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Determination of Significance：
Potassium maintains normal osmotic pressure and acid-base balance, participates in sugar and protein metabolism, and ensures normal neuromuscular function. If Blood potassium concentration is more than 5.5mmol/L, the disease is called high blood potassium, which increases sensitivity of nerve and muscle, decreases sensitivity of Myocardial stress. When serum potassium concentration exceeds 10mmol/L, ventricular fibrillation or even diastolic arrest occurs. When serum potassium is lower than 3.5mmol/l, hypokalemia can cause muscle weakness, muscle flaccid paralysis, increase of myocardial stress, tachycardia, arrhythmia and even arrest in systolic phase. Therefore, serum potassium is a commonly biochemical index.
Measurement Principle：
Potassium ion in serum is reacted with sodium tetraphenylboron to form potassium tetraphenylboron insoluble in water, and the turbidity is proportional to the concentration of potassium ion in a certain range. The content of serum potassium was determined by measuring its turbidity.
Self Provided：
Centrifuge, Transferpettor, Spectrophotometer/Microplate Reader, Micro Glass Cuvette/96 Well Flat-Bottom Plate, Distilled Water.
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