Chemistry IA: The effect of EDTA in different drinks on chelating copper…
Chemistry IA: The effect of EDTA in different drinks on chelating copper ion in contaminated water
rationale: water pollution is a serious environmental problem as it may decrease biodiversity
common harmful substances in contaminated water: fluoride, chloride, lead, mercury, PCBs, arsenic, perchlorate, dioxins, DDC, HCB, dacthal, MtBE
A chelate is an organic compound formed when a polydentate ligand bonds to a central metal atom.
ions of heavy metal can be removed by forming chelate with polydentate ligand
EDTA is one of the common chelating agent
EDTA is widely used in many preservative
processed food may contain different amount of EDTA which can help reduce heavy metal in contaminated water
Most well known toxic heavy metal: cadmium, mercury, lead, arsenic(all transition metal-->use copper to simulate effect)
simulate contaminated water by dissolving copper compound to create arsenic ions in water
prepare different processed food or drinks(in liquid form)
add certain amount of EDTA sources into the cuvette, and put the cuvette into the colorimeter as fast as possible
put the "contaminated water" into a cuvette, remember to calibrate it before the experiment start.
use SPARKvue to collect data and plot graph
More EDTA will lead to a faster chelation of copper ions
rate of reaction
different types of EDTA?(eg. EDTA disodium salt, EDTA tetrasodium salt)
calcium disodium EDTA: canned carbonated soft drinks
Independent variables: types of EDTA or types of drinks?
dependent variables: reaction rate of chelating copper ions