I am planning on using synthetic copper sulphate solutions in order to determine the efficiency in the removal of copper ions by adsorption onto waste tea derived activated carbon.
Review of the allied literature revealed that the final concentrations of copper were found out by analyzing the samples in a UV spectroscope post adsorption.
I would like to know at what wavelength should I be measuring the absorbance and if there is any sort of concentration vs absorbance calibration curve
Here is a report, which should be helpful. It suggests to use 635 nm instead of the UV range. I did indirect photometric detection using CuSO4, but didn't keep its UV-vis spectrum.
I agree with dr.Hongzhu Liao,copper(II) ions in solution absorb light in the red region of the spectrum .CuSO4 is strongly absorb light with λ~ 600 nm.Also for more exact measurment, you can prepare a coloring copper chelating complex that absorbs light with visible range wavelengths.
The solution will be blue because the Cu ions strongly absorb “orange” photons of light (photons of light with λ ~ 600 nm)
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