Abstract: In the present study the activities of uranium were measured in water column, suspended particulate matter (SPM) and surface sediment along the Sungai Selangor, which is from river, estuary and near-shore. During high tide, the activities of uranium were found highly in the particulate phase (234U = 350.93±11.69 mBq g-1 and 238U = 243.55±9.33 mBq g-1), where the activity of uranium in particulate phases is slightly correlated with the amount of suspended particulate matters. A strong adsorption of uranium occurred onto the suspended particles matter was showed by the distribution coefficient (Kd) values as 2366 x 10-3 L g-1 and 1363 x 10-3 L g-1 for 234U and 238U, respectively.