巢湖、龙感湖水体中稀土元素的无机形态研究
Inorganic Speciation of Rare Earth Elements in Chaohu Lake and Longganhu Lake, East China
查看参考文献15篇
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文摘
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运用MINTEQ化学平衡软件对巢湖、龙感湖中溶解态稀土的形态进行模拟。模拟结果表明，在巢湖和龙感湖中Ln（CO3）^2-，LnCO3^＋是溶解态稀土的最主要的存在形式，当8pH〉7．19时，REE主要以LnCO3^＋形式存在，当pH〉8时，REE主要以Ln（CO3）2^-形式存在，并且∑Ln（CO3）n^3-2n（n=1和2）形态的稀土基本上占溶解态稀土总含量的93％以上。Ln^3＋在巢湖和龙感湖水体中平均丰度为5．03％，Ln^3＋的丰度和pH值成反相关关系。LnPO4在湖水中平均丰度为1．61％，但这种形式的稀土在巢湖和龙感湖中非常重要。巢湖和龙感湖中LREE的LnPO4均处于过饱和状态，甚至巢湖西半湖区丰水期HREE的LnPO4的也都处于过饱和状态，PO4^3＋对稀土的存在有很强的限制作用。InSO4，LnF^2＋，LnOH^2＋，LnCl^3＋等形态的各元素平均丰度均小于1％，在富营养化的淡水中通常可以忽略不计。 |
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其他语种文摘
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Inorganic speciation of dissolved rare earth elements （REEs） were calculated for Chaohu and Longganhu Laks by using the program MINTEQ 2.30. The result shows that REE-Carbonate complexes,which account for more than 93 % of total REE are the dominate and typically species in solution. Moreover, carbonator complexes （LnCO3 ~ ） were predicted to be the dominant species when pH between 7.2 and 8.0 and bicarbonate complexes （ Ln（CO3）2^-） were predicted to be the dominant species when pH 〉 8.0. The free ion specie （i.e., Ln^3＋ ） increases in these waters with pH decreasing and accounts for about 5.03%. The percentage of REE-phosphate complexes account for 1.61% of the dissolved REEs. REE-phosphate for light REEs complexes are supersaturated in Lake Chaohu and Longganhu. Furthermore, LnPO4 for Heavy REEs are supersaturated in west of Lake Chaohu in high water period. PO4^3- is responsible for limiting the dissolved REEs concentrations. REE-sulfate, REE- chloride, REE-fluoride and REE-hydroxide complexes, are negligible and generally account for less than 1% of the total dissolved REEs. |
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来源
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中国稀土学报
,2006,24(1):110-115 【核心库】
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关键词
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MINTEQ
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形态
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CO3^2-
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PO4^3-
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稀土
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4343 |
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学科
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地质学;环境科学基础理论 |
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基金
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:2252861
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