Urine. Turbidimetric method (Tetraphenilborate). Endpoint

Potassium ions react with Sodium Tetraphenylborate giving rise to a stable turbidity whose optical  absorbance, which can be measured photometrically at 578 nm, is proportional to the concentration of potassium in the sample under examination.

FIU_POTASSIUM LS MONO_ENG REV.03-2019