Evaluation of the source, distribution and risk of metal contaminated stream sediment

The research was conducted to determine the cause, dispersal, and risk assessment of metal-contaminated sediment. The sediment was collected from the Madna stream. It was transported to the laboratory, air-dried, ground with a mortar and pestle, and sieved. The sediment was digested with 10 ml of HNO3 and 30 ml of HCl and heated on a hot plate at 100 °C for about 2 hours. The 1 ml solution was diluted to about 50 ml and centrifuged at 1600 revolutions per minute for 10 minutes. The clear solution was analyzed by an atomic absorption spectrophotometer (AAS). The distribution of the average concentration showed that Cd