TY - JOUR AU - D'Ulivo, A. AU - Mester, Zoltán AU - Meija, J. AU - Sturgeon, R.E. TI - Gas chromatography-mass spectrometry study of hydrogen-deuterium exchange reactions of volatile hydrides of As, Sb, Bi, Ge and Sn in aqueous media JF - SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY J2 - SPECTROCHIM ACTA B VL - 61 PY - 2006 IS - 7 SP - 778 EP - 787 PG - 10 SN - 0584-8547 DO - 10.1016/j.sab.2006.06.004 UR - https://m2.mtmt.hu/api/publication/30393720 ID - 30393720 AB - The H-D exchange processes in MHn or MDn hydrides (M = As, Sb, Bi, n = 3; M = Ge, Sn, n = 4) taking place when they are in contact with H2O or D2O solution at different pH or pD values (interval of pH = [0,13]) have been investigated using gas chromatography-mass spectrometry (GC-MS). MHn or MDn compounds were injected into the headspace of reaction vials (4-12 ml) containing 1-2 ml of buffered solution maintained under stirring or shaking conditions. The isotopic composition of the gaseous phase hydrides/deuterides was determined at regular intervals in the range of time 0-15 min. The MHn or MDn compounds were synthesized in separate vials and their purity was checked separately before injection into the reaction vials. The mass spectra were deconvoluted in order to estimate the relative abundance of each species formed following the H-D exchange process (AsHnD3-n, SbHnD3-n, BiHnD3-n, n = 0-3; GeHnD4-n, SnHnD4-n, n = 0-4) and the relative abundance of H and D. In the investigated pH (or pD) interval arsanes and stibanes undergo H-D exchange in alkaline media for pH > 7. No H-D exchange was detected for the other hydrides, where the prevailing process is their decomposition in the aqueous phase. A reaction model, based on the formation of protonated or deprotonated intermediates is proposed for H-D exchange of MHn or MDn compounds placed in contact with H2O or D2O at different pH or pD values. The H-D exchange in the already formed hydrides can be source of the interference in mechanistic studies on hydride formation performed using labeled reagents; no H-D exchange was detected within the following pH intervals that can be considered free from interference: arsanes pH = [0,7), stibanes pH = [0,7), bismuthanes, germanes and stannanes pH = [0,13]. © 2006 Elsevier B.V. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Galbács, Gábor TI - A review of applications and experimental improvements related to diode laser atomic spectroscopy JF - APPLIED SPECTROSCOPY REVIEWS J2 - APPL SPECTROSC REV VL - 41 PY - 2006 IS - 3 SP - 259 EP - 303 PG - 45 SN - 0570-4928 DO - 10.1080/05704920600620378 UR - https://m2.mtmt.hu/api/publication/1983806 ID - 1983806 LA - English DB - MTMT ER - TY - JOUR AU - Karosi, R AU - Andruch, V AU - Posta, József AU - Balogh, József TI - Separation of chromium (VI) using complexation and its determination with GFAAS JF - MICROCHEMICAL JOURNAL J2 - MICROCHEM J VL - 82 PY - 2006 IS - 1 SP - 61 EP - 65 PG - 5 SN - 0026-265X DO - 10.1016/j.microc.2005.07.005 UR - https://m2.mtmt.hu/api/publication/1420729 ID - 1420729 N1 - Cited By :34 Export Date: 23 May 2023 CODEN: MICJA Correspondence Address: Posta, J.P.O. Box 21, H-4010 Debrecen, Hungary; email: postaj@tigris.unideb.hu AB - In acidic medium and in the presence of chloride ions 2-[2-(4-methoxy-phenylamino)-vinyl]-1,3,3-trimethyl-3H-indolium chloride forms complex with Cr(VI). The optimum conditions (pH, concentration of Cl- and the complex forming reagent) of the separation and extraction of Cr(VI) into toluene using this basic dye as a complexing reagent have been determined and the possible interferences of Ca, Mg, Na, K, Cr(III), Ni, Pb, Hg, Mn, Al, Cu have been studied. An electrothermal atomic absorption spectrometer (GFAAS) was used for the determination of Cr(VI). The detection limit of the method for Cr(VI) found to be 0.15 mu g dm(-3) and RSD for spiked drinking water was better than 3%. (c) 2005 Published by Elsevier B.V. LA - English DB - MTMT ER - TY - JOUR AU - Mester, Zoltán AU - Willie, S AU - Yang, Lu AU - Sturgeon, R AU - Caruso, J AU - Fernandez, M AU - Fodor, Péter AU - Goldschmidt, R AU - Goenaga-Infante, H AU - Lobinski, R AU - Maxwell, P AU - McSeehy, S AU - Polatajko, A AU - Sadi, B AU - Sanz-Medel, A AU - Scriver, C AU - Szpunar, J AU - Wahlen, R AU - Wolf, W TI - Certification of a new selenized yeast reference material (SELM-1) for methionine, Selenomethionine and total selenium content and its use in an intercomparison exercise for quantifying these analytes JF - ANALYTICAL AND BIOANALYTICAL CHEMISTRY J2 - ANAL BIOANAL CHEM VL - 385 PY - 2006 IS - 1 SP - 168 EP - 180 PG - 13 SN - 1618-2642 DO - 10.1007/s00216-006-0338-0 UR - https://m2.mtmt.hu/api/publication/1721087 ID - 1721087 N1 - Megjegyzés-21280068 Megjegyzés-21785811 Chemicals/CAS: methionine, 59-51-8, 63-68-3, 7005-18-7; selenium, 7782-49-2; selenomethionine, 1464-42-2, 3211-76-5; Methionine, 63-68-3; Selenium, 7782-49-2; Selenomethionine, 1464-42-2 LA - English DB - MTMT ER - TY - JOUR AU - Samek, O AU - Lambert, J AU - Hergenroder, R AU - Liska, M AU - Kaiser, J AU - Novotny, K AU - Kuhlevszkij, Szergej TI - Femtosecond laser spectrochemical analysis of plant samples JF - LASER PHYSICS LETTERS J2 - LASER PHYS LETT VL - 3 PY - 2006 IS - 1 SP - 21 EP - 25 PG - 5 SN - 1612-2011 DO - 10.1002/lapl.200510051 UR - https://m2.mtmt.hu/api/publication/1698925 ID - 1698925 N1 - Z9: 25 WC: Instruments & Instrumentation AB - Using a femtosecond laser-based technique, spectro-chemical analysis of leaf samples is demonstrated. The study is exemplified for Fe. Standard reference concentrations - internal standards - of Fe in the two leaf samples were measured using the method of Relaxation Weighted Magnetic Resonance Imaging. From the spectra obtained using Laser Induced Breakdown Spectroscopy technique, spatial distribution of Fe within the leaf was identified. Thus, this technique could potentially be used as a complementary technique for identification of storage and trafficking of iron ions within different plant compartments. In particular, individual plant cells can be investigated without collateral damage with high spatial distribution. LA - English DB - MTMT ER - TY - JOUR AU - Sturgeon, R.E. AU - Willie, S.N. AU - Mester, Zoltán TI - UV/spray chamber for generation of volatile photo-induced products having enhanced sample introduction efficiency JF - JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY J2 - J ANAL ATOM SPECTROM VL - 21 PY - 2006 IS - 3 SP - 263 EP - 265 PG - 3 SN - 0267-9477 DO - 10.1039/b517884c UR - https://m2.mtmt.hu/api/publication/30393722 ID - 30393722 N1 - Cited By :53 Export Date: 15 January 2019 CODEN: JASPE Correspondence Address: Sturgeon, R.E.; National Research Council Canada, Institute for National Measurement Standards, Ottawa, Canada; email: Ralph.sturgeon@nrc.ca AB - A combined spray chamber/UV photolysis unit is described which is shown to substantially enhance sample introduction efficiency for several elements in the presence of 1-5% concentrations of formic, acetic and propionic acids. Enhancement factors of 2-40-fold were achieved for Ag, As, Se, Sb, Hg, I, Bi, Pb and Sn when the aerosol field within the cyclonic chamber produced during conventional concentric nebulizer sample introduction was illuminated by an axially placed 6 W mercury pen lamp. UV photolysis of the organic acids likely initiates radical reactions, generating volatile analyte species. © the Royal Society of Chemistry 2006. LA - English DB - MTMT ER - TY - JOUR AU - Abrankó, László AU - Jókainé Szatura, Zsuzsa AU - Fodor, Péter TI - Investigation of the species-specific degradation behaviour of methylmercury and ethylmercury under microwave irradiation JF - ANALYTICAL AND BIOANALYTICAL CHEMISTRY J2 - ANAL BIOANAL CHEM VL - 383 PY - 2005 IS - 3 SP - 448 EP - 453 PG - 6 SN - 1618-2642 DO - 10.1007/s00216-005-3395-x UR - https://m2.mtmt.hu/api/publication/1390068 ID - 1390068 AB - The degradation behaviour of methylmercury (MeHg) under microwave irradiation is investigated, as is the (different) degradation behaviour of ethylmercury (EtHg) under similar irradiation. A simple and highly sensitive SPME-GC-pyrolysis-AFS system was used to analyse the aqueous MeHg and EtHg standard solutions after derivatization with sodium tetraphenylborate (NaBPh4). Samples were irradiated in a microwave digester at microwave powers ranging from 20 to 160 W for durations of 2 to 10 min. The different tolerances towards microwave treatment of the two organomercury species were evident. Practically no degradation was experienced for MeHg for up to 8 minutes of irradiation at 120 W or for up to 4 minutes at 160 W. Significant analyte loss was observed for EtHg after 2 minutes at 40 W of microwave power. LA - English DB - MTMT ER - TY - JOUR AU - Mester, Zoltán AU - Sturgeon, R TI - Trace element speciation using solid phase microextraction JF - SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY J2 - SPECTROCHIM ACTA B VL - 60 PY - 2005 IS - 9-10 SP - 1243 EP - 1269 PG - 27 SN - 0584-8547 DO - 10.1016/j.sab.2005.06.013 UR - https://m2.mtmt.hu/api/publication/21092599 ID - 21092599 LA - English DB - MTMT ER -