Anugrah Ricky Wijaya, Aaron Kenkichi Ouchi, Kentaro Tanaka, Michael Dustin Cohen, Sittipun Sirirattanachai, Ryuichi Shinjo, Shigeru Ohde
In order to elucidate the sources of metals in urbanized areas, heavy metal contents and Pb isotope ratios were determined in the Chao Phraya River sediments. The sediment samples were leached using 1% HNO3 and metal concentrations (Cd, Cu, Cr, Pb, and Zn) and Pb isotopic ratios (208Pb/206Pb and 207Pb/206Pb) in the solutions were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The highest ranking of potential pollutant evaluations of Cd, Cu, Cr, Pb, and Zn contents was found from samples that were located near to the center of Bangkok. Pb isotope ratios (208Pb/206Pb: 2.075-2.113 and 207Pb/206Pb: 0.834-0.868) in the Chao Phraya River sediments near to the center of Bangkok agreed well to those in the Bangkok road side dust and pond sediments suggesting that river sediments may be contributed from road-side dust and pond sediments. Moreover, Pb isotope ratios confirmed that the polluted sediments were contributed as Pb products of fly ashes (municipal waste combustors) in Bangkok (208Pb/206Pb: 2.100-2.120 and 207Pb/206Pb: 0.867-0.870). © 2012 Elsevier B.V..
Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan; Department of Chemistry, State University of Malang (UM), Jl. Semarang 5 Malang, 65145, Indonesia; Department of Aquatic Science, Burapha University, Chonburi 20131, Thailand
