Can we determine the concentration of extracted heavy metal by solvent extraction method and analyzing its extracted concentration before and after extraction by UV Visible spectrophotometer ?
Once again: UV-VIS spectrometry is neither very specific nor very sensitive for heavy metals.
Modern instruments are fast and have excellent sensitivity for detecting low concentrations of analytes. The analysis of heavy metals is important aspect of environmental monitoring. to use ICP-MS or AAS, which are very sensitive. Atomic absorption spectroscopy, is a technique for measuring the concentrations of metallic elements in different materials. The trace amounts of nickel and cadmium can be determined by spectrophotometric methods. These metals can be made to react with the chemical agents to form coloured complex or intermediate. The heavy metal ions such as Ni2+, Cu2+, Cr3+, Cr6+, Fe2+, and Fe3+ are successfully detected and the color change is visible from the naked eye. The minimum concentration detected is found to be 100 μM. The results are analyzed via UV–vis spectroscopy.
Yes. Before the development of ICP and AAS, scientists used dyes/chelates like Dithizone (mind you the expected concentration was in ppm not ppb).
This method uses chromogenic reagents to react with heavy metals, forming coloured complexes that can be measured spectrophotometrically. For example, 1,5-diphenylcarbazide (Cr(VI) ) and isobutyl ketone (MIBK) are used for extracting metals like copper, zinc, and cadmium.
Thank you all for your interest. Of course, we will consider your recommendations in our future work
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