Papers by Svetlana Hrouzková
Separations, Mar 25, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
ChemInform, Jun 5, 2014
Review: 69 refs.
Chemické listy
Analysis of honeybees and their products can provide crucial information about the degree of envi... more Analysis of honeybees and their products can provide crucial information about the degree of environmental contamination by pesticide residues. One of the promising products is propolis tincture which is a complex mixture. It is essential to modify the procedure in order to reduce the potential contamination of the analytical instrument used to determine pesticides. QuEChERS sample preparation method (acronym of Quick, Easy, Cheap, Effective, Rugged and Safe) for the extraction of pesticides from the propolis tincture was proposed. Satisfactory extraction recoveries in the range of 70–120 % for 43 out of 47 pesticides have been obtained using C18, PSA and Florisil cleaning sorbents in the second step of QuEChERS procedure. Matrix effects and influence of interferences on the chromatographic signal were studied in detail.
Journal of Apicultural Research, Dec 19, 2022
Applied sciences, Dec 29, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Separations, Jul 23, 2021
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Nova Biotechnologica et Chimica, Jul 1, 2018
Single drop microextraction (SDME) nowadays earns an increasing attention by scientists due to it... more Single drop microextraction (SDME) nowadays earns an increasing attention by scientists due to its simplicity, low cost and the need for only common laboratory equipment. This microextraction technique combines sample cleanup and pre-concentration of analytes in one step. Furthermore, a significant reduction in the amount of organic solvents needed comparing to standard LLE techniques places SDME into the position of environmental friendly extraction techniques. SDME is a straightforward technique in which a micro-drop of solvent is suspended from the tip of a conventional micro-syringe and then it is in a direct contact with a sample solution in which it is immiscible or it could be suspended in the headspace above the sample. The paper overviews developments of the stateof-the-art SDME techniques for the extraction of harmful organic compound and pollutants from environmental, food and biological matrices. Key extraction parameters essential for SDME performance were described and discussed.
Acta Chimica Slovaca, Apr 1, 2018
Single drop microextraction technique uses microamounts of organic solvents. Simplicity, low cost... more Single drop microextraction technique uses microamounts of organic solvents. Simplicity, low cost, low environmental impact, compatibility with chromatographic systems as well as its applicability to different matrices are main advantages of single drop microextraction. This technique has become frequently used for the extraction of a broad scope of compounds for numerous analytical applications. This review provides an overview of the existing single drop microextraction modes of realisation and the main scope is devoted to the optimization of parameters influencing the efficiency. The state of the art is discussed on the basis of examples selected from representative application areas. Extraction parameters for toxic organic compounds extraction and microdrop stability were evaluated.
Applied sciences, Oct 21, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Food Analytical Methods, Jun 30, 2020
In this study, a combination of modified quick easy cheap effective rugged and safe extraction (Q... more In this study, a combination of modified quick easy cheap effective rugged and safe extraction (QuEChERS) and dispersive liquid–liquid microextraction (DLLME) has been proposed for the extraction and preconcentration of multiclass pesticide residues from yogurt samples prior to their determination by fast gas chromatography–mass spectrometry. Factors influencing DLLME efficiency, including type and volume of extractive solvent, mixing type, salt addition, and extraction time were evaluated. The obtained extract from the first step of QuEChERS was subsequently adjusted by DLLME using tetrachloroethane as an extractive solvent. The method was fully validated within the optimized extraction parameters. The recoveries of pesticides were between 70 and 120% with relative standard deviations less than 20%. The limits of detection ranged between 0.04 ng/L and 2.00 μg/L, and the limits of quantification ranged from 0.12 ng/L to 6.60 μg/L. The optimized method was employed for the determination of pesticides in real samples of yogurts.
Journal of Chromatography A, Jul 1, 2017
Please cite this article in press as: S. Hrouzková, et al., Development of fast, efficient and ec... more Please cite this article in press as: S. Hrouzková, et al., Development of fast, efficient and ecological method employing vortex-assisted dispersive liquid-liquid microextraction combined with fast gas chromatography-mass spectrometry for pesticide residues analysis in alcohol-content samples,
Journal of Chromatography A, Oct 1, 2018
A method was developed for determination of fipronil (FIP) pesticide and its three major degradat... more A method was developed for determination of fipronil (FIP) pesticide and its three major degradates (fipronil desulfinyl, fipronil sulfide, fipronil sulfone) in water at the levels required by the EU Commission in the Decision 2022/1307. The method combines solvent-free stir bar sorptive extraction (SBSE) with thermal desorption–gas
chromatography–tandem mass spectrometry (TD–GC–MS/MS). Simple sample processing involves 16 h of stirring a 100 mL water sample with a polydimethylsiloxane-coated sorptive stir bar, followed by TD of the trapped analytes into the GC. The greenness assessment by analytical Eco-Scale approach resulted in classification of the entire analytical method as "an excellent green analysis". The obtained limits of quantification for all FIPs determined in tap, lake, MilliQ water and artificial seawater were in the range of 0.12–0.30 ng L–1. The recoveries ranged between 81.7 and 109% with relative standard deviations from 2.8 to 14%. The results show that the method is suitable for screening and monitoring the studied analytes in selected matrices.
Applied Sciences
This study presents a compact system developed to treat paint-industrial water contaminated by th... more This study presents a compact system developed to treat paint-industrial water contaminated by the residues of volatile organic compounds (VOCs) using hybrid electrothermochemical wastewater treatment technology. Different treatment parameters (sample dilution, working current) were studied, and the power of the removal was expressed by the removal efficiency factor. It was shown that for all of the VOCs, significant removal was obtained with dilution 1:3 (industrial water: deionized water, V:V) and electric current set at 30 A. For advanced inspection of the treatment process, a simple and solventless method has been developed and validated, using headspace sampling combined with gas chromatography-mass spectrometry. Parameters affecting the headspace sampling efficiency were thoroughly studied, including the temperature, time, and mixing rate. The proposed method was partially validated utilizing the selected sampling parameters. The limits of detection ranged between 0.19 µg/L an...
Applied Sciences
High amounts of industrial wastewater are generated by the ever-growing demand and production of ... more High amounts of industrial wastewater are generated by the ever-growing demand and production of paint and coating materials. These effluents have negative effects on human health and the environment. The source of industrial effluents highly influences the properties, composition, and content of pollutants. The manufacturing of paint and coatings uses huge volumes of water and chemical reagents, consequently producing huge volumes of heavily polluted wastewater. This review is focused on summarizing various methods of industrial wastewater treatment from the paint manufacturing industry. Current trends in paint industry wastewater treatment processes have resulted in high efficiency of the reduction of chemical oxygen demand. Factors affecting the treatment processes are discussed and future trends are outlined. The effectiveness of the recently used methods is compared and the limitations of advanced treatment systems are highlighted. The review of recent developments in paint ind...
Chemické listy
The paper overviews analytical methods for the detection of a variety of contaminants, such as pe... more The paper overviews analytical methods for the detection of a variety of contaminants, such as pesticide residues, polyaromatic hydrocarbons, polychlorinated biphenyls, etc. in environmental samples – crustaceans and mollusks. Complexity of analyzed samples requires a sophisticated sample preparation: mostly two-step procedures include an extraction followed by a clean-up of the extract. QuEChERES technique complies with the requirements of the green analytical chemistry and is preferred for the isolation of pesticide residues. Polyaromatic hydrocarbons are extracted from samples utilizing Soxhlet extraction. For the isolation of a variety of contaminants, liquid-liquid extraction, ultrasound assisted and microwave assisted extraction, accelerated solvent extraction as well as matrix solid phase dispersion are employed. Because of the complexity of samples, a clean-up by sorbents or gel permeation chromatography are used. For the separation, gas or liquid chromatography connected wi...
Acta Chimica Slovaca
As a result of massive bee deaths in recent years, beekeeping is raising concerns about the prese... more As a result of massive bee deaths in recent years, beekeeping is raising concerns about the presence of pesticides in propolis which is considered as a safe product. The paper is focused on the analysis of bee propolis and propolis-based products using various chromatographic techniques using mass spectrometry detection predominantly. An important part of the work is an overview concerning methods of sample preparation, extraction, and purification of extracts, followed by separation and detection techniques. Positive findings of contaminants and their concentrations in propolis samples and propolis products were evaluated. Sorption based techniques such as matrix solid phase dispersion and solvent-based extraction techniques are frequently applied for propolis analysis in connection with chromatographic techniques. Liquid-based extractions, such as the QuEChERS extraction technique (Quick, Easy, Cheap, Effective, Rugged, Safe), combine extraction by solvent with several ways of ext...
Chemicke Listy, 2002
A survey of fast GC applications to analysis of volatile and semivolatile compounds is presented.... more A survey of fast GC applications to analysis of volatile and semivolatile compounds is presented. The most frequently analysed samples, sample introduction modes, experimental conditions and instrumentation are discussed in detail. The analysis times and detection limits are summarised.
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Papers by Svetlana Hrouzková
chromatography–tandem mass spectrometry (TD–GC–MS/MS). Simple sample processing involves 16 h of stirring a 100 mL water sample with a polydimethylsiloxane-coated sorptive stir bar, followed by TD of the trapped analytes into the GC. The greenness assessment by analytical Eco-Scale approach resulted in classification of the entire analytical method as "an excellent green analysis". The obtained limits of quantification for all FIPs determined in tap, lake, MilliQ water and artificial seawater were in the range of 0.12–0.30 ng L–1. The recoveries ranged between 81.7 and 109% with relative standard deviations from 2.8 to 14%. The results show that the method is suitable for screening and monitoring the studied analytes in selected matrices.
chromatography–tandem mass spectrometry (TD–GC–MS/MS). Simple sample processing involves 16 h of stirring a 100 mL water sample with a polydimethylsiloxane-coated sorptive stir bar, followed by TD of the trapped analytes into the GC. The greenness assessment by analytical Eco-Scale approach resulted in classification of the entire analytical method as "an excellent green analysis". The obtained limits of quantification for all FIPs determined in tap, lake, MilliQ water and artificial seawater were in the range of 0.12–0.30 ng L–1. The recoveries ranged between 81.7 and 109% with relative standard deviations from 2.8 to 14%. The results show that the method is suitable for screening and monitoring the studied analytes in selected matrices.