Detection of heavy metals with dithizone-cyclodextrin complex

Patricia Mputu Tshilombo, Kylie Alexander Aguirre, Isabella Marquardsen & Simone Dmitrievna Kozlovski

Studenteropgave: Fagmodulprojekt


Heavy metals are recognised toxic elements and their release into waters causes harmful effects on human health and the environment, since they are not biodegradable (Jaishankar et al, 2014). A way to detect heavy metals in organic solutions is with dithizone and its ability to form coloured solutions of dithizone-metal complexes (Fourmentin et al, 2018). This study investigates the detection of five different heavy metals (Cd, Co, Cu, Pb and Zn) in water solutions using dithizone as a detecting reagent and cyclodextrin to increase the solubility of dithizone in water by spectrophotometry. Two cyclodextrin (HP-β-cyclodextrin and β-cyclodextrin) were tested and compared with the solubility ability of acetone and chloroform Milli Q water mixtures. β-cyclodextrin-Milli Q water have been shown to be the best solvent for increasing the solubility of dithizone. The five heavy metals (Cd, Co, Cu, Pb and Zn) was tested in a dithizone-cyclodextrin aqueous solution. The results for the detection of heavy metals was mostly inconclusive, as the absorbance of most metals decreases with increasing concentrations of the metals. It was possible to detect zinc-dithizone-β-cyclodextrin complex by spectrophotometry. It can be concluded that colorimetric detection of heavy metal via dithizone-β-cyclodextrin is not a viable technique for detection of Cd, Co, Cu and Pb, but this technique can be utilized to detect Zn in a aqueous solution.

UddannelserKemi, (Bachelor/kandidatuddannelse) Bachelor
Udgivelsesdato18 dec. 2018
Antal sider78
VejledereJohn Mortensen