Browsing by Author "Ciornea, Victor"

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CALITATEA PRODUSELOR PISCICOLE ÎN RELAȚIE CU METALELE DIN MEDIUL ACVATIC ȘI PROCESELE DE ACUMULARE
(CEP USM, 2024) Zubcov, Natalia; Zubcov, Elena; Ene, Antoaneta; Bagrin, Nina; Ciornea, Victor
Currently, the polyfunctional role of microelements in the metabolic processes of ichthyofauna (respiration, hematopoiesis, digestion, multiplication, increase or decrease of growth intensity resistance) is unanimously recognized, being also an indicator of the quality of fish products. The experimental investigations allowed the elaboration and implementation of the use of microelements-metals to increase the viability of fish in early ontogenesis, to increase the nutritional base in ponds, confirmed and protected by patents and which has essentially improved the technology of artificial fish breeding and served as an essential support in the development of fish farming. By using ICP-OES techniques for metals quantification, and tested regarding the impact of some metals and metalloids on the development of fish, their potential for the accumulation of metals, the concentrations of which are limited for fish products. It is also worth mentioning the redistribution of metals between different organs of fish in dependence on the intensity of growth and reproduction processes and fish health state. The highest concentrations of metals are recorded in the skin, liver and gills of fish.
HETEROMETALLIC COMPOUNDS WITH THE BINUCLEAR COMPLEX ANION [CR2 (OH)(AC)(NTA)2 ]2– : SYNTHESIS AND STRUCTURE
(2009) Ciornea, Victor; Șova, Sergiu; Novițchi, Ghenadie; Ganju, Dumitru; Cajeva, Olga; Gulea, Aurelian; Simonov, Iurie
Heterometallic compounds BaCr2(OH)(Ac)(Nta)2 • 4H2O (I) and [Fe(L)3][Cr2(OH)(Ac)(Nta) 2] • nH2O (L is Bipy (II) and Phen (III); Bipy is, αα′-bipyridine, Phen is o,o′-phenanthroline, Ac - is acetate ion, Nta is nitrilotriacetate ion; n = 8 (II) and 6.25 (III)) are synthesized. According to the X-ray diffraction data, compounds II and III have ionic structures built of the isolated complex cations [Fe(L) 3]2+, binuclear complex anions [Cr2(OH)(Ac) (Nta)2]2-, and crystallization water molecules. The magnetic properties of compounds II and III in the interval from 2 to 300 K confirm assumptions on the diamagnetic character of [Fe(L)3] 2+ and indicate the antiferromagnetic interaction between the chromium atoms in the dimeric fragment [Cr2(OH)(Ac)(Nta) 2]2-.
STUDIUL METALELOR ÎN ECOSISTEMELE ACVATICE ALE FLUVIULUI NISTRU: ABORDĂRI, EVALUĂRI, ELABORĂRI
(Editura USM, 2023) Zubcov, Elena; Zubcov, Natalia; Bagrin, Nina; Bileţchi, Lucia; Ciornea, Victor; Jurminskaia, Olga; Ciorba, Petru
Sunt prezentate unele rezultate privind migrația metalelor-microelemente în ecosistemele fl. Nistru în condițiile schimbărilor climaterice și activității umane, în special, ale hidroenergeticii, și legitățile stabilite de migraţie a metalelor în sistemul „apă – suspensii – depuneri subacvatice” și de bioconcentrare care reprezintă unul din obiectivele fundamentale în descifrarea proceselor de funcționare a ecosistemelor acvatice.
SYNTHESIS AND PHYSICO-CHEMICAL STUDIES OF HETEROMETALLIC NITRILOTRIACETATES OF CHROMIUM(III) WITH SOME 3d METALS
(Academia de Știinițe a Moldovei, 2006) Ciornea, Victor; Gulea, Aurelian
Heterometallic complexes of chromium (III) with some 3d metals have been synthesized based on nitrilotriacetic acid (H3nta), like M(bpy)2Cr2(OH)2(nta)2·nH2O, where M = Mn2+, Co2+, Ni2+ and Zn2+; bp = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from the results of the elemental analysis and thermogravimetric study. The coordination modes of the nta3 ̄ ligand and the type of chemical bonds have been proposed basing on IR spectra.
SYNTHESIS AND PHYSICO-CHEMICAL STUDIES OF HETEROMETALLIC NITRILOTRIACETATES OF CHROMIUM(III) WITH SOME 3D METALS
(Institute of Chemistry of ASM, 2006) Gulea, Aurelian; Ciornea, Victor
Heterometallic complexes of chromium (III) with some 3dmetals have been synthesized based onnitrilotriacetic acid (H3nta), like M(bpy)2Cr2(OH)2(nta)2·nH2O, where M = Mn2+, Co2+, Ni2+ and Zn2+; bpy = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from theresults of the elemental analysis and thermogravimetric study. The coordination modes of the nta3 ̄ ligand and the type of chemical bonds have been proposed basing on IR spectra.
SYNTHESIS AND PHYSICO-CHEMICAL STUDIES OF HETEROMETALLIC NITRILOTRIACETATES OF CHROMIUM(III) WITH SOME 3D METALS
(2006) Ciornea, Victor; Gulea, Aurelian
Heterometallic complexes of chromium (III) with some 3d metals have been synthesized based on nitrilotriacetic acid (H3 nta), like M(bpy)2 Cr2 (OH)2 (nta)2·nH2O, where M = Mn 2 , Co2 , Ni 2 and Zn2 ; bpy = α,α′-bipyridine; n = 8 or 9. Their chemical composition has been determined from the results of the elemental analysis and thermogravimetric study. The coordination modes of the nta3¯ ligand and the type of chemical bonds have been proposed basing on IR spectra.
SYNTHESIS AND STRUCTURE OF HETEROMETALLIC CHROMIUM(III) COMPLEXES WITH ETHYLENEDIAMINETETRAACETIC ACID
(2005) Ciornea, Victor; Filippova, Irina; Gulea, Aurelian; Șova, Sergiu; Borta, A.; Simonov, Iurie
The complexes [M(Tsc)2][Cr(Edta)]2, where M is Ni, Cu; Tsc is thiosemicarbazide; Edta4- is the ethylenediaminetetraacetate anion, were synthesized and characterized by X-ray diffraction. The ionic structures are composed of the [M(Tsc)2] 2+ cations and [Cr(Edta)]- anions with a component ratio of 1 : 2. The cation has a distorted trans-square coordination. The carboxyl groups of the H4Edta molecule are deprotonated and the ligand is attached to the Cr atom in the hexadentate chelating mode. The cations and anions are linked by a system of hydrogen bonds.