APPLICATION OF MEMBRANE TECHNOLOGY IN THE TREATMENT AND ANALYSIS OF TRIAZINE PESTICIDES IN WATER

The quality of consumable water is decreasing due to increasing water pollution caused by the production and use of human-made chemicals. A significant part of these chemicals are pesticides from the class of triazines since they are widely used in agriculture as herbicides. Water treatment techniques mainly rely on separation science, where the membrane technology has been identified as the most useful. Membrane processes used in water treatment are microfiltration, ultrafiltration, nanofiltration and reverse osmosis. In general, the pollutant retention/rejection by membranes depends on the physicochemical properties of the membrane i.e. membrane material, porosity, pore size and on the properties of the pollutant molecule i.e. size, length, width, molecular weight, hydrophobicity or dipole moment. The pollutant retention also depends on the feed-water composition (organic matter and salt presence, solute concentration, water pH). Thus, effective water treatment depends on the selection of an appropriate type of membrane for a particular type of pollutants. Membrane technology is also significant because it is used in polluted water analysis, more precise as a part of a liquid-phase or solid-phase microextraction. Among several developed membrane-based microextraction methods, in triazine polluted water analysis common are membrane-protected solid-phase microextraction and hollow-fiber liquid-phase microextraction. In this field, researchers tend to achieve membrane-pollutant compatibility through the synthesis of polymeric materials with molecular recognition properties i.e. through a technology called molecular imprinting. HIGHLIGHTSAmong several water treatment techniques, the membrane technology has been identified as the most robust and flexible one.The most common water pollutants are triazine pesticides since they are widely used in agriculture as herbicides.The triazines retention by membranes depends on the membrane and triazine molecule properties, but also on the feed-water composition.Thanks to the molecular imprinting technology, membrane technology has found its application in polluted water analysis as a part of sample preparation

COMPARATIVE STUDY OF THE OPINIONS REGARDING SAFETY MANAGEMENT ORGANISATION IN CROATIA AND SERBIA

U radu je prikazana usporedna analiza istraživanja stajališta o organiziranju sustava upravljanja sigurnošću koja su provedena u Hrvatskoj i Srbiji. Istraživanje je provedeno metodom ankete pomoću pismenog upitnika koji sadrži 9 osnovnih skupina pitanja. Pitanja obuhvaćaju područja općih podataka o ispitaniku i poduzeću, te stajališta ispitanika o organiziranju upravljanja sigurnošću u poduzeću u kojem rade. U prvom dijelu rada prikazuju se teoretske postavke organiziranja sustava upravljanja sigurnošću. U nastavku rada prikazuje se usporedna analiza provedenog istraživanja u Hrvatskoj i Srbiji. Cilj analize i usporedbe rezultata istraživanja u Srbiji i Hrvatskoj je utvrditi sličnosti, odnosno različitosti u organiziranju sustava upravljanja sigurnošću u ovim zemljama. Zaključci se izvode na temelju usporedbe stajališta o vrstama aspekata organiziranja sustava upravljanja sigurnošću, primjeni organizacijske strukture, vrstama organizacijske strukture, primjeni koraka procesa organiziranja i područjima organiziranja sustava upravljanja sigurnošću, utjecaju organiziranja upravljanja sigurnošću na provedbu sigurnosti i odgovornim osobama za organiziranje sustava upravljanja sigurnošću.The paper presents a comparative study, conducted in Croatia and Serbia, of the opinions expressed by the participants regarding safety management organisation. The study relied on the information gathered in the form of a written questionnaire containing 9 basic sets of questions. The questions covered general information on the participant and the company, and the views of the participants on safety management in the company where they were employed. The paper first focuses on the general theoretical background of safety management organisation. Following this introductory section are the results of the studies conducted in Serbia and Croatia. The goal of the comparative study was to pinpoint similarities and differences in safety management organisation in the two countries. Conclusions were drawn based on the comparisons of participants\u27 views regarding the aspects of safety management organisation, implementation of particular organisational structures, types of organisational structure, and implementation of individual steps in the organisation process. Also assessed by the participants were the individual areas of the safety management system, impact of safety management organisation on safety implementation, and the persons responsible for the organisation of safety management

Leaching of chromium from chromium contaminated soil: Speciation study and geochemical modeling

Distribution of chromium between soil and leachate was monitored. A natural process of percolating rainwater through the soil was simulated in the laboratory conditions and studied with column leaching extraction. Migration of chromium in the soil is conditioned by the level of chromium soil contamination, the soil organic matter content, and rainwater acidity. Chromium (III) and chromium(VI) were determined by spectrophotometric method with diphenilcarbazide in acidic media. Comparing the results of chromium speciation in leachate obtained by experimental model systems and geochemical modelling calculations using Visual MINTEQ model, a correlation was observed regarding the influence of the tested parameters. Leachate solutions showed that the concentration of Cr depended on the organic matter content. The influence of pH and soil organic matter content is in compliance after its definition through experimental and theoretical way. The computer model - Stockholm Humic Model used to evaluate the leaching results corresponded rather well with the measured values

Morphological description and molecular detection of Pestalotiopsis sp on hazelnut in Serbia

In autumn 2015, hazelnut plants with leaf blight symptoms were noticed in a commercial plantation in the Province of Vojvodina, Serbia. Symptomatic samples were collected and submitted to laboratory analysis. Based on morphological characterization, the fungus isolated from the material was initially identified as Pestalotiopsis sp. Pathogenicity tests showed that two selected isolates infected hazelnut leaves and fruits that developed symptoms after artificial inoculation. The pathogen was re-isolated from diseased leaves and fruits, confirming Koch's postulates. Molecular identification was performed with sequence and phylogenetic analysis of ITS, EF1-alpha, and TUB genomic regions. Phylogenetic analysis confirmed the results of the morphological identification. The detection of Pestalotiopsis sp., a causal agent of leaf blight on hazelnut in Serbia, is one of a few reports of these pathogenic fungi on hazelnut

Supporting Information for: "Combined Experimental and Theoretical Investigation of the Origin of Magnetic Anisotropy in Pentagonal Bipyramidal Isothiocyanato Co(II), Ni(II), and Fe(III) Complexes with Quaternary-Ammonium-Functionalized 2,6-Diacetylpyridine Bisacylhydrazone"

Comparison of the EPR spectra of 1 and 2 (Figure S1); additional Mössbauer spectra (Figures S2–S5); Kohn–Sham molecular orbitals with dominant metal d character (Figures S6–S8); calculated principal components of the g-tensor (Table S1); calculated J values (Table S2); transition energies and contributions of the excited states to D and E (Tables S3–S6); d-orbital splitting according to AI-LFT (Table S7); composition of the multideterminant wave function of the ground and selected excited states (Table S8).This is Supplementary information for: Darmanović Darinka, Shcherbakov Igor N., Duboc Carole, Spasojević Vojislav, Hanžel Darko, Anđelković Katarina, Radanović Dušanka, Turel Iztok, Milenković Milica R., Gruden Maja, Čobeljić Božidar, Zlatar Matija, "Combined Experimental and Theoretical Investigation of the Origin of Magnetic Anisotropy in Pentagonal Bipyramidal Isothiocyanato Co(II), Ni(II), and Fe(III) Complexes with Quaternary-Ammonium-Functionalized 2,6-Diacetylpyridine Bisacylhydrazone" 123, no. 51 (2019):31142-31155, [https://dx.doi.org/ 10.1021/acs.jpcc.9b08066 ]The published version of the article: [http://cer.ihtm.bg.ac.rs/handle/123456789/3314]The peer-reviewed version of the article: [http://cer.ihtm.bg.ac.rs/handle/123456789/3269

Combined Experimental and Theoretical Investigation of the Origin of Magnetic Anisotropy in Pentagonal Bipyramidal Isothiocyanato Co(II), Ni(II), and Fe(III) Complexes with Quaternary-Ammonium-Functionalized 2,6-Diacetylpyridine Bisacylhydrazone

Magnetic anisotropy in pentagonal bipyramidal complexes of Co(II) (1 and 2), Fe(III) (3 and 4), and Ni(II) (5) with a 2,2′-[2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)]bis[N,N,N-trimethyl-2-oxoethanaminium] equatorial ligand and isothiocyanato axial ligands has been investigated by magnetic susceptibility measurements, powder X-band electron paramagnetic resonance (EPR) spectroscopy, Mössbauer spectroscopy, ab initio, and ligand-field density functional theory (LFDFT) calculations. The studied complexes display three distinct types of magnetic anisotropy. Co(II) complexes (1 and 2) show an easy plane anisotropy with large and positive D values and negligible rhombicity. The Ni(II) complex (5) has uniaxial magnetic anisotropy with a negative D value. Fe(III) complexes (3 and 4) have small zero-field splitting (ZFS) parameters. Theoretical modeling is used to rationalize the magnetic anisotropy in these systems and to identify the most important excited states that are responsible for the zero-field splitting. These excitations are a consequence of the electronic structure of the central metal ion in ideal pentagonal bipyramidal coordination.This is the authors' peer-reviewed version of the article: Darmanović Darinka, Shcherbakov Igor N., Duboc Carole, Spasojević Vojislav, Hanžel Darko, Anđelković Katarina, Radanović Dušanka, Turel Iztok, Milenković Milica R., Gruden Maja, Čobeljić Božidar, Zlatar Matija, "Combined Experimental and Theoretical Investigation of the Origin of Magnetic Anisotropy in Pentagonal Bipyramidal Isothiocyanato Co(II), Ni(II), and Fe(III) Complexes with Quaternary-Ammonium-Functionalized 2,6-Diacetylpyridine Bisacylhydrazone" 123, no. 51 (2019):31142-31155, [https://dx.doi.org/ 10.1021/acs.jpcc.9b08066 ]The published version: [http://cer.ihtm.bg.ac.rs/handle/123456789/3314]Supplementary data: [https://cer.ihtm.bg.ac.rs/handle/123456789/4438

Supplementary data for the article: Darmanović, D.; Shcherbakov, I. N.; Duboc, C.; Spasojević, V.; Hanžel, D.; Anđelković, K.; Radanović, D.; Turel, I.; Milenković, M.; Gruden, M.; et al. Combined Experimental and Theoretical Investigation of the Origin of Magnetic Anisotropy in Pentagonal Bipyramidal Isothiocyanato Co(II), Ni(II), and Fe(III) Complexes with Quaternary-Ammonium-Functionalized 2,6-Diacetylpyridine Bisacylhydrazone. Journal of Physical Chemistry C 2019, 123 (51), 31142–31155. https://doi.org/10.1021/acs.jpcc.9b08066

Supplementary material for: [https://doi.org/10.1021/acs.jpcc.9b08066]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/3855]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3856

FAKTORI RAZLIKOVANJA IZMEĐU EKSTREMNOG GOVORA I LEGITIMNOG IZRAŽAVANJA U UPOREDNOJ SUDSKOJ PRAKSI

The article focuses on the factors which national and international courts take into consideration when making distinction between extreme speech and legitimate expression. It is often difficult to draw the line between these expressions. There are no general rules which can be automatically applied in such cases. However, certain factors, which can serve as guiding principles for courts, have been developed in the jurisprudence: the context of extreme speech, its content, the speaker’s intent, the position of the speaker and audience, the scope and outreach of extreme speech, and the likelihood of resulting harm. The article explores the application of these factors in particular cases, mostly the ECtHR cases as this court has the most developed case-law on this matter. The authors give their critical opinion on certain decisions and, finally, evaluate the real significance of these factors.Tema članka jesu faktori koje meĎunarodni i nacionalni sudovi razmatraju prilikom pravljenja razlike izmeĎu ekstremnog govora i legitimnog izražavanja. Često je teško povući granicu izmeĎu ova dva. Ne postoje opšta pravila koja bi se automatski mogla primeniti u takvim slučajevima. MeĎutim, u praksi su se razvili pojedini faktori koji mogu služiti kao rukovodna načela sudivima: kontekst, sadžaj govora, namera govornika, pozicija govornika i publike, domašaj govora, kao i verovatnoća da će govor dovesti do štetnih posledica. Članak istražuje primenu ovih faktora u konkretnim slučajevima, i to uglavnom slučajevima Evropskog suda za ljudska prava, čija je praksa po ovim pitanjima najrazvijenija. Autori daju svoje kritičko mišljenje o pojedinim i odlukama i, konačno, ocenjuju stvarni značaj ovih faktora u praksi

DESTABILIZATION AND AGGREGATION OF AQUEOUS HUMIC ACIDS SOLUTION BY METAL IONS UDC 621.385, 677.027

Abstract. The aggregation of soil humic acid (HA) after addition of cations was investigated by nephelometric measurements of HA solution turbidity. Here we show that aggregation is promoted by the presence of positive ions in the solution and that the order of increasing effectiveness in turbidity follows Schulze-Hardy rule. Also, the obtained results indicate that the cation with the largest ionic radius within a common valence is the most effective coagulant. Influence of anions follows the sequence: chloride < nitrate < sulphate, but it is insignificant comparing the influence of cation. This confirms that HA molecules are of negative charge. Key words: cation, humic acid, aggregation, turbidity 1

A study of the influence of ultraviolet radiation on di(2-ethylhexyl) phthalate leaching from poly(vinyl chloride) medical devices

The influence of ultraviolet (UV) radiation on the leaching of di(2- -ethylhexyl) phthalate (DEHP) from 8 different parts of plastic medical devices made of poly(vinyl chloride) (PVC) that are used in two important medical procedures (peritoneal dialysis and transfusion) was investigated. The investigation was performed for three different extraction times (6, 15 and 30 days). DEHP determination was realized by gas chromatography–mass spectrometry (GC-EI– –MS). All the investigated samples contained a significant amount of DEHP. The results showed that some of the set for peritoneal dialysis contained DEHP in higher amounts than samples from the transfusion set. All samples of tubing material showed higher concentration levels of DEHP than the coupled bags. Results obtained after UV treatment showed that UV radiation has a certain influence on DEHP leaching from samples of PVC medical devices. The smallest difference was in the case of the quadruple blood bag from the transfusion set (about 73 % remained), while the biggest difference was obtained for the SAG-M transfer bag, also from the transfusion set, where just 25 % of total content of DEHP remained. The results obtained for DEHP leaching from investigated samples by time showed that most of the samples showed significant differences in the amounts of DEHP leached after 6 and 30 days. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III 41018