Potassium Lab Report

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Potassium (K) Equipment which are required in measurement of potassium, flame photometer, centrifuge, capable of 3000rmp and mechanical shaker
A. Extraction
Weigh 10g of air dry soil into a 250ml flask then add 50ml 1 N NH4OAc solution. Shake it for 30 minutes at 200-300 rpm on a reciprocate shaker. Using a Whatman No.1 filter paper filter the suspension. Omit any soil particles and bring the extract up to 50 ml volume with 1 N NH4OAc solution.
B. Measurement
According to the instructions provided operate flame photometer. Draw a calibration curve and run a series of K standards. In the soil samples measure the K by taking emission readings on the flame photometer at 767mm wavelength. According to the calibration curve calculate K concentration.
Extractable K (ppm) = ppm K (from calibration curve) × V/Wt Extractable K (ppm) =meq/L K (from calibration curve) ×V/Wt×39.1
V = Total volume of the soil extract (ml)
Wt = Weight of air dry soil (g)
V= Total volume of the soil extract (mL)

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