Higher concentration of Ferrous (Fe+2) over Total Iron (Fe-2 and Fe-3) in soil using 1,10-Phenanthroline Colorimetric method?

I am determining Ferrous and Ferric iron species(Fe-2 and Fe-3) by Colorimetric method termed 1,10-Phenanthroline. I am getting the higher absorbance(0.100-0.500) for total iron standards and even...

13 July 2018 8,163 2 View