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. (2003) I change the weight from 5g to 2.5g and my active carbon values jump past my limit of 648 from the National Soil Lab standard. Does anyone have any suggestion on what I can do to correct this? Alter shaking time? When I use the 5 g as called for, my reading still comes out above the standard and the procedure says to rerun with the 2.5g. I am following a procedure that says to decrease the amount from 5g to 2.5g if I hae zero absorbance.
Thank you both very much for the information. I found the paper that Mr. Zeraatpishe listed. Mr. Rovira, do you have more information you could give me on the authors that you listed?
The 0.2M KMnO4 is fixed at 2mL with 18mL DI water. This is for both the 2.5g and the 5g of soil.
I did find the citations for Blair and Loginow in the Tirol-Padre and Ladha, 2004 paper.
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