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Bulletin of the Chemists and Technologists of Bosnia and Herzegovina
Issue 59
Publication date: December 2022 |
Full version Bulletin |
Table of contents
Investigation of Inhibitory Effect of the Rubus idealis L. Extract on Corrosion of Copper Original Scientific Article
Kasapović, D., Klepo, L., Ostojić, J., Korać, F.
DOI: 10.35666/2232-7266.2022.59.01
UDK: 620.196[546.56:582.711.712]
Abstract: The aim of this work was to examine the impact of raspberry extract (Rubus idaeus L.) on copper corrosion characteristics. The raspberry leaf extract was prepared using Soxhlet extraction with ethanol as solvent. The estimation of the total polyphenol content in the obtained sample was determined by UV/Vis spectrophotometric method. The identification and quantification of phenolic acids was performed using HPLC analytical method.In addition, the aim of this work was to examine the impact of individual phenolic compounds (rutin, gallic acid, quercetin, and catechin hydrate) on the corrosion properties of copper. . , The corrosion rate of copper with the extract of the raspberryleafof the Polkavariety was tested. A copper corrosion test was performed in a 3% NaCl solution without and in the presence of the extract. The copper polarization resistance (Rp) values in 3% NaCl solution without and in the presence of the extract weredetermined by the linear polarization method. The corrosion behavior of copper in 3% NaCl solution without and in the presence of extract was determined by specific electrochemical parameters: corrosion potential (Ecorr), corrosion current density (Icorr), and slopes of the anode (βa) and cathode (βk). The electrochemicalimpedance spectroscopy method was used to examine the corrosion behavior of copper in 3% NaCl solution without and in the presence of extract. The results obtained by Tafel extrapolation showed that the corrosion rate decreases in the presence of the tested extract. Studies conducted by the electrochemical impedance spectroscopy method show that the tested extract slows down the kinetics of the corrosion process, which is visible through an increase in resistance. The results confirm that the examined extract can be used for protection in an aggressive medium, such as a 3% NaCl solution.
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina 59, 1-9.
Optimization and Validation of Europium-Sensitized Fluorescence Method for Determination of Tetracycline Antibiotics in Water from Fish Farms Original Scientific Article
Bečić, E., Dedić, M., Imamović, B., Omeragić, E.
DOI: 10.35666/2232-7266.2022.59.02
Abstract: Sensitized europium fluorescence was used for simple, fast and efficient determination of tetracycline residues in water from fish farms. Tetracycline antibiotics: oxytetracycline (OTC), tetracycline (TC) and chlortetracycline (CTC) were extracted from water samples using polymeric hydrophilic–lipophilic balanced cartridges. After evaporation and pre-concentration, tetracyclines form a complex with europium and citric acid as coligand at pH 8.5. The complex formed has a wide absorption spectrum at 388 nm and a narrow emission maximum at 619 nm resulting from the 5D0 - 7F2 transition within the europium ion. The complex is stable with intensive fluorescence and linear in the concentration range of 5-2500 µg/L for tetracycline and oxytetracycline and 5-1000 µg/L for chlortetracycline. The detection limit was 0.68 µg/L for OTC, 1.29 µg/L for TC and 0.65 µg/L for CTC, respectively.The proposed method is very sensitive and particularly applicable to samples where low concentrations of tetracycline antibiotics are expected.
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina 59, 11-16.
Correlation between antioxidant and physicochemical parameters of honey samples from Bosnia and Herzegovina and Turkey Original Scientific Article
Samardzic, M., Ibragic, S.*
DOI: 10.35666/2232-7266.2022.59.03
UDK: 613.162:577.1(497.6+560)
Abstract: The aim of this study was to determine the association value between the following parameters and the antioxidant properties of honey: colour, phenolics content (TPC), flavonoid content (TFC), proline and ascorbic acid content. The samples were collected in Bosnia and Herzegovina and Turkey and included honeydew, monofloral and polyfloral honey. The antioxidant activity of honey samples was determined using the ABTS and DPPH assays. Based on the correlation matrix, the main findings revealed a strong correlation between antioxidant activity and TPC, TFC, proline content and colour. Honey colour was in best correlation with the TFC (r = 0.910, p < 0.001) where dark coloured honeys showed a higher TFC, however antioxidant activity showed a highly significant dependence on theTPC (DPPH-TPC: r = - 0.872; ABTS-TPC: r = - 0.783, p < 0.001). Ascorbic acid was not established as a predictive parameter that can be used to estimate the antioxidant properties of honey and did not significantly correlate with any of the remaining variables.
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina 59, 17-26.
Bioaccumulation of metals in fish from hydro-accumulations on the Neretva River, Bosnia and Herzegovina used in different diets Original Scientific Article
Bobar, D., Huremović, J., Korjenić, E., Selović, A., Bobar, S., Šehović, E.
DOI: 10.35666/2232-7266.2022.59.04
UDK: 543:597(497.6 Neretva)
Abstract: There is a growing need to assess the level of contaminants in fish as bioindicators of the health and well-being of fish and humans as its consumers. Contamination by heavy metals (Cd, Cr, Cu, Fe, Mn, Pb, Zn) was evaluated using atomic absorption spectrometer, flame and graphite furnace technique in the water samples and fish muscle tissues of Sander lucioperca, Leuciscus svallize and Tinca tinca of four hydro-accumulation lakes on the Neretva River, Bosnia and Herzegovina.Samples were collected during two seasons: autumn-winter and spring-summer (2019). It has been shown that iron (Fe) was the highest accumulating metal in fish, whilst cadmium (Cd) and lead (Pb) were the lowest. Heavy metals contents were below the maximum permissible for drinking water and for fish as prescribed by national legislation. According to correlation matrix between metals content in all fish during both fishing seasons, the highest values of the Pearson coefficient were obtained in the case of essential elements (Fe, Mn, Cu and Zn) and Fe and Mn also had a statistically significant correlation with Cd and Pb. Furthermore, potential health risk assessment exposure of the adult population in B&H revealed that none of the seven heavy metals pose risk to human health, based on the estimated daily intake via consumption of these fish species as well as target hazard quotient and hazard index values less than 1.
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina 59, 27-35.
Percolation and jamming properties in limited grain growth of linear objects Original Scientific Article
Dujak, D., Karač, A., Budinski-Petković, Lj., Jakšić M. Z.,, Vrhovac B. S.
DOI: 10.35666/2232-7266.2022.59.05
UDK: 631.53.027[62-493:67.014]
Abstract: The physical and chemical properties of the nanocrystals are highly shape dependent, and shape control has become very important. The seeded growth method enables seeds to grow in a predetermined way. We have already proposed such amodel that can reproduce the granular growth on a triangular lattice and for different growth shapes. In this paper, however, we have introduced a limitation on seed growth up to a certain length. This method can be used when the growth of all seeds have to be limited to the same length, or for a mixture with the different growth limits.The main goal is to investigate how the growing limits affect the values of the percolation threshold and jamming density, and whether large objects significantly affect the percolation threshold. We used growing needle-shaped objects (k-mers) made by a self-avoiding random walk filling the nodes of the triangular lattice. Objects can grow until they reach the growth limit k' defined as the maximum number of lattice nodes belonging to one object. For k' ≥10 percolation is reached for all investigated seed densities. We obtained that the values of the percolation threshold and jamming density are identical for k' ≥10k .Above these values, the percolation threshold and jamming remain unchanged, regardless of the growth limit.Our results also show that when significant growth is allowed, long objects are very rare and do not influence the results.
Bulletin of the Chemists and Technologists of Bosnia and Herzegovina 59, 37-42.