【摘要】 采用液-液萃取法和ICP-MS测试技术对巢湖的溶解态稀土元素进行了分析。结果表明,巢湖的溶解态稀土的含量与世界淡水相当,丰水期的样品含量高于其他季节。pH值和悬浮物、胶体是控制巢湖水体中溶解态稀土含量的主要因素。巢湖的溶解态稀土的分布模式以平坦型为主,少数呈现重稀土富集。丰水期和枯水期的溶解态稀土的(La/Yb)N值从西半湖区到东半湖区呈现有规律性的逐渐增大,并且丰水期的(La/Yb)N值低于枯水期。在富营养化湖泊中,胶体和水生生物可能是造成这一现象的主要原因。更多还原

【Abstract】 The dissolved rare earth elements(REEs)in the aquatic environment of Lake Chaohu were determined by inductively coupled plasma mass spectrometry(ICP-MS)after solvent extraction and back-extraction.The results show that the concentrations of dissolved REEs in Lake Chaohu are similar to those in freshwater of the world.Furthermore, these concentrations of dissolved REEs during high-water period are clearly higher than those during low-water season.The concentrations of dissolved REEs are mainly controlled by pH and the concentration of suspended and colloidal particles.The dissolved REEs in most lake waters show flat NASC-normalized REE patterns, but a few samples showing heavy REE enrichment relative to NASC.The values of(La/Yb)N in high-water period and low-water season increase from west to east, and they in high-water period are larger than those in low-water season.These phenomena might be mainly resulted from colloidal particles and hydrophytes in the eutrophication lake.更多还原