<prompt> Maximum potassium ions secretion is seen inSalivaGastric secretionsJejunal secretionsColonic secretions  <response>: Saliva Maximum potassium secretion are: 1 Colon rectum 85 meql 2 Saliva 25 meql 3 Others 5 meql Now if we look at the total secretions: Colonic secretions 200 mlday so Potassium 17 meqday Salivary secretions 2 litresday so potassium 50 meqday Others 5-6 litresday so potassium 25-30 meqday But since colon excretes body fluids and saliva secretes body fluids: Max daily potassium secretion is Saliva Max daily potassium excretion is Colon. Ref: guyton and hall textbook of medical physiology 12 edition page number: 400,401,402 