Multi-phase partitioning, ecological risk and fate of acidic pharmaceuticals in a wastewater receiving river: The role of colloids

► WWTP is the main source of pharmaceuticals to the receiving river in Shanghai. ► The colloids contribute 9-36% to the total pharmaceutical concentration in water. ► Truly dissolved diclofenac poses a potential risk to aquatic organisms. ► Clofibric acid and diclofenac tend to accumulate in water compartment.