| 摘要: |
| 用等离子体原子发射光谱法(ICP-AES) 分析了珠江马口站和三水站1997—1998 年度3 个典型水文时段径流悬移质中部分金属元素的含量, 同时用元素分析仪测定了其中的有机碳、氮的含量。结果表明, 在不同性质的水文动力条件下, 流域侵蚀产出的河流悬移质的化学组成发生了变化, 这主要缘于有机质在悬移质中所占质量分数的差别。汛期增强的水文动力主要表现为对流域土壤矿物的优先侵蚀, 虽然有机质的总侵蚀量也同时增加, 但在悬移质中的质量分数却相对减少; 而在枯水期较弱的水文动力条件下, 河流悬移质中有机质的质量分数增加。悬移质中的有机质对液相中的部分重金属元素产生较矿物更大的吸附作用。 |
| 关键词: 水文过程, 河流悬移质, 吸附, 金属元素, 有机质 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目, 40143012、49901002 号; 广东省自然科学基金资助项目, 984131 号; 中山大学分析测试基金资助项目 |
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TAO Zhen1, GAO Quan-Zhou1, XIE Mei-Qi2, CUI Kun-Yan2
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1.Department of Geography , Zhongshan University;2.The Instrumentation Analysis and Research Center, Zhongshan University
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| Abstract: |
| The chemical composition of riverine sediment is the integration of the weathering crust minerals, soil organic matter and erosion dynamic within a specific drainage, which has been increasingly affected by human activities. Some metal elements of the riverine suspended sediments in the Zhujiang River were analyzed with the method of ICPAES at Makou and Sanshui hydrographic stations, which are located at the lower reaches of the Xijiang river and the Beijiang river, respectively, and in three different hydrological periods from 1997 to 1998. Organic carbon and nitrogen were also analyzed with an element analyser. The analytical results demonstrate that the chemical element composition of the riverine suspended sediments changed significantly between the different hydrological periods, which was caused mainly by the variations of the mass fraction of organic matter in the suspended sediments. Intense erosion during the flood period makes the mass fraction of minerals become much larger than that of organic matter. However, during the lower water level, the week dynamic condition favors erosion of organic matter, which may adsorb some metal elements from surrounding water onto the surface of the riverine sediments. |
| Key words: Hydrological processes, Riverine suspended sediment, Adsorption, Metal element, Organic matter |
