Potassium Lab Report

Potassium (K) Equipment which are required in measurement of potassium, flame photometer, centrifuge, capable of 3000rmp and mechanical shaker

Procedure

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.

Calculation

Extractable K (ppm) = ppm K (from calibration curve) × V/Wt Extractable K (ppm) =meq/L K (from calibration curve) ×V/Wt×39.1

Where:

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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