Prof. Dumitru N. Ristoiu Profile

Prof. Dumitru N. Ristoiu

Head of Department at Univ Babes Bolyai

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Publications (5)

Proceedings Article | 1 November 2012 Paper

Mutagenic contaminants bioaccumulation detection at ultratrace levels from complex biological matrices

Melinda Kovacs, Zaharie Moldovan, Dumitru Ristoiu

Proceedings Volume 8411, 841117 (2012) https://doi.org/10.1117/12.966599

KEYWORDS: Statistical analysis, Ions, Matrices, Spectroscopy, Biological research, Water, Soil contamination, Oceanography, Soil science, Environmental sensing

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Proceedings Article | 1 November 2012 Paper

Interplay between experimental and numerical approaches in botanical studies: development of a hybrid REC inverse method with application in mycology

Emoke Kovacs, Radu Trambitas, Arpad Imre, Melinda Kovacs, Dumitru Ristoiu

Proceedings Volume 8411, 84112N (2012) https://doi.org/10.1117/12.966608

KEYWORDS: Numerical analysis, Chemical analysis, Spectroscopy, Differential equations, Mathematics, Chromatography, Statistical analysis, Life sciences, Chemistry, Chemical engineering

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Proceedings Article | 4 December 2010 Paper

SIM-GC-MS analysis of biochemical evolution in Amanita genus

Dumitru Ristoiu, Emoke Dalma Kovacs, Codruta Cobzac, Marcel Parvu, Tania Ristoiu, Melinda Haydee Kovacs

Proceedings Volume 7821, 782120 (2010) https://doi.org/10.1117/12.882312

KEYWORDS: Spectroscopy, Biological research, Ions, Statistical analysis, Capillaries, Chemical analysis, Standards development, Electroluminescence, Helium, Environmental science

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Proceedings Article | 4 December 2010 Paper

Nanoscale determination of ecotoxicological hall-mark in animal hair

Melinda Haydee Kovacs, Dumitru Ristoiu, Tania Ristoiu

Proceedings Volume 7821, 782121 (2010) https://doi.org/10.1117/12.882351

KEYWORDS: Chemical analysis, Pollution, Industrial chemicals, Statistical analysis, Sensors, Soil contamination, Nitrogen, Environmental science, Biological research, Surveillance

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Biomonitoring studies for estimation population health surveillance and exposure risk assessment of different chemical contaminants such as chlorinated compounds or polycyclic aromatic hydrocarbon (PAH) compounds has become an important task especially after the Stockholm Convention. If before the toxicological evaluation of humans were done using invasive methods like surgery or pricking, today many scientists tried to elaborate non-invasive analytical methods without disparage the final results. During the last years studies it was observed a relative higher pollution with organochlorine and polycyclic aromatic hydrocarbon compounds in surrounding regions of Dej, Transylvania. These past studies shown that pollution with chlorinated compounds as chlorinated solvents are attributed to the industrial activities from this region. The levels in soil and river water of these compounds were: ≈ 20 - 60 μg·kg^-1 and ≈ 15 - 45 μg·L^-1, respectively. In case of PAHs the following results were obtained for soil and river water: for two ring specie was between ≈ 26 - 35 μg·kg^-1 and ≈ 21 - 30 μg·L^-1, respectively; for three ring species was 15 - 35 μg·kg^-1 and ≈ 10 - 24 μg·L^-1, respectively; and in case of four ring species was between 10 - 20 μg·kg^-1 and ≈ 3 - 15 μg·L^-1, respectively. These results carry on concern regarding the bioaccumulation of these pollutants by humans through food web chain. In order to establish the uptake level of these compounds by humans, home grown animal hair as pig and cow were analyzed through SIM-GC-MS mode and ECD-FID-GC. The presence of chlorinated solvents detected in pig and cows hair were as follows: compounds from chloromethane family ≈ 5 - 10 ng·kg^-1 dry weight; compounds from chloroethane family ≈ 7 - 34 ng·kg^-1 dry weight for pig hair, and ≈ 12 - 17 ng·kg^-1 dry weight for compounds from chloromethane family and 14 - 48 ng·kg^-1 dry weight for cow hair. Difference between accumulation levels of PAH metabolites were observed also between cow and pig hair samples.

Proceedings Article | 7 January 2009 Paper

Nanodetection of the disinfection by-products on GC-MS techniques

Dumitru Ristoiu, Melinda Haydee, Tania Ristoiu

Proceedings Volume 7297, 729729 (2009) https://doi.org/10.1117/12.823693

KEYWORDS: Chlorine, Water, Nano opto mechanical systems, Statistical analysis, Bromine, Chromatography, Sensors, Chemical species, Microorganisms, Spectroscopy

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