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Determination of fluoride in toothpaste using SIA system
Barvínková, Zuzana ; Sklenářová, Hana (advisor) ; Šatínský, Dalibor (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Analytical Chemistry Candidate: Mgr. Zuzana Barvínková Consultant: Doc. PharmDr. Hana Sklenářová, Ph.D. Title of Thesis: Determination of fluoride in toothpaste using SIA system Determination of fluorides was tested in the toothpastes using the SIA system. For determination of fluorides reaction of aluminium ions with aluminon that forms a red complex was used. After addition of a fluoride solution, aluminium ions were released from this complex. Spectrophotometry was used for the detection. The calibration range for sodium fluoride was linear over the range of 3x10-3 to 1x10-2 mol.l-1 . The repeatabitily of the measurement was tested for blank solution (water) and for the solutions of sodium fluoride 5x10-3 mol.l-1 and 6.25x10-3 mol.l-1 . The repeatability was in the range of 1.19 - 3.70 %, that was found acceptable. Then, potencially interfering ions were identified, which may effect determination of fluorides. Following the composition of usual toothpastes interferents could be: Cl- , Br- , I- , Ca2+ , PO4 3- , Zn2+ , CO3 2- , Al3+ , CH3COO- , Sn2+ , tartrate anion, citrate anion, lauryl sulphate anion, sorbitol and methylparaben. Among interfering ions, which influence the determination in low concentration, belong: Ca2+ ,...
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Corporate social responsibility in the construction industry
Barvínková, Zuzana
Barvínková, Z. Corporate Social Responsibility in construction industry. Diploma thesis. Brno: Mendel University, 2014. This thesis deals with the issue of corporate social responsibility. Corporate social responsibility is the responsibility of companies for their impacts on society and is based on voluntary commitment. The thesis analyzes current state of CSR in small and medium-sized companies in construction industry of Czech Republic as an industry which has great impacts on environment, energy resources and also national economy as one of the biggest employer and propose recommendations for improvement of CSR and hereby improvement of competitiveness of small and medium-sized businesses in construction industry. Thesis is built on qualitative and quantitative research within four member countries, Czech Republic, Netherlands, Sweden and United Kingdom.
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