| 长江流域沿江镉异常源追踪与定量评估的研究框架 |
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| 引用本文： | 成杭新,杨忠芳,奚小环,赵传冬,吴新民,庄广民,刘英汉,陈国光.长江流域沿江镉异常源追踪与定量评估的研究框架[J].地学前缘,2005,12(1):261-272. |
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| 作者姓名： | 成杭新 杨忠芳 奚小环 赵传冬 吴新民 庄广民 刘英汉 陈国光 |
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| 作者单位： | 中国地质科学院,地球物理地球化学勘查研究所,河北,廊坊,065000;中国地质大学,地球科学与资源学院,北京,100083;中国地质调查局,北京,100026;江苏地质调查院,江苏,南京,210018;南京地质矿产研究所,江苏,南京,210018 |
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| 基金项目： | 国家自然科学基金;国土资源部国土资源大调查项目;科技部社会公益研究项目 |
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| 摘 要： | Cd属于积蓄性有毒元素,引起慢性中毒的潜伏期可达10~30 年之久。中国正在进行的多目标地球化学调查成果显示,长江流域存在全流域的Cd异常。对长江上、中、下游冲洪积物中Cd质量分数的初步研究,发现长江流域Cd异常以自然风化作用为主。针对长江流域Cd异常的特点,在统一技术规范的基础上采用枯、丰水期悬浮物测量技术、河漫滩/泛滥平原沉积物沉积柱分层采样技术,同位素测年技术来建立长江各支流Cd输入通量的时空变化模型和定量评估方法,估算长江各支流的Cd输入通量,使分散于沿江各省的区域地球化学评价置于同一平台,从而为全面研究长江流域Cd异常的形成机理创造条件。
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| 关 键 词： | Cd异常源追踪 输入通量 定量评价 研究框架 长江流域 |
| 文章编号： | 1005-2321(2005)01-0261-12 |
| 修稿时间： | 2004年10月10 |
A research framework for source tracking and quantitative assessment of the Cd anomalies along the Yangtze River Basin |
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| CHENG Hang-xin,YANG Zhong-fang,XI Xiao-huan,ZHAO Chuan-dong,WU Xin-min,ZHUANG Guang-min,LIU Ying-han,CHEN Guo-guang.A research framework for source tracking and quantitative assessment of the Cd anomalies along the Yangtze River Basin[J].Earth Science Frontiers,2005,12(1):261-272. |
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| Authors: | CHENG Hang-xin YANG Zhong-fang XI Xiao-huan ZHAO Chuan-dong WU Xin-min ZHUANG Guang-min LIU Ying-han CHEN Guo-guang |
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| Abstract: | Cadmium is an cumulative toxic element, which could result in chronic poisoning with an incubation period of as long as 10~30 years. The results of the currently implemented multi-purpose geochemical survey show that there are Cd anomalies spreading along the whole Yangtze River Basin. A preliminary study of the contents of Cd in alluvium on upper, middle and lower reaches of the Yangtze River reveals that these Cd anomalies are mainly caused by natural weathering. On the basis of a unified technical regulation and aiming at the features of the Cd anomalies, we proposed a spatial and temporal variation model for the quantitative assessment of the Cd input flux from tributaries.The model is established by applying the suspended particle matter survey during low-and high-water periods, the stratification sampling of sedimentation column on overbank sediments/floodplain sediments, and the isotopic dating. Thus, the Cd input flux from tributaries could be calculated under a unified regulation and the regional geochemical assessments for the provinces along the Yangtze River could be made under a unified standard, This should create the conditions for a comprehensive study of the mechanics of the Cd anomalies along the Yangtze River. |
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| Keywords: | source tracking of Cd anomaly input flux quantitative assessment research framework Yangtze River Basin |
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