论文部分内容阅读
以中国第三大淡水湖泊太湖为研究对象,通过液-液萃取、连续提取法以及ICP-MS测试技术对太湖水体中溶解态和悬浮物中的稀土进行分析。结果表明:太湖水体中溶解态稀土含量较低,由于湖水的混合作用整个西太湖水体中稀土元素含量比较相近,东太湖水体由于自净化作用含量低于西太湖。由于颗粒物表层胶体的吸附作用,溶解态稀土呈现出重稀土富集现象。悬浮物AEC态可能由于富含铁的有机胶体、磷酸根络合和富含铁锰次生矿物相等的作用,呈现出中稀土富集。水体中溶解态稀土几乎全部是以有机络合物的形式存在;悬浮物是稀土元素的主要载体,且残渣态>AEC态>溶解态。
Taking Taihu Lake, the third largest freshwater lake in China, as the research object, the rare earths in dissolved and suspended matter in Taihu Lake were analyzed by liquid-liquid extraction, continuous extraction and ICP-MS. The results show that the content of dissolved rare earth in Taihu Lake water body is relatively low. Because of the mixed effect of the lake water, the content of rare earth elements in the whole Xi Taihu Lake water body is relatively similar. The content of water in the Dongtai Lake is lower than that of the West Taihu Lake due to self-purification. Due to the adsorption of the surface colloidal particles, dissolved rare earth shows heavy rare earth enrichment phenomenon. The AEC state of suspended solids may be due to the equal effect of iron-rich organic colloids, phosphate complexes and ferric-manganese-rich secondary minerals, showing a medium rare earth enrichment. Almost all dissolved rare earths exist in the form of organic complexes; suspended solids are the main carriers of rare earth elements, and the residual state> AEC state> dissolved state.