Organic pollution in sediment-water systems on the Ratno Ostrvo location in Novi Sad, Serbia and Montenegro

ABSTRACT: Two-year (2001Two-year ( -2002 monitoring was conducted to determine residues of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides in sediment-water systems of three types of watercourses on the location of Ratno Ostrvo in Novi Sad (Serbia and Montenegro). Types of watercourses were established on the basis of the flow regime: drainage ditches with 1-2 m 3 /s (four sampling points), the DTD Canal with up to 10 m 3 /s (three sampling points) and the Danube River with 1500-3000 m 3 /s (five sampling points). Water quality was compared with the requirements given by the national and Dutch regulations, and the quality of sediment with the Dutch and Canadian quality guidelines, due to the lack of national legislaton. Based on the concentrations of organic pollutants in the samples of sediments and water from selected sampling points, average annual values were computed for the three types of watercourses. Great differences regarding the level of pollution between two years of monitoring were in smaller watercourses -drainage ditches and the DTD Canal, which might be a consequence of water flow, increased anthropogenic activity, decrease of self-purification potential. Concentrations of both PAHs and pesticides were below national maximum permissible levels in water and below Dutch intervention levels in sediment. Standard deviations of average annual concentrations were very high (up to 30-300%), probably because of the increased anthropogenic effect

Determination of polymer additive residues that migrate from coffee capsules by means of stir bar sorptive extraction-gas chromatography-mass spectrometry and PARAFAC decomposition

This paper reports on the difficulties encountered when developing an analytical method for ultra-trace determination, in a complex matrix, of plastic additive residues which are ubiquitous in the laboratory. The simultaneous qualitative and quantitative determination of an antioxidant (2,6-di-tert-butyl-4-methyl-phenol, BHT), an UV stabilizer (benzophenone, BP), and a plasticizer (diisobutyl phthalate, DiBP), released from plastic capsules is carried out in coffee by means of GC–MS and parallel factor analysis decomposition. Stir bar sorptive extraction is used to extract and concentrate the analytes. Coffee samples are prepared with Milli-Q water, which contains residues of the target compounds, which can be significant for ultra-trace analysis and should be subtracted. In addition, matrix effect exits in coffee, so standard addition method is used. The residue concentrations released from the coffee capsules into the solid coffee are around 3, 1, and 12 μg kg−1 of BHT, BP and DiBP, respectively.Spanish MINECO (AEI/FEDER, UE) through project CTQ2017-88894-R and by Consejería de la Junta de Castilla y Le´on through project BU052P20 (both co-financed with European FEDER funds). L. Valverde-Som thanks JCyL for her postdoctoral contract through BU052P20project

17th ICCE Satellite Event University Education in Environmental Sciences

Recently, nearly 500 study programmes related to environmental disciplines were detected in Europe (Lammel et al, Environ Sci Pollut Res 21:7211-7218 2014). Following good practice from the 16th International Conference on Chemistry and the Environment (ICCE) in Oslo, during the 17th ICCE that took place in Thessaloniki, Greece, between 16 and 20 June 2019, a special Satellite Event dedicated to University Education in Environmental Sciences was organised. The session attracted students, teachers and experts from academia and industry/consulting. As conveners of the event, our aim was to provide an inspirative platform for presentation and discussion of curricula, present and future teaching methods and tools, and existing and new concepts of higher education of environmental topics

Pentachlorobenzene sorption onto sediment organic matter

Sorption behaviour of pentachlorobenzene on four humic acids (HAs) and two humins extracted from a take sediment was studied. The objective was to provide a better understanding of the sorption mechanism of pentachlorobenzene onto sediment organic matter. Ten HAs were obtained by progressive sequential extraction of a sediment sample, while the residue after extraction was separated into two humin fractions on the basis of organic carbon content. The structural heterogeneity of the HAs and humins was characterized using elemental analysis and diffuse reflectance Fourier transform infrared spectroscopy. All sorption isotherms, fitted to a Freundlich equation, were nonlinear. For the HAs, isotherm linearity increased from 0.902 for the first extracted HA to 0.945 for the tenth HA, showing increase in the nonlinearity of the associated sorption isotherms with increasing HA aromaticity. On the other hand, a positive correlation between sorption coefficient and aliphaticity of the HAs supports the hypothesis that the non-polar aliphatic domains in sediment organic matter strongly affect the sorption of hydrophobic organic compounds. Both humin samples showed greater nonlinearity than the HAs, with the greatest degree of nonlinearity (0.827) for the humin with lower organic carbon content, while humin with higher organic carbon content showed the greatest pentachlorobenzene sorption affinity. It has been suggested that sorption processes may be strongly affected by the physical conformation of, and accessibility to, organic matter, as demonstrated by the high K-oc and low n of humin samples. (c) 2007 Elsevier Ltd. All rights reserved

Pentachlorobenzene sorption onto sediment organic matter

Sorption behaviour of pentachlorobenzene on four humic acids (HAs) and two humins extracted from a take sediment was studied. The objective was to provide a better understanding of the sorption mechanism of pentachlorobenzene onto sediment organic matter. Ten HAs were obtained by progressive sequential extraction of a sediment sample, while the residue after extraction was separated into two humin fractions on the basis of organic carbon content. The structural heterogeneity of the HAs and humins was characterized using elemental analysis and diffuse reflectance Fourier transform infrared spectroscopy. All sorption isotherms, fitted to a Freundlich equation, were nonlinear. For the HAs, isotherm linearity increased from 0.902 for the first extracted HA to 0.945 for the tenth HA, showing increase in the nonlinearity of the associated sorption isotherms with increasing HA aromaticity. On the other hand, a positive correlation between sorption coefficient and aliphaticity of the HAs supports the hypothesis that the non-polar aliphatic domains in sediment organic matter strongly affect the sorption of hydrophobic organic compounds. Both humin samples showed greater nonlinearity than the HAs, with the greatest degree of nonlinearity (0.827) for the humin with lower organic carbon content, while humin with higher organic carbon content showed the greatest pentachlorobenzene sorption affinity. It has been suggested that sorption processes may be strongly affected by the physical conformation of, and accessibility to, organic matter, as demonstrated by the high K-oc and low n of humin samples. (c) 2007 Elsevier Ltd. All rights reserved