Morrisville State CollegeDepartment of Agricultural Sciences

Instructional Soil Testing Lab

Potassium Test
1. Take 2.0 g of an air-dry soil sample and place in a 250 mL Erlenmeyer flask.
2. Add 20 mL of Ammonium Acetate solution and shake for 5 minutes on a reciprocating shaker at 180 oscilations per minute.
3. Filter the solution through a filter paper (number 42) into the filtration vials.
4. Take 5 mL of extract in a beaker, add 5 mL of ammonium acetate and then read K using the atomic absorption machine
5. The atomic absorption machine gives the concentration of K in parts per million (ppm) in the diluted solution.
6. The standard solutions used to calibrate the atomic absorption unit include 0, 5, and 20 ppm K. The standard solutions are prepared in an Ammonium Acetate matrix.

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Department web site designed and maintained by Dr. Walid Shayya.  Last modified: August 20, 2010.