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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Jozsef Posta

Abbrev:
Posta, J.
Other Names:
József Posta
Address:
Department of Inorganic and Analytical Chemistry, University Kossuth Lajos, PO Box 21, H-4010 Debrecen, Hungary
Phone:
NA
Fax:
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Email:

Citations 3

"Flame Atomic Absorption Spectrometric Determination Of Total Chromium And Chromium(VI) In Cigarette Ash And Smoke Using Flow Injection/hydraulic High-pressure Sample Introduction"
Microchem. J. 1998 Volume 58, Issue 3 Pages 251-255
Csilla Sógor, Attila Gáspár and József Posta

Abstract: Total chromium and Cr(VI) contents of cigarets, ash, and smoke formed while burning cigarets were determined The determinations of chromium species were carried out according to procedures developed earlier. Cr(VI) was determined in a combined system, which involves a flow injection (FI) sorption pre-concentration system, hydraulic high-pressure nebulization (HHPN) sample introduction technique, and flame atomic absorption spectrometric (FAAS) detection. The total chromium of samples in Cr(VI) form was determined in this same combined system after ashing cigarets at 800°C [after total conversion of Cr(III) of the sample to Cr(VI)]. It was found that while burning cigarets 0.8-1.2% of the original chromium content of the cigarets comes to smoke in the toxic Cr(VI) form.
Chromium(VI) Chromium, total Smoke Ash Spectrophotometry Speciation Interface Nebulizer Preconcentration

"Online Multielement Preconcentration And Inductively Coupled Plasma Atomic Emission Spectrometric Determination Of Transition Metals Using A Flow Injection Hydraulic High-pressure Nebulization-desolvation Sample Introduction System"
Microchem. J. 1998 Volume 58, Issue 3 Pages 245-250
Attila Gáspár, József Posta, Mihály Braun and Csilla Sógor

Abstract: A method was developed for simultaneous pre-concentration and online determination of 15 transition metals (Ag, Au, Cd, Cr, Cu, Fe, In, Ni, Pb, Pd, Pt, Ti, Tl, V, Zn). A polyether-ether-ketone (PEEK) loop as pre-concentration unit introduced by the authors earlier was used for the multielement flow injection (FI) pre-concentration of transition metal-pyrrolidinedithiocarbamate complexes. The pre-concentrated complexes were eluted with iso-Bu Me ketone and introduced into the inductively coupled plasma with a hydraulic high-pressure nebulizer (HHPN) and desolvation unit. The desolvation system, the use of which was necessary for aerosol of iso-Bu Me ketone eluant, was optimized. The enrichment factors of the 15 transition metals were 14-67 due to 2 min of pre-concentration time.
Metals, transition Silver Gold Cadmium Chromium Copper Iron Indium Nickel Lead Palladium Platinum Titanium Thallium Vanadium Zinc Spectrophotometry Preconcentration Polyetheretherketone Complexation MIBK Optimization Interface

"Cr(III) And Cr(VI) Online Preconcentration And Determination With High Performance Flow Flame Emission Spectrometry In Natural Samples"
Fresenius J. Anal. Chem. 1996 Volume 355, Issue 5-6 Pages 719-720
József Posta, Attila Gáspár, Róbert Tóth and László Ombódi

Abstract: Methods for the on-line chromatographic pre-concentration of Cr(III) and Cr(VI) have been developed. Cr(VI) has been pre-concentrated on an RP C18 silica based column with tetrabutylammonium-bromide (TBABr) as ion-pairing agent. Specially for Cr(III) a new and effective pre-concentration technique based on the sorption of Cr(III)-ions in a C18 column in presence of KH-phthalate has been developed. The efficiency of sample introduction into the atomic emission spectrometer could be improved by hydraulic high pressure nebulization. For the detection of chromium the acetylene/N2O flame has been used as a powerful emission spectrometric source. Applying these steps the detection limit (3) could be improved to 25 pg/mL for Cr(III) and to 20 pg/mL for Cr(VI). The method has been applied for the chromium speciation in natural water samples.
Chromium(III) Chromium(VI) Environmental Spectrophotometry Preconcentration Speciation