Significance: Available potassium is a component in soil that can be absorbed and utilized by plants. It can promote the synthesis of starch and sugar, increase the content of oil and protein, and enhance the stress resistance of crops.

Determination principle: in weak alkaline condition, potassium ion combines with sodium tetraphenylborate to form white tetraphenylborate potassium precipitation, and the turbidity increases at 420nm. Turbidity is proportional to the concentration of potassium ion in a certain range.

Needed instruments and consumables: balance, normal temperature centrifuge, visible spectrophotometer/microplate, quartz cuvette / 96-well plate, shock meter.

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