[Fmeub]

Dear reader,

We had to do an experiment to determine the concentration of chromium in a water sample using stripping voltammetry. Unfortunately it seems that there was chromium or zinc contamination from somewhere else in the cell.

I was not responsible for setting up the instruments or taking the water sample or any of the preparations.

I read in a book that chromium(III)oxide can be used to scrub the nitrogen gas with which one purges the cell initially to get rid of the oxygen.

What I want to know, is whether minute quantities of this chromium(III)oxide could have landed in the cell and caused the contamination?