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Comparision of methods for sulphide determination
Zlámalová, Magda ; Nesměrák, Karel (advisor) ; Červený, Václav (referee)
The aim of this work is determination of sulphides in a solution by suitable methods and it's subsequent comparison from a point of view to the precision, financial and time demands. Iodometric titration, argentometric titration, and potassium ferricyanide titration were chosen for the determination of sulphides in the solution. Anhydrous sodium sulphide and sodium sulphide hydrate were used as model samples. From the point of view to financial and time demands the most advantageous method was potassium ferricyanide titration and the least advantageous method was iodometric titration. The precision of used methods was dependent on type of used sample. Iodometry was the least precise determination of sulphides in the sample of anhydrous sodium sulphide; the precision of argentometry and potassium ferricyanide titration was comparable. Potassium ferricyanide titration was the most precise determination of sulphides in the sample of sodium sulfide hydrate; the least precise determination was argentometry.
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Health aspects of salt in food
Wűrzová, Anna ; Bušová, Milena (advisor) ; Králíková, Eva (referee)
Sodium chloride is an integral part of our nutrition and has an important function in the metabolism of the human organism. It contains sodium which is one of the basic minerals of the body. Although the salt is necessary for our body, its excess intake leads to a number of negative health effects. The theoretical part of the thesis describes the physiological importance of sodium chloride and the negative effect of salt on the body. It also deals with legislative requirements for salt, the recommended daily doses and trends in the consumption of salt. Last but not least, inform about therapeutic nutrition and the prevention of diseases associated with excess salt intake. The aim of the work is to make an overview of the importance and use of salts and the negative health effects of excess salt in human nutrition and further laboratory verification of the salt content in selected food and compared the measured results with the data on the salt content listed on the packaging. Part of the work is sample menus with different content of salt. The assembled full-day menus using the program Nutriservis represent, how to eat properly and to follow the health recommendations for salt intake according to the WHO and at the same time contain examples of bad menus with overdue daily amount of salt. For...
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Comparision of methods for sulphide determination
Zlámalová, Magda ; Červený, Václav (referee) ; Nesměrák, Karel (advisor)
The aim of this work is determination of sulphides in a solution by suitable methods and it's subsequent comparison from a point of view to the precision, financial and time demands. Iodometric titration, argentometric titration, and potassium ferricyanide titration were chosen for the determination of sulphides in the solution. Anhydrous sodium sulphide and sodium sulphide hydrate were used as model samples. From the point of view to financial and time demands the most advantageous method was potassium ferricyanide titration and the least advantageous method was iodometric titration. The precision of used methods was dependent on type of used sample. Iodometry was the least precise determination of sulphides in the sample of anhydrous sodium sulphide; the precision of argentometry and potassium ferricyanide titration was comparable. Potassium ferricyanide titration was the most precise determination of sulphides in the sample of sodium sulfide hydrate; the least precise determination was argentometry.
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