Vol 77, No 11 - Abstracts

JSCS Vol 77, No.11

Publication of this issue is financially co-supported by LUKOIL Srbija AD

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Whole issue - PDF 4,289 KB

J. Serb. Chem. Soc. 77 (11) 1483–1528 (2012)

UDC 546.46:66.087.3+533.9:519.6+54; JSCS–4367; doi: 10.2298/JSC120912105R; Review

REVIEW

A multidisciplinary study on magnesium

RADOMIR RANKOVIĆ, STEVAN STOJADINOVIĆ*, MIRJANA SARVAN*, BEĆKO KASALICA*, MARIJA KRMAR, JELENA RADIĆ-PERIĆ and MILJENKO PERIĆ

Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12–16, P.O. Box 47, 11158 Belgrade Serbia

*Faculty of Physics, University of Belgrade, Studentski trg 12–16, 11158 Belgrade Serbia

(Received 12 September, revised 10 October 2012)

During plasma electrolytic oxidation of a magnesium alloy (96 % Mg, 3 % Al and 1 % Zn), a luminescence spectrum in the wave number range between 19950 and 20400 cm-1 was obtained. The broad peak with a clearly pronounced structure was assigned to the v′–v″ = 0 sequence of the B1Σ+ ® X1Σ+ electronic transition of MgO. Quantum-mechanical perturbative approach was applied to extract the form of the potential energy curves for the electronic states involved in the observed spectrum, from the positions of the spectral bands. These potential curves, combined with the results of quantum-chemical calculations of the electric transition moment, were employed in subsequent variational calculations to obtain the Franck–Condon factors and transition moments for the observed vibrational transitions. Comparing the results of these calculations with the measured intensity distribution within the spectrum, the relative population of the upper electronic state vibration levels was derived. This enabled the plasma temperature to be estimated. Additionally, the temperature was determined by analysis of the recorded A2Σ+ (v′ = 0) – X2П (v″ = 0) emission spectrum of OH. The composition of the plasma containing magnesium, oxygen, and hydrogen under the assumption of a local thermal equilibrium was calculated in the temperature range up to 12000 K and for pressures of 105, 106, 107, and 108 Pa, in order to explain the appearance of the observed spectral features and to contribute to the elucidation of processes occurring during the electrolytic oxidation of Mg.

Keywords: magnesium alloy; plasma electrolytic oxidation; galvanoluminescence; B1Σ+ ® X1Σ+ electronic transition of MgO; perturbative and variational quantum-mechanical methods; ab initio quantum-chemical calculations; computation of plasma composition.

Full Article - PDF 743 KB Supplementary Material PDF 185 KB Available OnLine: 11. 10. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1529–1539 (2012)

UDC 582.476:5.4.73.05+547.513+6.095.25:615.277; JSCS–4368; doi: 10.2298/JSC120626094F Original scientific paper

Synthetic studies towards D-modified paclitaxel analogues

ZORANA FERJANČIĆ, RADOMIR MATOVIĆ* AND RADOMIR N. SAIČIĆ

Faculty of Chemistry, University of Belgrade, Studentski trg 16, P. O. Box 158, 11000 Belgrade, Serbia

*ICTM – Center for Chemistry, Njegoševa 12, 11000 Belgrade, Serbia

(Received, 26 June 2012)

A synthetic sequence has been developed for the preparation of 9,10-di-O-diacetyl-4-desmethylene-4β-(3-butenyl)-4α-hydroxy-5-O-mesyltaxicin I-1,2-carbonate 3, an intermediate in an attempted synthesis of a cyclobutane paclitaxel analogue. A series of reactions of 3 were investigated, including the protection of the sterically hindered C-4α-hydroxy group and the oxidative cleavage of the terminal double bond. Cyclization of 13 to the cyclobutane-containing intermediate failed due to the unexpected instability of the dimethylsilane protecting group under basic conditions.

Keywords: taxoids; taxanes antitumor agents; radical allylation; silyl protecting groups.

Full Article - PDF 323 KB Available OnLine: 12. 09. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1541–1549 (2012)

UDC 547.497.1+547.79:611.018.1+615; JSCS–4369; doi: 10.2298/JSC120120068S Original scientific paper

Synthesis and root growth activity of some new acetylhydrazinecarbothioAMides and 1,2,4-triazoles substituted with the 5H-dibenzo[a,d][7]annulene moiety

LAURA I. SOCEA, THEODORA V. APOSTOL, GABRIEL ŞARAMET, ŞTEFANIA F. BĂRBUCEANU, CONSTANTIN DRAGHICI* and MIHAELA DINU

Carol Davila University of Medicine and Pharmacy, Faculty of Pharmacy, Organic Chemistry Department, Traian Vuia Street 6, 020956, Bucharest, Romania
*C. D. Neniţescu Institute of Organic Chemistry, Romanian Academy, Splaiul Independenţei 202B, 060023, Bucharest, Romania

(Received 20 January, revised 20 June 2012)

New hydrazinecarbothioAMides 5a–d bearing 5H-dibenzo[a,d][7]annulene moiety were synthesized using classical procedures. 1H-NMR analysis indicated the existence of two conformational isomers, a major axial (about 75 %) and a minor equatorial one (25 %), which are interconvertible by middle ring inversion. Cyclization of compounds 5a–d in NaOH solution produced the corresponding 4H-1,2,4-triazole-3-thiols (6a–d) that proved to be pure axial isomers. All the new compounds were extensively characterized by elemental analysis, IR, UV, 1H-NMR and 13C-NMR spectroscopy and were biologically investigated using phytobiological tests.

Keywords: carbothioAMide; 1,2,4-triazole; 5H-dibenzo[a,d][7]annulene; plant growth regulation activity.

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J. Serb. Chem. Soc. 77 (11) 1551–1560 (2012)

UDC 677.027.423.1/.2:677.027.625.122; JSCS–4370; doi: 10.2298/JSC120110047P Original scientific paper

Synthesis, characterization and dyeing behaviour of heterocyclic acid dyes and mordant acid dyes on wool and silk fabrics

HITENDRA M. PATEL

Department of Chemistry, V. P. &AMp; R. P .T. P Science College, Vallabh Vidyanagar-388 120, Gujarat State, India

(Received 10 January, revised 3 May 2012)

Novel heterocyclic acid and mordant acid dyes were synthesised by the coupling of a diazonium salt solution of different aromatic AMines with 2-butyl-3-(4-hydroxybenzoyl)benzofuran. The resulting heterocyclic acid dyes were characterized by elemental analysis, IR, 1H-NMR and 13C-NMR spectral studies and UV–Vis spectroscopy. The dyeing performances of all the heterocyclic acid dyes were evaluated on wool and silk fabrics. The dyeing of chrome pre-treated wool and silk fabrics showed better hues on mordanted fabrics. The dyeing of wool and silk fabrics resulted in pinkish blue to red shades with very good depth and levelness. The dyed fabrics showed excellent to very good light, washing, perspiration, sublimation and rubbing fastness.

Keywords: heterocyclic acid dye; mordant acid dye; light fastness; washing fastness and rubbing fastness.

Full Article - PDF 206 KB Supplementary Material PDF 323 KB Available OnLine: 04. 05. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1561–1570 (2012)

UDC 546.654+547.831.7:542.913+544.478:615.28; JSCS–4371; doi: 10.2298/JSC120121039J; Original scientific paper

Lanthanum triflate-triggered synthesis of tetrahydroquinazolinone derivatives of N-allylquinolone and their biological assessment

HARDIK H. JARDOSH and MANISH P. PATEL

Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar-388120, Gujarat, India

(Received 21 January, revised 27 March 2012)

A series of 24 derivatives of tetrahydroquinazolinone has been synthesized by the one-pot cyclocondensation reaction of N-allyl quinolones, cyclic β-diketones and (thio)urea/N-phenylthiourea in the presence of lanthanum triflate catalyst. This methodology allowed the products to be achieved in excellent yield by stirring at room temperature. All the synthesized compounds were investigated against a representative panel of pathogenic strains using the broth microdilution MIC (minimum inhibitory concentration) method for their in vitro antimicrobial activity. Amongst these sets of heterocyclic compounds 5h, 6b, 6h, 5f, 5l, 5n and 6g were found to have admirable activity.

Keywords: quinolone; Biginelli reaction; one-pot synthesis; catalyst; antimicrobial activity.

Full Article - PDF 357 KB Supplementary Material PDF 190 KB Available OnLine: 24. 04. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1571–1588 (2012)

UDC 547.915+547.631.6+544.032.6–31+66.094.3–92:541.459; JSCS–4372; doi: 10.2298/JSC120012059Z; Original scientific paper

UV-induced change in the antioxidant activity of quercetin toward benzophenone-initiated lipid peroxidation

JELENA B. ZVEZDANOVIĆ, DEJAN Z. MARKOVIĆ, DRAGAN J. CVETKOVIĆ and JELENA S. STANOJEVIĆ

University of Niš, Faculty of Technology, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia

(Received 1 February, revised 19 May 2012)

The aim of this work was to estimate the degradation and change in the antioxidant activity of quercetin in the presence of two different mixtures of phospholipids in methanolic solution, under continuous UV-irradiation from three different sub-ranges (UV-A, UV-B and UV-C), in the presence and in the absence of the selected UV-absorbing photosensitizer, benzophenone. Quercetin was employed to control the lipid peroxidation process generated by UV-irradiation, by absorbing part of the UV incident light, and/or by scavenging the involved, created free radicals. The results showed that quercetin undergoes irreversible destruction, which was highly dependent on the energy input of the UV-photons, and was more expressed in the presence than in the absence of benzophenone. Simultaneously, quercetin expressed a suppression effect on lipid peroxidation processes in UV-irradiated phospholipid mixtures in both the absence and presence of benzophenone (more or less effective, respectively). In the UV-C-irradiated mixtures, photosensitizing function of benzophenone was significantly reduced due to its strong absorption in the UV-C spectral range, therefore affecting lower antioxidant activity of the remaining quercetin.

Keywords: quercetin; phospholipids; benzophenone; UV-irradiation; lipid peroxidation.

Full Article - PDF 712 KB Available OnLine: 28. 05. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1589–1597 (2012)

UDC 66.094.941+542.9+547.571+547.551:541.8:542.913:535.371; JSCS–4373; doi: 10.2298/JSC111203035L; Original scientific paper

Solvent-dependent synthesis and mono-hydrolysis of the di-Schiff base of (±)trans-1,2-cyclohexanediAMine and 2-pyridinecarboxaldehyde in Cu(II), Co(II) and Zn(II) complexes

MARYAM LASHANIZADEGAN and MARZIEH SARKHEIL

Department of Chemistry, Faculty of Sciences, Alzahra University, P. O. Box 1993893973, Tehran, Iran

(Received 3 December 2011, revised 24 March 2012)

The Schiff base ligand trans-N,N′-bis(2-pyridinylmethylene)-1,2-cyclohexanediAMine (L) was synthesized. This ligand when stirred with 1 equivalent of MCl2·xH2O (M = Cu, Co or Zn) in ethanol, undergoes partial hydrolysis of the imino bond and the resultant tridentate ligand (L′) immediately forms complexes with an N3 coordination sphere. The reactions of L with MCl2×xH2O (M = Cu, Co or Zn) in THF gave the complexes [ML]Cl2. The ligand (L) and the complexes [M(L′)Cl]Cl and [ML]Cl2 were characterized by elemental analysis, UV–Vis, FT-IR, 1H-NMR spectroscopy, GC/MS and their luminescence properties. The 1H-NMR spectra of the ligand and its diAMagnetic complexes were recorded in CDCl3 and DMSO solvents, respectively. The obtained data confirmed that the donor N atoms in the ligand coordinated to the metal ions. The luminescence studies show ligands and their complexes display intraligand (π–π*) fluorescence in MeOH solution and the solid state at room temperature.

Keywords: mono-hydrolysis; Schiff base; solvent effect; fluorescence.

Full Article - PDF 331 KB Available OnLine: 14. 04. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1599–1607 (2012)

UDC 546.73+546.811+544.478:547.217.2:546.215; JSCS–4374; doi: 10.2298/JSC120518064G Short communication

SHORT COMMUNICATION

Polyoxometalate catalysts in the oxidation of cyclooctane by hydrogen peroxide

WIMONRAT TRAKARNPRUK, APIWAT WANNATEM AND JUTATIP KONGPETH

Department of Chemistry, Faculty of Science, and Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand

(Received 24 November 2011, revised 20 April 2012)

A Keggin-type tungstocobaltate, [Co(2,2'-bipy)3]2H2[CoW12O40]× ×9.5H2O ([Co]CoW) and tetrabutylAMmonium salt of vanadium-substituted tungstophosphates [(n-C4H9)4N]4[PVW11O40], [(n-C4H9)4N]5[PV2W10O40] (PVW, PV2W) were used as catalysts for the oxidation of cyclooctane with H2O2 as the oxidant in acetonitrile. The activity of [(n-C4H9)4N4H[PCo(H2O) W11O39]×2H2O (PCoW) was also compared. The products of the reaction were cyclooctanone, cyclooctanol and cyclooctyl hydroperoxide. The experimental results showed that at an H2O2/cyclooctane molar ratio of 3 at 80 °C, [Co]CoW yielded a higher conversion and selectivity to cyclooctanone in 9 h. The V-based catalysts were more active than the Co-based tungstophosphate. PV2W gave rise to high selectivity to cyclooctyl hydroperoxide. Cyclooctane conversion was increased by increasing the reaction time or H2O2/cyclooctane molar ratio. In the presence of tungstocobaltate catalyst, 88 % cyclooctane conversion and 82 % selectivity of cyclooctanone were obtained after 12 h using an H2O2/cyclooctane molar ratio of 9. This catalyst is stable upon treatment with H2O2. Experiments with radical traps suggested the involvement of a free-radical mechanism.

Keywords: Keggin-type polyoxometalates; cyclooctane; oxidation; hydrogen peroxide; cobalt; vanadium.

Full Article - PDF 201 KB Available OnLine: 24. 04. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1609–1623 (2012)

UDC 546.57+549.753.11–36:621.793:620.193:66.022.362; JSCS–4375; doi: 10.2298/JSC120712086J Original scientific paper

Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent

ANA JANKOVIĆ, SANJA ERAKOVIĆ, ANTONIJA DINDUNE*, DJORDJE VELJOVIĆ, TATJANA STEVANOVIĆ**, DJORDJE JANAĆKOVIĆ AND VESNA MIŠKOVIĆ-STANKOVIĆ

Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia

*Institute of Inorganic Chemistry, Riga Technical University, 34 Miera Street, Salaspils, LV-2169, Latvia

**Département des sciences du bois et de la forêt, Université Laval, 2425 rue de la Terrasse, Québec, Canada

(Received 12 July, revised 27 August 2012)

Titanium is a key biomedical material due to its good biocompatibility, mechanical properties and corrosion stability, but infections at the implantation site still pose a serious threat. One approach to prevent infection is to improve the antimicrobial ability of the coating material. Silver-doped hydroxyapatite (Ag/HAP) nanoparticles were synthesized by a new modified precipitation method. The synthesized powder was used for the preparation of Ag/HAP coating on titanium by electrophoretic deposition. The coating was characterized in terms of phase composition and structure by attenuated total reflection Fourier transform infrared spectroscopy (ATR–FTIR) and X-ray diffraction (XRD); the surface morphology and chemical composition was assessed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The research focused on an evaluation of the corrosion behaviour of Ag/HAP coating in simulated body fluid (SBF) at 37 °C during prolonged immersion time by electrochemical impedance spectroscopy (EIS). The silver-doped HAP coating provided good corrosion protection in SBF solution.

Keywords: electrochemical impedance; hydroxyapatite; silver; electrophoretic deposition; simulated body fluid.

Full Article - PDF 778 KB Available OnLine: 30. 08. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1625–1640 (2012)

UDC 577.164.3+543.426.1:611.018.5+615; JSCS–4376; doi: 10.2298/JSC111005060P; Original scientific paper

Development and validation of a fluorometric method for the determination of hesperidin in human plasma and pharmaceutical forms

LEPOSAVA A. PAVUN, JASMINA M. DIMITRIĆ MARKOVIĆ*, PREDRAG T. ĐURĐEVIĆ**, MILENA D. JELIKIĆ-STANKOV***, DANIELA B. ĐIKANOVIĆ****, ANDRIJA R. ĆIRIĆ** AND DUŠAN L. MALEŠEV

Department of Physical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11000 Belgrade, Serbia

*Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12, 11000 Belgrade, Serbia

**Department of Chemistry, Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia

***Department of Analytical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11000 Belgrade, Serbia

****Institute for Multidisciplinary Researches, University of Belgrade, Despota Stefana 142, 11000 Beograd, Serbia

(Received 5 October 2011, revised 17 April 2012)

A fluorometric method, based on the fluorescence properties of the aluminium(III)–hesperidin complex, for the determination of hesperidin in human plasma and pharmaceutical forms has been developed and validated. The complex shows a strong emission in the presence of the surfactant betain sulphonate SB 12 at 476 nm with excitation at 390 nm. The linearity range for pharmaceutical forms of hesperidin was 0.06–24.4 μg mL-1 with a limit of detection, LOD, of 0.016 μg mL-1 and a limit of quantification, LOQ, of 0.049 μg mL-1. Recovery values in the range 99.3–99.7 % indicate good accuracy of the method. A linear dependence of the intensity of fluorescence of the complex on the concentration of hesperidin in plasma was obtained in concentration range from 0.1–12.2 μg mL-1. The LOD was 0.032 μg mL-1 while LOQ was 0.096 μg mL-1. Recovery values were in the range 98.4–99.8 %. The reliability of the method was checked by an LC–MS/MS method for plasma sAMples and an HPLC/UV method for tablets with direct determination of hesperidin after separation. Linearity range in determination of hesperidin in pharmaceutical forms was obtained in the range from 0.05 to 10.00 μg mL-1. The LOD was 0.01 μg mL-1 and the LOQ was 0.03 μg mL-1. The linearity range for the determination of hesperidin in plasma was 0.02–10.00 μg mL-1 with an LOD 0.005 μg mL-1 and an LOQ of 0.015 μg mL-1. The good agreement between the two methods indicates the usability of the proposed fluorometric method for the simple, precise and accurate determination of hesperidin in clinical and quality control laboratories.

Keywords: hesperidin; human plasma; tablets; fluorometry; LC–MS/MS.

Full Article - PDF 282 KB Available OnLine: 11. 06. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1641–1647 (2012)

UDC 543.632.4+546.56+543.553:628.1.033; JSCS–4377; doi: 10.2298/JSC120616090L; Note

Development of a flow injection method with AMperometric detection for the indirect determination of copper in drinking water sAMples

ALEKSANDAR LOLIĆ, TATJANA TRIPKOVIĆ, RADA BAOŠIĆ, SNEŽANA NIKOLIĆ-MANDIĆ and BOJANA STANIMIROVIĆ*

Faculty of Chemistry, University of Belgrade, P. O. Box 158, 11001 Belgrade, Serbia

*Mol a.d., Company for Chemistry, Biotechnology and Consulting, Batajnički drum 2, 11080 Belgrade, Serbia

(Received 16 June, revised 1 September 2012)

A gas-diffusion flow injection method with AMperometric detection for the indirect determination of copper on a silver electrode was developed. The flow through system was equipped with two injection valves and a gas-diffusion unit. In the first step, a signal of a cyanide solution was recorded. In the subsequent step, the signal of cyanide in the presence of copper was measured. Interferences (Cd(II), Co(II), Ag(I), Ni(II), Fe(III), Hg(II) and Zn(II)) were investigated and successfully removed. The calibration graph was linear in the range 1–90 μmol dm-3 of copper with a correlation coefficient of 0.993. The regression equation is I = (0.0455±0.0015)c + (0.4611±0.0671), where I is the relative signal decrease in μA and c is concentration in μmol dm-3. Relative standard deviation for six consecutive injections of 30 μmol dm-3 copper(II) was 1.47 % and for 1 μmol dm-3 copper(II), it was 3.40 %. The detection limit, calculated as 3 s/m (where s is a standard deviation of nine measurement of a reagent blank and m is the slope of the calibration curve), was 0.32 μmol dm-3, which corresponds to 2.44 ng of copper(II) (the loop volume was 0.12 cm3). The method enables 60 analyses per hour and it was successfully applied for the determination of copper in drinking water sAMples.

Keywords: copper determination; gas-diffusion; drinking water sAMples; copper cyano complex.

Full Article - PDF 402 KB Available OnLine: 03. 09. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1649–1659 (2012)

UDC 628.3:547.562.33+543.544.943.3.068.7; JSCS–4378; doi: 10.2298/JSC120509087N; Original scientific paper

Development and validation of a simple thin-layer chromatographic method for the analysis of p-chlorophenol in treated wastewater

MAJA NATIĆ, DRAGANA DABIĆ*, DUŠANKA MILOJKOVIĆ-OPSENICA, BILJANA DOJČINOVIĆ**, GORAN ROGLIĆ, DRAGAN MANOJLOVIĆ and ŽIVOSLAV TEŠIĆ

Faculty of Chemistry, University of Belgrade, P. O. Box 51, 11158 Belgrade, Serbia

*Innovative Centre, Faculty of Chemistry Ltd., University of Belgrade, Studentski trg 12–16, 11158 Belgrade, Serbia

**Centre of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia

(Received 9 May, revised 30 August 2012)

A thin-layer chromatographic (TLC) method with densitometric detection was established for the quantification of p-chlorophenol in wastewater. Degradation efficiency of p-chlorophenol was monitored after each treatment of the wastewater sAMples. Degradation of p-chlorophenol was performed by advanced oxidation processes (AOPs), using UV, H2O2/UV, O3/H2O2/UV, O3 and O3/UV. The developed TLC procedure was found to be simple, rapid and precise. The method is characterized by high sensitivity (the limit of detection was 11 ng per band and limit of quantification 35 ng per band), a linear range from 75 to 500 ng per band, r = 0.9965), and high precision, accuracy (mean percentage recovery 98.6 %), and specificity. Additionally, the efficiency of degradation was monitored using HPLC giving comparable results with the reversed phase TLC measurements.

Keywords: p-chlorophenol; TLC-scanner; HPLC; AOPs; wastewater treatment.

Full Article - PDF 597 KB Available OnLine: 03. 09. 2011. Cited by

J. Serb. Chem. Soc. 77 (11) 1661–1670 (2012)

UDC 628.316.12:546.47+66.067.1; JSCS–4379; doi: 10.2298/JSC120302037T; Original scientific paper

Zinc removal from wastewater by a complexation–microfiltration process

KATARINA TRIVUNAC, ZORAN SEKULIĆ* AND SLAVICA STEVANOVIĆ

University of Belgrade, Faculty of Technology and Metallurgy, Department of Analytical Chemistry and Quality Control, Karnegijeva 4, 11120 Belgrade, Serbia

*Institute of Public Health of Belgrade, Bul. Despota Stefana 54a, 11000 Belgrade, Serbia

(Received 2 March, revised 19 April 2012)

Due to its wide industrial applications, zinc has become an important contAMinant in aquatic environments since it is a toxic heavy metal and some of its compounds, such as zinc arsenate and zinc cyanide, may be extremely hazardous. Therefore, there is a growing need to develop simple methods capable of separating and recovering trace zinc from environmental waters. Nowadays, ultra- and microfiltration methods for trace metals removal from waters by the addition of a water-soluble polymer into the aqueous solutions have become a significant area of research. The choice of water-soluble macroligands remains important for the development of this technology. Sodium carboxymethyl cellulose (Na-CMC) was selected as the complexing agent. The microfiltration experiments were performed in a stirred dead-end cell. Versapor membranes were used to separate the formed polymer–metal complex. The concentration of heavy metal ions after microfiltration in aqueous solution was determined using atomic absorption spectroscopy (AAS). The effects of the AMount of complexing agent, pH value, type of anion, ionic strength and operating pressure on the flux (J) and rejection coefficient (R) were investigated. Experimental results indicate a considerable influence of the pH, ionic strength and type of anion on the rejection coefficient, while the effect of the AMount of the complexing agent was relatively insignificant. The Na-CMC used in the research proved very effective, which is supported by the high rejection coefficients obtained (99 %).

Keywords: microfiltration; complexation; heavy metal ions; wastewater treatment.

Full Article - PDF 278 KB Available OnLine: 24. 04. 2012. Cited by

J. Serb. Chem. Soc. 77 (11) 1671–1685 (2012)

UDC 550.8.04:622.276:66–965.00057; JSCS–4380; doi: 10.2298/JSC120430072M; Original scientific paper

Characterisation of weathered petroleum hydrocarbons during a landfarming bioremediation study

SNEŽANA MALETIĆ, SRĐAN RONČEVIĆ, BOŽO DALMACIJA, JASMINA AGBABA, MALCOLM WATSON, ALEKSANDRA TUBIĆ and SVETLANA UGARČINA PEROVIĆ

University of Novi Sad, Faculty of Sciences, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia

(Received 30 April, revised 3 July 2012)

Landfarming bioremediation was performed over 2 years on soil heavily polluted with weathered oil and oil derivatives: 23200 mg kg-1 of mineral oil, 35300 mg kg-1 total hydrocarbons and 8.65 mg kg-1 of total polycyclic aromatic hydrocarbons, PAHs. During the experiment, mineral oil, total hydrocarbon and PAH concentrations decreased by approximately 53, 27 and 72 %, respectively. A GC/MS scan was used to identify the crude oil components that persisted after the bioremediation treatment of the contAMinated soil and the metabolites generated during this process. The data shows that in soil contAMinated with weathered-hydrocarbons, the number of initially detected compounds after the bioremediation process further decreased over a 2-year period and, concurrently, several new compounds were observed at the end of experiment. Higher persistence was shown by heavier n-alkanes and branched alkanes, which could be detected over a longer period. The analysis highlighted the importance of n-alkanes, their substituted derivatives and PAHs as the most significant pollutants.

Keywords: weathering; bioremediation; crude oil; GC-MS fingerprint; PAH.

Full Article - PDF 626 KB Available OnLine: 11. 07. 2012. Cited by

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