Measuring significance: blood sodium plays an important role in maintaining normal extracellular fluid capacity and osmotic pressure, and the acid-base balance of body fluids.

Measurement principle: Sodium in serum is formed into a pellet in a weak alkaline solution, and the precipitate is proportional to the sodium concentration, and the sodium content in serum can be determined according to its turbidity.

Need instruments, supplies: centrifuge, water bath, adjustable pipette, visible spectrophotometer / enzyme label, trace quantum-based cuvette / 96-well plate, deionized water and absolute ethanol.

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