Ivana Kostić

University of Nis

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Comparative study of binding strengths of heavy metals with humic acid

Hemijska industrija (2013)

Ivana Kostić Tatjana Andjelković Ružica Nikolić Tatjana Cvetković Dušica Pavlović

The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by method which is based on distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert?s ion exchange method. Experiments were performed at 25 ?C, at pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log ?mn, of complexes formed between the metal ions and humic acid follow the order Co(II) < Ni(II) < Cu(II) > Zn(II) which is the same like in the Irving-Williams series for the binding strength of divalent metal ion complexes. Stability constant of complex between Pb(II) ions and humic acid is greater than stability constants of other investigated metal-humate complexes. The investigation of interaction between heavy metal ions and humics is important for the prediction of the distribution and control of the migration of heavy metals in natural environment.

Divalent

10.2298/hemind121107002k

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Citations (26)

Determination of di(2-ethylhexyl) phthalate in plastic medical devices

Hemijska industrija (2015)

Ivana Kostić Tatjana Andjelković Darko Andjelković Tatjana Cvetković Dušica Pavlović

The presence of DEHP in dialysis and infusion sets for peritoneal dialysis and parenteral nutrition, which are made of PVC and other plastic polymeric materials, were investigated. Phthalate determination was carried out by gas chromatography - mass spectrometry method (GC-MS). The results showed that the peritoneal dialysis set (bag and tubing) made of PVC contains DEHP in significant amount, about 31 - 34%. Solution for peritoneal dialysis which was stored in the investigated PVC bag, contains low amount of DEHP, about 3.72 ?g dm-3. Infusion bottles which are made of LDPE, also contain DEHP but in lower amount than PVC bags. LDPE bottle for packaging physiological saline solution (0.9% NaCl) showed higher amount of DEHP than LDPE bottle for packaging Ringer?s solution. In contrast, solution stored in bottle with lower DEHP level, i.e. Ringer?s solution contained about three times higher concentration of DEHP than physiological saline solution stored in bottle with higher DEHP level. Concentrations of DEHP in Ringer?s solution and physiological saline solution are 17.30 and 5.83 ?g dm-3, respectively. The obtained values are under estimated upper-bound dose of DEHP received by adult patients undergoing procedures of peritoneal dialysis and parenteral nutrition.

Low-density polyethylene

Plastic bottle

10.2298/hemind141129023k

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Citations (13)

UV light impact on phthalates migration from children’s toys into artificial saliva

Journal of the Serbian Chemical Society (2021)

Tatjana Andjelković Danica Bogdanović Ivana Kostić Gordana Kocić Radmila Pavlović

Phthalates has been widely used in children?s toys as plastic plasticizers and softeners. Therefore, attention should be paid to plastic toys, especially those that children can put in their mouths. In this paper quantification of five phthalates: DMP, DnBP, BBP, DEHP and DnOP in plastic toys, as well as irradiation of toys with UV light was performed. After sample preparation and development of the liquid?liquid phthalate extraction method from artificial saliva phthalate quantitative determination using the GC?MS technique was performed. The mean recovery value for DEHP is 77.03?2.76 %. The determination of phthalate in the recipient models (artificial saliva and n-hexane) was performed after 6, 15 and 30 days of the migration test using the GC?MS technique. Based on the known mass % DEHP in the analyzed toys, the percentage of phthalate migration from each analyzed toy to the recipient model after 6, 15 and 30 days of the migration test was calculated. The results show that there is no significant migration of DEHP into artificial saliva, due to high polarity of the recipient (artificial saliva is polar), unlike n-hexane where the migration of DEHP is significant because it is a non-polar solvent.

Plasticizer

10.2298/jsc210928097a

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Toxic effects of a cyanobacterial strain on Chironomus riparius larvae in a multistress environment

Aquatic Toxicology (2022)

Nikola Stanković Boris Jovanović Ivana Kostić Milica Stojković Piperac Jelica Simeunović

Chironomus riparius

Cyanotoxin

10.1016/j.aquatox.2022.106321

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Citations (8)

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

Journal of the Serbian Chemical Society (2018)

Ivana Kostić Tatjana Andjelković Darko Andjelković Tatjana Cvetković Dušica Pavlović

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.

10.2298/jsc180423058k

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The signal response linearity in phthalates determination using ESI-MS method with the Loop injection technique

Savremene tehnologije (2015)

Tatjana Andjelković Gordana Kocić Darko Andjelković Ivana Kostić Danica Milojkovic

The possibility of using ESI-MS technique for the quantitative determination of six most commonly used phthalates (DMP, DnBP, BzBP, DEHP, DiNP, DiDP) was tested. The test was performed by using Loop technique for recording chromatogram obtained after the injection of different phthalates concentrations. The investigation was performed by determining the linear relationship between the concentration of phthalates and the peak areas in the chromatogram of mass range which corresponds to the molecular ion and ion adduct with sodium. The obtained results showed that there is linearity between the concentration of phthalates and peak areas in the chromatogram of monitoring molecular and adduct ions with sodium in case of DiNP (r > 0.999) and DMP (r > 0.999 for the molecular ion; r > 0.989 for the ion adduct with sodium). The results obtained for the molecular ion in DiDP case showed a better linear relationship than the ion adduct with sodium, while the results obtained for BzBP showed opposite values. The same correlation coefficients for both monitoring ions, molecular ion and ion adduct with sodium were obtained for DEHP (r = 0.98371 and 0.98962, respectively). The correlation coefficients DnBP showed lower values than other linear coefficients (r = 0.96034 and 0.94669, respectively). Although the signals of adduct ions with sodium are steady and intense, they are not reliable for quantification since the source of sodium ions is not defined and therefore, the actual amount of sodium in the sample may vary.

Linear correlation

10.5937/savteh1501042a

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Thermal Characterization of the Overload Carbon Resistors

International Journal of Photoenergy (2013)

Ivana Kostić Ljubiša Tomić Aleksandar Kovačević Saša Nikolić

In many applications, the electronic component is not continuously but only intermittently overloaded (e.g., inrush current, short circuit, or discharging interference). With this paper, we provide insight into carbon resistors that have to hold out a rarely occurring transient overload. Using simple electrical circuit, the resistor is overheating with higher current than declared, and dissipation is observed by a thermal camera.

Overheating (electricity)

Inrush current

Transient (computer programming)

10.1155/2013/802789

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Citations (2)

Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process

Steva Lević Nina Obradović Vladimir B. Pavlović Bojana Isailović Ivana Kostić

Polyvinyl Alcohol

Electrospinning

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Simultaneous determination of five phthalates in white spirits using liquid-liquid extraction followed by gas chromatography-mass spectrometry

Advanced technologies (2019)

Danica Bogdanović Tatjana Anđelković Ivana Kostić Gordana Kocić

The aim of this paper is the development of the method for determination of five phthalates in white spirits. Dimethyl phthalate (DMP), di-n-butyl phthalate (DBP), benzyl butyl phthalate (BBP), di-(2-ethylhexyl) phthalate (DEHP) and di-n-octyl phthalate (DOP) were extracted from white spirits by the optimized liquid-liquid extraction (LLE) method. In order to determine the best method for phthalate determination, LLE procedure was optimized by changing the following parameters: the number of extraction repetitions (1-4), the partial removal of ethanol by evaporation from alcoholic samples prior extraction, the type of agitation and the extraction time. Quantification was achieved by gas chromatography-mass spectrometry (GC-MS) with di-n-butyl adipate (DBA) as internal standard. Phthalates were analyzed using a single ion monitoring (SIM) mode and a base ion for each phthalate was chosen (m/z 149 for DBP, BBP, DEHP and DOP and m/z 163 for DMP). The results show that the most effective phthalate extraction with n-hexane as a solvent is achieved with agitation by hand shaking with one-step extraction. Evaporation of ethanol from alcohol drinks provided the increased recovery value for DMP extraction but did not have an impact on the recovery values of DBP, BBP, DEHP and DOP extractions from the samples.

Adipate

Selected ion monitoring

Dimethyl phthalate

Dibutyl phthalate

Diethyl phthalate

10.5937/savteh1901059b

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Citations (2)

COD and BOD correlation of organic compounds of known structure in water

Ivana Kostić Jelica Perović Tatjana Anđelković

Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are the major parameters used for measuring the load of organic carbon into aquatic environment. In this context, this work deals with evaluation of correlation between COD and BOD values of water systems containing organic compounds of known structure. Water systems contained oxalic and benzoic acids. BOD parameter was obtained using instrumental technique with OxiTop® IS 6, Value of COD parameter depends on Mw and number C atoms within organic compound. Increase number of C atoms elevate value of COD parameter. Substances with the same or similar number of C atoms have different values of COD parameter if they have different Mw. There is linear correlation between COD and BOD for organic substances with simple structure. Obtained data for COD comprise 80% of BOD value. The significance of obtained data is that using this correlation of parameters, fast and rough estimation of organic matter content in water could be made. .

Biochemical oxygen demand

Organic compound

Oxalic Acid

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