Why am I getting increased active carbon concentrations when I reduce the amount of soil from 5g to 2.5g instead of decreased concentrations?

I am running Active Carbon using 0.2M KMnO4 solution with 2.5g of soil, shaking by hand for 2 mins and letting stand for 10 mins. I am using a Cary 60 spec. When I use the formula by Weil et al....

15 January 2014 9,001 3 View