I have synthesized a material to adsorb the toxic metal ions from water.I have done the lead detection by UV spectrophotometer by compexing it with EDTA (as shown below in the UV plots). It is observed that after passing through the material the peak corresponding to Pb-EDTA complex disappears but an extra peak is observed. I am attaching the plots for your assistance. I am unable to detect the element for this extra peak. Is there any other electrochemical method (such as CV analysis)or any other methods which can be carried out to detect the toxic metal ions before and after adsorption through my material.
You can use Inductively coupled plasma mass spectrometry (ICP-MS), which is capable of detecting metals at concentrations of a part per quadrillion, ppq in acid condition
But for the XPS analysis we should have the knowledge of the metal present. But I wanted to detect the extra peak as I mentioned in the attachment file
I assume that you inserted the solid absorbing material into the Pb-EDTA solution.The plateau around 250nm looks like the background saturation due to the vanishing of Pb-EDTA peak. It might depend on the blank solution you used. If your blank solution is plain water you might see this plateau. You can redo the experiment with either Pb or EDTA as blank solutions and see. Also, monitor the solution pH.
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