Surgery Small & Large Intestine a21fcb9e Highest concentration of potassium is seen in: A Jejunum B Ileum C Duodenal D Sigmoid colon High-Yield Explanation Ans. (d) Sigmoid colonRef: Schwartz 10/e p69* Highest concentration of potassium seen in Colon (30mEq/L).* Highest absorption of potassium occurs in colon