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1.

001-es BibID:BIBFORM090106
035-os BibID:(cikkazonosító)104029
Első szerző:Heltai György
Cím:Application of flexible multi-elemental ICP-OES detection in fractionation of potentially toxic element content of solid environmental samples by a sequential extraction procedure / Heltai György, Győri Zoltán, Fekete Ilona, Halász Gábor, Kovács Katalin, Takács Anita, Lamlile Khumalo, Horváth Márk
Dátum:2019
ISSN:0026-265X
Megjegyzések:Remediation of areas contaminated by potentially toxic elements (PTE) requires the appropriate assessment of the environmental mobility of contaminants. The fractionation techniques developed for agrochemical and environmental purposes model the pathways of environmental mobilization mainly by sequential extraction procedures. In Europe mostly the simplified extraction scheme proposed by Community Bureau of Reference (BCR) in 1993 is widely used, why only to this certified sediment sample (BCR 701) is available, certified for fractionation of six elements (Cu, Cd, Cr, Ni, Pb, Zn). In the BCR extracts the reagent- solvents applied in leaching steps cause strong matrix interferences when for determination the PTE-contents of these solutions the multielemental capacity of inductively coupled plasma optical emission spectrometry (ICP-OES) should be utilized. Due to the different source of contamination the flexible multi-elemental ICP-OES method should be applied for analysis of the different BCR-extractant-solvent media which makes possible the reliable detection of all occurring PTE in the area. For this purpose as the most adequate solution the application of ICP-OES spectrometer with charge-coupled device (CCD)-detection was selected which is able to record the entire spectral range between 120 and 800?nm. On the basis of detailed study of BCR-solvent-matrix- and expected-analite-line interferences it was established that the sensitivities of the prominent lines of pollutant elements strongly depend on the type of extractants. For improving the accuracy of analytical results obtained for soils and environmental sediments, matrix matched calibration, internal standardization and robust plasma conditions were recommended and optimized. The successful application of this methodology is presented for a PTE-contaminated lake sediment sample and for selected typical Hungarian soil samples stored in sample bank of Hungarian Soil Protection Information and Monitoring System.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Microchemical Journal. - 149 (2019), p. 1-26. -
További szerzők:Győri Zoltán (1948-) (vegyész) Fekete Ilona Halász Gábor (biokémikus) Kovács Katalin (1978-) (agrokémia) Takács Anita Khumalo, Lamlile Horváth Márk
Pályázati támogatás:OTKA-108558
Egyéb
OTKA-118101
Egyéb
1783-3/2018/FEKUTSTRAT
Egyéb
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2.

001-es BibID:BIBFORM089689
Első szerző:Heltai György
Cím:Multi-Elemental Inductively Coupled Plasma-Optical Emission Spectroscopic Calibration Problems of the Sequential Extraction Procedure for the Fractionation of the Heavy Metal Content from Aquatic Sediments / György Heltai, Ilona Fekete, Gábor Halász, Katalin Kovács, Márk Horváth, Anita Takács, Norbert Boros, Zoltán Győri
Dátum:2015
ISSN:0133-0276
Megjegyzések:For the characterisation of the environmental mobility of heavy metal contamination in aquatic sediments, the EU Bureau of Reference has proposed a fractionation by sequential extraction procedure. For its validation, the CRM-701 sample is available containing Cd, Cr, Cu, Ni, Pb, and Zn. In this paper, the matrix-matched calibration problems are presented. A multi-elemental inductively coupled plasma-optical emission technique is employed for the detection of heavy metals in the extracts. It was established that the sensitivities are strongly influenced by the extractants, which causes significant matrix effects: the sensitivities are strongly influenced by the solvents applied in extraction steps; the summarised recoveries show an acceptable agreement with the certified values; however, in the individual extraction steps for certain elements significant differences may occur due to the neglected interferences. Therefore, further optimisation is required utilising the flexible line selection possibility offered by the HORIBA Jobin Yvon ACTIVA-M instrument.
Tárgyszavak:Természettudományok Környezettudományok magyar nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
Bio-, környezet- és vegyészmérnöki tudományok
Megjelenés:Hungarian Journal of Industrial Chemistry. - 43 : 1 (2015), p. 7-14. -
További szerzők:Kruppiné Fekete Ilona Halász Gábor (biokémikus) Kovács Katalin (1978-) (biokémikus) Horváth Márk Takács Anita Boros Norbert (1977-) (agrármérnök) Győri Zoltán (1948-) (vegyész)
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3.

001-es BibID:BIBFORM080577
035-os BibID:(MTMT)30599046
Első szerző:Heltai György
Cím:Fractionation of potentially toxic element in sediment/soil/water system by a sequential extraction procedure applying flexible multielemental spectrochemical detection in remediation of contaminated areas / György Heltai, Zoltán Győri, Ilona Fekete, Gábor Halász, Katalin Kovács, Anita Takács, Lamlile Khumalo, Márk Horváth
Dátum:2018
ISBN:978 963 9970 22 9
Tárgyszavak:Agrártudományok Élelmiszertudományok előadáskivonat
könyvrészlet
Megjelenés:XVI Hungarian - Italian Symposium on Spectrochemistry: technological innovation for water science and sustainable aquatic biodiversity / ed. Viktor Gábor Mihucz. - p. 49. -
További szerzők:Győri Zoltán (1948-) (vegyész) Fekete Ilona Halász Gábor (biokémikus) Kovács Katalin Takács Anita Khumalo, Lamlile Horváth Márk
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4.

001-es BibID:BIBFORM067413
Első szerző:Heltai György
Cím:Estimation of Environmental Mobility of Potentially Toxic Elements in the Soil/Water/Sediment System Using Spectrochemical Element Detection / György Heltai, Zoltán Győri, Ilona Fekete, Gábor Halász, Katalin Kovács, Anita Takács, Norbert Boros, Márk Horváth
Dátum:2016
ISBN:978-963-9970-65-6
Tárgyszavak:Műszaki tudományok Bio-, környezet- és vegyészmérnöki tudományok előadáskivonat
Megjelenés:European Symposium on Atomic Spectrometry: ESAS 2016 & 59th Hungarian Spectrochemical Conference : book of abstracts. / ed. Mihucz, V. G. - p. 85. -
További szerzők:Győri Zoltán (1948-) (vegyész) Fekete Ilona Halász Gábor (biokémikus) Kovács Katalin (1978-) (agrokémia) Takács Anita Boros Norbert (1977-) (agrármérnök) Horváth Márk
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM067315
Első szerző:Heltai György
Cím:Longterm study of transformation of potentially toxic element pollution in soil/water/sediment system by means of fractionation with sequential extraction procedures / Gy. Heltai, Z. Győri, I. Fekete, G. Halász, K. Kovács, A. Takács, N. Boros, M. Horváth
Dátum:2018
ISSN:0026-265X
Megjegyzések:In first part of the paper a review is given on fractionation methodologies by sequential extraction methodologies applied for risk assessment of environmental pollution by potentially toxic elements (PTE). Main sources of PTE release are the mining-, industrial-, agri-food production-, traffic- and communal-waste. In this latter the medical and health care sources may emerge due to therapeutic and diagnostic applications (Ag, As, Au, Ba, Bi, Cd, Ga, Gd, 131I, Ir, Li, Mn, Fe, Os, Pd, Pt, Rh, Ru, Sb, Sn, Ti, V), to nanomedicines, to ayurvedic herbal medicines with possible contaminant PTEs and non-controlled dietary supplements. The magnitude of adverse effects caused by PTEs in the soil-water-sediment system depends on the various chemical species that can arise. Long-term biological impacts are strongly influenced by mobilization-immobilization processes in the aquatic environment. These can be studied through sequential extraction procedures modelling their pathways. In Europe the simplified extraction scheme proposed by BCR in 1993 and modified in 2001 is mostly used for this purpose. By this approach samples are gradually decomposed and four different fractions of PTEs can be identified, i.e.: i) water-soluble and carbonate-bound fraction; ii) fraction associated with reducible Fe- and Mn-oxides; iii) organic complexed fraction and sulphides; iv) fraction soluble in oxidative acids. The sediment-based Certified Reference Material (CRM) BCR 701 was produced to check the accuracy of the fractionation procedure. The standardization process was hindered by methodological problems, i.e.: i) the solvents used in the BCR system do not mirror completely the natural mobilization processes and partly modify the original chemical species; ii) the time demand of the batch leaching extraction steps is exceedingly long (4-5 days); iii) the above CRM, certified for the fractionation of Cu, Cd, Cr, Ni, Pb and Zn, is available only for sediment and cannot be applied to other environmental matrices and other PTEs. The studies aimed at improving the BCR methodology are summarized, in particular to: i) develop continuous flow systems; ii) accelerate the BCR leaching steps by sonication; iii) extend the BCR procedure to other environmental matrices (soils, red mud, composts, biofilms) and further PTEs by multielemental (ICP-OES) detection.In second part of the paper a case study is presented for evaluation of long-term changes of the environmental mobility of PTE contaminations in the fish pond system of Gödöllő town. For vertical and horizontal mapping of PTE content of accumulated sediment layers core samples were taken in 1994, 1995 and 2013. In the sediment layers total soluble PTE content was related to the BCR fractionation. The Chernobyl origine radionuclides were detected by ?-spectroscopy. The BCR sequential extraction procedure for tracking the long-term fate of PTE contamination of different origine in surface water/sediment/systems showed a much potential. By repetition of fractionation of PTEs after 20 years clearly reflects the change of PTE concentrations in different fractions. The decrease of PTE concentrations can be explained by leaching the most mobile fractions by water exchange over the sediment and/or by remediation activity.
Tárgyszavak:Műszaki tudományok Bio-, környezet- és vegyészmérnöki tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Potentially toxic elements
Fractionation
BCR sequential extraction
ICP-OES multielemental detection of pollutants
Risk assessment
Megjelenés:Microchemical Journal. - 136 (2018), p. 85-93. -
További szerzők:Győri Zoltán (1948-) (vegyész) Fekete Ilona Halász Gábor (biokémikus) Kovács Katalin Takács Anita Horváth Márk Boros Norbert (1977-) (agrármérnök)
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6.

001-es BibID:BIBFORM079997
Első szerző:Kovács Katalin (agrokémia)
Cím:Study of ultrasound-assisted sequential extraction procedure for potentially toxic element content of soils and sediments / Katalin Kovács, Gábor Halász, Anita Takács, György Heltai, Éva Széles, Zoltán Győri, Márk Horváth
Dátum:2018
ISSN:0026-265X
Megjegyzések:For risk assessment of potentially toxic element (PTE) pollution of sediments and soils the fractionation by sequential extraction procedures are applied which require longtime leaching-shaking periods to achieve the dissolution equilibria. In this work an attempt is described for reduction the duration these leaching-shaking periods of the sequential extraction procedure proposed by Community Bureau of Reference (BCR) in 1993 by application of ultrasonic treatment. The fractionation of PTE content of BCR 701 certified reference sample was performed in three experiments: "A" experiment was the control, all extraction steps were performed with 16 hours shaking according to the BCR prescription; "B" experiment: in each extraction step was applied 1 hour preliminary ultrasonic treatment and after this 1 hour shaking; "C" experiment: only 1 hour ultrasonic treatment and no shaking was applied. It was experienced that by ultrasonic treatment can be efficiently increased the rate of dissolution when constant temperature of assisting medium was kept. 77% and 63% of element content extractable with the control "A" experiment can be extracted in "B" and "C" experiments, respectively. To achieve the 100% efficiency further experiments are in process.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Microchemical Journal. - 136 (2018), p. 80-84. -
További szerzők:Halász Gábor (biokémikus) Takács Anita Heltai György Széles Éva (1979-) (vegyész) Győri Zoltán (1948-) (vegyész) Horváth Márk
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7.

001-es BibID:BIBFORM094722
035-os BibID:(Scopus)85048933744
Első szerző:Takács Anita
Cím:Improvement of the sequential extraction procedure based on supercritical CO2 and subcritical H2O solvents for the estimation of the environmentally mobile potentially toxic element fractions of sediments and soils / Anita Takács, Katalin Kovács, Gábor Halász, Zoltán Győri, Ilona Fekete, György Heltai, Márk Horváth
Dátum:2018
ISSN:0002-1873 1588-2713
Megjegyzések:The estimation of environmental risk caused by pollution with potentially toxic elements (PTE) is usually carried out using the (3+1) step sequential extraction procedure suggested in 1993 by the Community Bureau of Reference (BCR). In the 1st step the water-soluble, exchangeable and carbonate-bound element content is extracted with acetic acid. In 2002 a fractionation procedure based on the application of supercritical CO2, subcritical H2O and of a mixture of subcritical H2O/CO2 was proposed, which allowed the water-soluble and carbonate-bound element contents to be extracted separately from sediment or soil samples weighed into the preparative column of a supercritical fluid extractor and diluted with quartz sand in a mass ratio of 1:20. The aim of the present study was to develop a new reduced-size column construction with which this dilution rate could be decreased to 1:2. A kinetic study was performed to determine the extraction time necessary for samples with different carbonate contents and the extracted element contents were compared to the results of the BCR sequential procedure on the same samples. It was established that fractionation using the reduced-size column may be a rapid way to obtain more reliable information on the easily mobilizable (water-soluble and carbonate-bound) PTE content of soils and sediments than was previously available to supplement BCR fractionation.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
Megjelenés:Agrokémia és Talajtan. - 67 : 1 (2018), p. 35-48. -
További szerzők:Kovács Katalin Halász Gábor (biokémikus) Győri Zoltán (1948-) (vegyész) Fekete Ilona Heltai György Horváth Márk
Pályázati támogatás:OTKA 108558
OTKA
Internet cím:DOI
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