Speciation of heavy metals by modified BCR sequential extraction procedure in different depths of sediments from Sungai Buloh, Selangor, Malaysia

► A BCR sequential extraction procedure was applied for measurement of heavy metals in Sungai Buloh sediments in different depths. ► The amounts of CF and percentage of RAC was measured in this study too. ► Highest CF was obtained for Cd, Co, Pb and Zn in these samples. ► Zn at S3 and Cd at S3-S7 showed a high risk for the sediment samples. There were no elements of very high risk conditions in the selected samples.