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Abstract Chemical speciation of metals and their environmental behaviors are of great importance for the emergency responses and damage assessments of emergent environmental incidents caused by industrial releases. Based on the Longjiang river cadmium pollution accident occurred in year 2012 in Guangxi, China, the dissolved Cd speciation in the river for 3 different scenarios were calculated using Visual Minteq 3.1. It was showed that Cd2+ was the dominant Cd specie with a low concentration (0.005mg/L), and it was strongly influenced by DOC content at the background situation. If there were no immediate responding activities in the river after the release of Cd, Cd2+ would cover more than 75% of the total dissolved Cd with a high concentration (0.4mg/L) because of the little buffer ability of the natural aquatic system, which would present serious ecological emergency toxicities. Adding polymeric aluminum and alkali to the river in a proper way could reduce Cd content in the river efficiently and the ratio of Cd2+ also reduced rapidly when pH raise to 9.0 or higher. Cd2+ was sensitive mostly to pH, and secondly DOC, and was not sensitive to temperature. It was suggested that we should pay attention to the re-release of Cd in inorganic polymer flocculation bodies and the influences of pH and DOC.
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Received: 16 February 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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