I have a mixture of wastewater + hydrogen peroxide+ iron(II) sulfate, and I want to measure the concentration of iron in the solution.
Dear Kamal
see these
http://ma.ecsdl.org/content/MA2006-01/30/1048.full.pdf
http://ma.ecsdl.org/content/MA2006-01/30/1048.full.pdf
Phenathroline method is best. It is colorimeteric method and very specific. I have tested more than 200 samples for iron determination. Follow APHA book.
thank you all for your answers. I read about the Phenathroline method, but it says the phosphate will be interfering?? I do not how much difference it is gonna make. I have phosphates in my samples too
What about visible-light spectroscopy on the specific color of (greenish) Fe(II) - colorimetry is simple. You can make calibrations with solutions of accurately prepared concentrations.
I have a feeling, around normal pH and concentration range (except if the iron(II) is in complex) iron(II) does not exist in the presence of H2O2. What you can measure, that is the excess of iron(II) after reacting of H2O2, or the excess of H2O2 after reacting of Fe(II). These can be done by permanganate titration in the presence of sulphuric acid, but iron(II) can be oxidized easily (depending on pH) by the air as well. Furthermore, due to this, back-titration could be used e.g. with permanganate, but the permanganate can be react with the other components of the water as well. The phenanthroline method seems to be suitable in your system.
Ion Chromatography will be the better option:
Refer following link for PDF (Page 15)
http://tools.thermofisher.com/content/sfs/manuals/4342-31188-06_CS5A_V17.pdf
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