Browsing by Subject "spectrophotometry"

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Access status: Restricted ,
Biosorbenty do usuwania barwników z wody
(Data obrony: 2018-01-24) Ciesielska, Aleksandra
Wydział Energetyki i Paliw
Access status: Open Access ,
Spectrophotometry application for the montmorillonite content determination in moulding sands with bentonite
(2011) Grabowska, Beata; Holtzer, Mariusz; Kot, Iwona; Kwaśniewska-Królikowska, Dominika
The theoretical bases of spectrophotometry used in analysis are discussed in the paper as well as the results of investigations of the montmorillonite content by means of the spectrophotometric adsorption of the Cu(II)-triethylenetetramine (Cu-TET) complex are presented. Bentonites originated from various producers (Sud Chemie, ZGM Zębiec S.A,) as well as samples of model moulding sands bonded by these bentonites were inwestigated in respect of their montmorillonite content. The montmorillonite content was measured in samples being at a room temperature and at temperatures of 400 °C and 700 °C. It was indicated, that the determined montmorillonite content in bentonite for the bentonites under investigation and for the model moulding sands with bentonites, are comparable, which proves that the quartz matrix, does not disrupt the measuring methodology and the applied spectrophotometric method is suitable for the moulding sands. It was found that at a temperature of 700 °C montmorillonite undergoes deactivation in the tested bentonites.
Access status: Open Access ,
The attempts to identify the sources of the emission of phenol compounds in the upper Dunajec catchment
(2011) Michałowski, Maciej
Dunajec, a river in south Poland, together with the San River, is the most important right-bank tributary of the Vistula River. It flows into the Vistula River at its 160.6 km. The Upper Dunajec area starts at the spring and ends at the mouth of the Ochotnica stream (including the stream itself). The catchment of the upper Dunajec is placed in two districts: Tatrzański and Nowotarski. It is very important to keep the catchment as clean as possible due to the fact that it supplies both districts with drinkable water. The goal of my paper was to find out to what extent the upper Dunajec catchment was contaminated with phenols. All contaminants in water mostly come from chemical substances, bacteria and other microorganisms that are present in natural waters in huge amounts. These contaminants are permanent and resistant towards chemical or biochemical processes that are supposed to purify the water. Phenol and its derivatives are very toxic, ones of the most burdensome compounds for the environment. Sources of phenol compounds emission can be divided into two groups: of natural and of anthropogenic origin, i.e. resulting from human activity in industry, agriculture as well as in tourism. The most dangerous substances that cause contamination of water with phenols are wastewaters coming from plastics, paint pigments, varnish or glue factories and from pharmaceutical companies. Municipal wastewaters tend to contaminate water with phenols as well, however to smaller extent. Phenol and its derivatives are widely used in many branches of industry as well as in agriculture. In order to mark phenol concentrations, I applied the photometric method.
Access status: Restricted ,
Walidacja metody oznaczania azotynów w wodach podziemnych
(Data obrony: 2018-08-01) Gurgul, Karolina
Wydział Geologii, Geofizyki i Ochrony Środowiska
Zgodnie z wymogami normy PN-EN ISO/IEC 17025:2005 laboratoria są zobowiązane do wykonywania walidacji stosowanych metod badawczych. Przedstawiony w pracy proces walidacji metody spektrofotometrycznej do oznaczania azotynów w wodach podziemnych miał na celu sprawdzenie, czy metoda daje rzetelne i precyzyjne wyniki. Po zdefiniowaniu problemu badawczego wyznaczono parametry charakterystyczne metody, tj. liniowość, dokładność i odzysk, precyzję, granicę wykrywalności i oznaczalności, stabilność oraz niepewność pomiaru. Otrzymane wyniki porównano z wartościami referencyjnymi zawartymi w obowiązujących aktach prawnych. Parametry porównano z wymaganiami i formalnie stwierdzono przydatność metody do oznaczania azotynów w wodach podziemnych.