Using Rice as Bio-Indicator for Heavy Metal Contamination,a Study in the Pb-Zn Mining and Smelting Area at Shuikoushan,Hunan Province,China
WANG Ling-mei1,2,WEI Chao-yang1,YANG Lin-sheng1 1.Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101 2.Graduate University of Chinese Academy of Sciences,Beijing 100049
Nonferrous metal mining and smelting activities have caused serious heavy metal contamination.It is highly desired to identify the sources of heavy metal contamination in order to control the heavy metal contamination effectively.The objective of this study was to explore the feasibility of using rice as bio-indicator for tracing heavy metal contamination sources in the area with intensive mining and smelting activities at Shuikoushan,Hunan province,China.According to the emission and transportation characteristics of heavy metals,as well as the local weather and topography conditions,three typical sampling sites were selected.Two of them were nearby the smelting and the tailing dams,respectively,while the other one was located at the transition zone between the former two.Thirty-three mature rice samples and their corresponding paddy soil samples were collected using the snaking sampling method.Arsenic,Pb,Cd,Zn,Cu and other 16 mineral elements were measured.The concentration of As,Pb,Cd,Zn and Cu in the soils and rice(rice roots,rice shoots,rice grain)were significant different between the three sampling sites,except Cd in the rice roots and rice grain.Multivariate statistical analysis showed a clear difference in elements correlation in the rice shoots between the three sampling sites,indicating heavy metal accumulation in rice had a significant effect on the uptake of mineral elements.The lower levels of As,Pb,Zn,Cu in soils,whereas higher concentrations and translocation factor values of these heavy metal elements in rice shoots and grains suggested that rice shoots could probably absorb extra heavy metals from atmospheric deposition.Based on the integrated analysis on spatial location,contamination sources as well as the accumulation and translocation factor values of the rice,the three sampling sites could be characterized as contaminated from wastewater-gas combined,atmospheric and tailing sources.The correlation of elements characterized in rice shoots using CA and PCA methods could be used to differentiate heavy metal contamination around the Pb-Zn mining and smelting areas at Shuikoushan.The results demonstrated rice growing in mining and smelting areas can be used to trace heavy metal contamination.
【Fund】： 国家“十一五”计划科技支撑项目(No.2006BAJ05A08);; 国家自然科学基金项目(No.20477045);; 中国科学院地理科学与资源研究所领域前沿项目(No.CXIOG-C04-02)
【CateGory Index】： X53
【CateGory Index】： X53