodium hydroxide with pH 10 is used as the carrier stream. The eluent containing the analyte as cadmiumcyanide complexes, produced from reaction between cadmium carbonate and cyanide, measured by flame atomic absorption spectrometry. The absorbance is proportional to the concentration of cyanide in the sample. The linear range of the system is up to 15 mg L-1 with a detection limit 0.2 mg L-1 and sampling rate 72 h-1. The method is suitable for determination of cyanide in industrial waste waters with a relative standard deviation better than 1.22%. © 2004 Elsevier B.V. All rights reserved.

"Automatic Spectrophotometric Procedure For Determination Of L-ascorbic Acid Based On Reduction Of Iron(III)-thiocyanate Complex"
Acta Chim. Slov. 2004 Volume 51, Issue 4 Pages 717-727
Meissam Noroozifar,* Mozhgan Khorasani-Motlagh, and Abdol-Rahim Farahmanda

Abstract: A very simple spectrophotometric method has been developed for indirect determination of L-ascorbic acid using flow injection system based on the redox reaction between iron(III)-thiocyanate complex and L-ascorbic acid in acidic medium. A negative peak results from an injection of L-ascorbic acid into an iron(III)-thiocyanate complex camer stream when absorbance is monitored at 462 nm. The height of the negative peak is proportional to the concentration of L-ascorbic acid in the sample. Figures of merit such as a relative standard deviation of 2.0% (n=6), linearity range up to 100 ?g/mL and detection limit of 0.36 ?g/mL were obtained. No significant differences at the 95% confidence level were observed in comparison with results obtained by a manual procedure. The proposed system allowed the determination of L-ascorbic acid in pharmaceutical formulations and foods.