All chemicals were analytical grade reagents and Milli-Q (Elix UV5 and MilliQ, Millipore, USA) water was used for solution preparation. The Teflon vessel and polypropylene containers were cleaned, soaked in 5% HNO3 for more than 24 h, then rinsed with Milli-Q water and dried. For metal analysis, 20 mL water sample and 0.5 g of sediment sample was treated with 5 mL 69% HNO3 acid and 2 mL 30% H2O2 in a closed Teflon vessel and was digested in a Microwave Digestion System. The digested solution was then filtered by using syringe filter (DISMIC® – 25HP PTFE, pore
size = 0.45 m) Toyo Roshi Kaisha, Ltd., Japan and stored in 50 mL polypropylene tubes (Nalgene, New York). Afterwards, the vessels were cleaned by Milli-Q water and dried with air.