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Abstract Forty-six surface sediment samples were collected from the Bangkok Bay (Upper/Northern Gulf of Thailand) and adjacent river-mouths (Mae Klong River, Tha Chin River, Chao Phraya River, and Bang Pakong River) in 2010. The geochemical characteristics of heavy metals (Cd, Co, Cu, Pb and Zn) were studied using Al as a reference element to normalize the grain-size effect. The biological availability was assessed based on heavy metal concentrations in acid-soluble and residual fractions after the bulk sediment samples were pretreated with 1mol/L HCl. The results showed that the concentrations of heavy metals in sediments of the river-mouths were higher than that of the Bangkok Bay. The concentrations of heavy metals increased in a seaward direction from north to south except Cd and geo-accumulation index indicates that Cd and Pb were significantly enriched in the sediments. Higher concentrations of Cd and Pb in the soluble fractions showed strong bioavailability which may easily cause secondary pollution.
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Received: 21 April 2015
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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