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| Heavy metal content characteristics and assessment of rice grain from Qianguo Irrigation Area, Jilin Province |
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Abstract A total of 23 rice grain samples were collected from paddy fields with different irrigation histories in Qianguo Irrigation Area, which is located in the downstream of the Second Songhua River basin, in the fall of 2008. Concentrations of Hg, Cd, Cu, Zn, Ni and Cr in rice flesh and hulls were determined and risks were assessed based on relative national standards of China. The concentrations of Hg in rice flesh increased with irrigation histories of the paddy fields while no significant relationships were found between the other metal elements and irrigation histories. The heavy metal concentrations in rice flesh and hulls from paddy fields with different irrigation histories took similar orders. The concentrations of Zn in rice flesh were higher than in rice hulls while the concentrations of Cd, Cu, Cr, Hg, and Ni were opposite. Using the monomial pollution index method, only one rice flesh sample was detected with higher Ni than the national standard. The composite pollution indexes of rice flesh ranged from 0.33 to 0.91, with the average of 0.51, which was considered to be in the level of security. The results show that the historical pollution of the Second Songhua River resulted in the bioaccumulation of Hg in rice flesh, but it has not posed ecological risks. Consequently, after the Hadashan Reservoir depending on the Second Songhua River as water source is built, the irrigation will pose low ecological risks to the food security in this area.
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Received: 09 May 2010
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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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