Experimental study on distribution coefficients of REE between Fe-Mn oxyhydroxides and aqueous NaCl solutions

Fe-Mn羟基氧化物与NaCl水溶液之间REE分配系数的实验研究

• 批准号: 06453007
• 负责人: KAWABE Iwao
• 金额: $ 4.67万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06453007/
• 关键词: element partition; rare earths; Fe-Mn oxyhydroxides; tetrad effect; 希土類元素分配

Distribution coefficients of REE,Y and Sc between Fe-Mn oxyhydroxides and aqueous NaCl solutions are the key to understanding the fractionations of Y and Sc from REE in natural aquatic systems. The variations of the distribution coefficients in the lanthanide series as well as their tetrad effects reflect their relative differences in bondings of REE^<3+> ions between the REE (III) species in the pair of phases. We have established the experimental method to determine the distribution coefficients of REE,Y and Sc between Fe-Mn oxyhydroxides and aqueous NaCl solutions at normal temperature conditions by using ICP-AES techique. Our results indicate that observed fractionations of Y and Sc from REE in natural aquatic systems are due to partitioning them between natural waters adn Fe-Mn oxyhydroixe precipitates in them. The tetrad effect variations of D (REE) strongly suggest that Racah parameters of REE (III) in Fe-Mn oxyhydroixe precipitates are smaller than those of REE^<3+>^+(aq). Our results of D (REE) indicate that the coordination states of Tm, Yb, and Lu ions in Fe-Mn oxyhydroixe precipitates significantly different from those of the other REE.

稀土元素、Y和Sc在Fe-MnO_2O_3-NaC l水溶液中的分配系数是了解天然水生体系中Y和Sc从REE中分馏的关键。稀土元素系列中分配系数的变化及其四元效应反映了稀土离子在相对中稀土(III)物种间键合的相对差异。建立了在常温条件下，用电感耦合等离子体原子发射光谱技术测定稀土元素在铁锰氧化物和氯化钠水溶液中的分配系数的实验方法。我们的结果表明，在天然水系中观察到的稀土元素中Y和Sc的分馏是由于它们在天然水体和其中的Fe-Mn氧化物沉淀之间的分配。D(REE)的四元效应变化强烈地表明，Fe-Mn水合氧化物中REE(III)的racah参数小于REE^&lt；3+&gt；^+(Aq)。我们的D(REE)结果表明，Tm、Yb和Lu离子在Fe-Mn水合氧化物中的配位状态明显不同于其他稀土元素。

项目成果

Kawabe,I.: "Convex tetrad effect variations in REE abundances of "North American Shale Composite" and "Post-Archcau Australian averoge shale"" Geochem.Jour.(in press).

Kawabe,I.：““北美页岩复合材料”和“后阿克考澳大利亚平均页岩”稀土元素丰度的凸四分体效应变化”Geochem.Jour.（出版中）。

Kawabe,I.: "Convex tetrad effect variations in REE abundances of“North American shule composite"and“Post-Archean Australian average" Geochem.J.(in press).

Kawabe, I.：“北美疏勒复合物”和“后太古代澳大利亚平均”稀土元素丰度的凸四分体效应变化 Geochem J.（正在出版）。

Kawabe.I: "Tetrad effects and fine structures of REE abundance patterns of granitic and rhyolitic Rocks:ICP-AES determinations of REE and Y in eight GSJ reterene rocks" Geochemical Journal. (印刷中).

Kawabe.I：“花岗岩和流纹岩的 REE 丰度模式的四分体效应和精细结构：八个 GSJ reterene 岩石中 REE 和 Y 的 ICP-AES 测定”《地球化学杂志》（正在出版）。

Kawabe, I.: "Tetrad effects and fine structures of REE abundance patterns of granitic and rhyolitic rocks : ICP-AES determinations of REE adn Y in eight GSJ reference rocks." Geochem.J.29. 213-230 (1995)

Kawabe, I.：“花岗岩和流纹岩的 REE 丰度模式的四分体效应和精细结构：八个 GSJ 参考岩石中 REE 和 Y 的 ICP-AES 测定。”

Kawabe,I.: "Tetrad effects and fine structares of REE abundance patterns of granitic and rhyolitic rocks : ICP-AES determinations of REE" Geochem.J.29. 213-230 (1995)

Kawabe,I.：“花岗岩和流纹岩的稀土元素丰度模式的四分体效应和精细结构：稀土元素的 ICP-AES 测定”Geochem.J.29。