National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Study of Transfer of Musk Compounds in Abiotic and Biotic Components of Aquatic Ecosystems
Zouhar, Libor ; Hajšlová, Jana (referee) ; Sokol, Jozef (referee) ; Večeřa, Zbyněk (referee) ; Vávrová, Milada (advisor)
This work was focused on the determination of musk compounds in various components of the environment. Synthetic musk compounds are organic substances commonly used as fragrant constituents of detergents, perfumes, cosmetics and other personal care products (PCPs). These compounds contaminate the aquatic environment through municipal wastewater from sewage treatment plants. The result is accumulation of these analytes in the environment and their occurrence in food chain. Synthetic fragrances are commonly detected also in human body; these substances generally belong among relatively new persistent organic pollutants (POPs) because of their persistence, bioaccumulation, and potential toxicity. The aim of this work was to optimize the methods for the determination of selected synthetic fragrances in wastewater (municipal, industrial) and in fish muscle. These analytes were determined in wastewater [the wastewater treatment plant (WWTP) Brno – Modřice, cosmetic manufacturing plant] and in fish Squalius cephalus that had been caught in the river Svratka. The selected analytes (14 substances) originate from the group of nitromusk, polycyclic musk and linear musk compounds. Solid phase microextraction (SPME) [for wastewater samples] and pressurized solvent extraction (PSE) [for fish samples] were used for isolation of analytes from real samples. The identification and quantification of analytes were carried out by high resolution gas chromatography coupled with mass spectrometry detection (GC-MS). The results show that galaxolide (g.L-1) and tonalide (tenths of g.L-1) were polycyclic musk compounds which were found at the highest concentration level in influent and also in effluent samples from the WWTP Brno – Modřice. The most extended nitromusk compound was musk ketone (hundredths of g.L-1). Linear musk compounds were detected in all influent samples (g.L-1). The overall removal efficiency of synthetic musk compounds from wastewater in the WWTP varies within the following ranges: nitromusk compounds 34.4 % – 85.4 %, polycyclic musk compounds 36.7 % – 53.3 % and linear musk compounds 90.5 % – 99.9 %. On the basis of the results it can be stated that wastewater (effluent from the WWTP) is the primary source of musk compounds, especially of the polycyclic ones in the environment. It has been also shown that ultrafiltration used in a cosmetic plant is a highly efficient technology for removing nitromusk and polycyclic musk compounds from industry wastewater. The results from evaluation of the fish contamination by musk compounds show that galaxolide was the substance which reached the highest concentration levels (tens of l.w.). The results corroborate ubiquitous occurrence of musk compounds in the environment and reduction of using of nitromusk compounds due to their potential toxic properties. It has been shown that the insufficiency of the purifying procedures used in the WWTP Brno – Modřice has a significant influence on the concentration level of polycyclic musk compounds (tonalide, galaxolide) in fish caught from the river Svratka.
Musk compounds in water biota
Zouhar, Libor ; Stoupalová, Michaela (referee) ; Vávrová, Milada (advisor)
Synthetic musk compounds (MUSK) or synthetic fragrances are organic substances commonly used as fragrant constituents of perfumes, detergents, cosmetics and personal care products. These compounds are discharged after use via domestic wastewater and sewage treatment plants to the aquatic environment. The result is accumulation in the environment and occurrence in a food chain especially of aquatic and marine ecosystems. Synthetic musk compounds are also found in surface water, fish tissues and also in body fluid (blood, urine, milk) and tissues of human body. Quantitative detection and studying properties of these compounds is an important activity because we have low knowledge about their fate in the environment (persistence, bioaccumulation) and toxicity. This diploma thesis is focused on three commonly used synthetic fragrances – tonalide, musk ketone and musk xylene. The base of this study was to perform a method optimisation for the determination of selected compounds in water and water biota (fish). The aim was determination of selected musk compounds in real samples (water, fish) and evaluation of the results. Pressurized solvent extraction (PSE) for fish samples and solid phase microextraction (SPME) for water samples were used for isolation of analytes from samples. The identification and quantification of analytes was carried out by high resolution gas chromatography – mass spectrometry.
Evaluation of occurence of musk compounds in water ecosystem
Tobková, Lenka ; Zouhar, Libor (referee) ; Vávrová, Milada (advisor)
This bachelor’s thesis is concerned with synthetic musk compounds and their presence in the environment, particularly in water ecosystem. The thesis contains fundamental classification of synthetic musk compounds together with specification and detailed description of their most significant representatives. Among them are linalool, citronellol, and isobornyle acetate which will be studied further in master’s thesis. Fundamental physical-chemical properties of these odoriferous compounds and their toxicological and environmental impact are studied. Also part of this thesis is a detailed description of synthetic musk compounds’ analytical determination.

See also: similar author names
1 Zouhar, Luděk
1 Zouhar, Lukáš
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