Hello,
I am trying to use the EPA methods to analyze for Cr(VI) in soil using a UV-Vis. I have been having issues wtih color interferences even after filtering, increasing my absorbance levels. I believe it's mostly organic material causing the problem. I have not seen this in plain sand samples.
Does anyone know of a way to correct for this problem? I have tried using a turbidity correction, but it didn't work.
Thanks!