|
|
Distribution of synthetic fragrances into the aquatic ecosystem
Freithová, Štěpánka ; Tulková, Tereza (referee) ; Vávrová, Milada (advisor)
Synthetic fragrances are part of many consumer products, from which they get to waste water and to water recipient due to imperfect cleaning. Musk compounds can be found in almost every parts of nature environment. Purpose of this bachelor thesis was assesment of selected representatives linear musk compounds, concretely citronellol, isobornyl acetate, allyl cyklohexyl propionate and hexylcinnamic aldehyde. This analytes were determined in waste water in inflow and outflow from wastewater treatment plant in Brno-Modřice and wastewater treatment plant in area Veterinary and Pharmaceutical university Brno. Analytes were extracted by using method of solid phase microextraction, final assesment was done method of gas chromatography with mass spectrometry detection. Results were evaluated and it was found, that musk compounds are present in waste water in concentration range from 0,01 to 3,6 ng/ml.
|
|
|
Characterization of peat
Freithová, Štěpánka ; Mikšík, František (referee) ; Kotlík, Josef (advisor)
Peatlands are considered to be valuable ecosystems on the Planet and play an important role in many processes globally likewise and in the landscape. They are important for maintaining a global biodiversity, play an important role in landscape hydrology and can be a source of drinking water. They can help minimize floods and contribute to climate change mitigation. The peat bogs are one of the largest terrestrial carbon reservoirs. They have been storing carbon for centuries. Many of peat functions are affected due to human activities. It can result into release of greenhouse gases into atmosphere and the excretion of organic carbon into watercourses. The subject of the thesis is understanding of the mechanisms of water binding in peat and exploring possible dependencies within the depth profile of the peatlands using thermal analytical methods, more preciously using thermogravimetry (TG) and differential scanning calorimetry (DSC). The stability of water molecule bridge (WaMB) was investigated. It was found out that the minimum temperature required for WaMB abatement decrease and the whole structure becomes less stable with increasing peat layer depth. Water release processes were evaluated with the meaning of the TGA measurements. A decreasing trend in the degradation of thermolabile substances and an increasing trend in thermostable substances within the peat profile were observed.
|
|
|
Characterization of peat
Freithová, Štěpánka ; Mikšík, František (referee) ; Kotlík, Josef (advisor)
Peatlands are considered to be valuable ecosystems on the Planet and play an important role in many processes globally likewise and in the landscape. They are important for maintaining a global biodiversity, play an important role in landscape hydrology and can be a source of drinking water. They can help minimize floods and contribute to climate change mitigation. The peat bogs are one of the largest terrestrial carbon reservoirs. They have been storing carbon for centuries. Many of peat functions are affected due to human activities. It can result into release of greenhouse gases into atmosphere and the excretion of organic carbon into watercourses. The subject of the thesis is understanding of the mechanisms of water binding in peat and exploring possible dependencies within the depth profile of the peatlands using thermal analytical methods, more preciously using thermogravimetry (TG) and differential scanning calorimetry (DSC). The stability of water molecule bridge (WaMB) was investigated. It was found out that the minimum temperature required for WaMB abatement decrease and the whole structure becomes less stable with increasing peat layer depth. Water release processes were evaluated with the meaning of the TGA measurements. A decreasing trend in the degradation of thermolabile substances and an increasing trend in thermostable substances within the peat profile were observed.
|
|
|
Distribution of synthetic fragrances into the aquatic ecosystem
Freithová, Štěpánka ; Tulková, Tereza (referee) ; Vávrová, Milada (advisor)
Synthetic fragrances are part of many consumer products, from which they get to waste water and to water recipient due to imperfect cleaning. Musk compounds can be found in almost every parts of nature environment. Purpose of this bachelor thesis was assesment of selected representatives linear musk compounds, concretely citronellol, isobornyl acetate, allyl cyklohexyl propionate and hexylcinnamic aldehyde. This analytes were determined in waste water in inflow and outflow from wastewater treatment plant in Brno-Modřice and wastewater treatment plant in area Veterinary and Pharmaceutical university Brno. Analytes were extracted by using method of solid phase microextraction, final assesment was done method of gas chromatography with mass spectrometry detection. Results were evaluated and it was found, that musk compounds are present in waste water in concentration range from 0,01 to 3,6 ng/ml.
|
guest ::
