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Estimation of Potassium
Potassium ions react with sodium tetraphenyl boron to produce a colloidal suspension, which is stabilized in a special matrix. The extent of turbidity is measured in terms of absorbance and is proportional to potassium concentration. Tetraphenyl Boron + K+ → White turbidity Reagents: 1. Boron reagent 2. Potassium standard (5 mmol/l) Pipette into two clean, dry test tubes labelled standard (S), and test (T) as follows:
Mix well, wait for 5 minutes at room temperature and read the absorbance of standard (S) and test (T) against distilled water at 620nm or with a red filter in a photoelectric colorimeter within 10 minutes. Calculations : Potassium (mmol/L) = O.D (T) ----------- x 5 O.D (S) Result: The potassium content of given serum = mmol / l or meq / l Clinical Significance:
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