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首页> 外文期刊>Geochemical Journal >Rare earth element partitioning between Fe oxyhydroxide precipitates and aqueous NaCl solutions doped with NaHCO3: Determinations of rare earth element complexation constants with carbonate ions
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Rare earth element partitioning between Fe oxyhydroxide precipitates and aqueous NaCl solutions doped with NaHCO3: Determinations of rare earth element complexation constants with carbonate ions

机译：羟基氧化铁沉淀和NaHCO3掺杂的NaCl水溶液之间的稀土元素分配：稀土元素与碳酸根离子的络合常数的测定

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The distribution coefficients of rare earth elements (REEs; all lanthanides except Pm, Y and Sc) between Fe oxyhydroxide precipitates and 0.5 M NaCl solutions with NaHCO3 (0.0 similar to 12.0 mM) at 25 degreesC and 1 bar have been determined. This experimental system is a simple model for REE partitioning between deep-sea ferromanganese nodules and seawater. The distribution coefficients; K-d(REE: precipitate/solution), show systematic variations with increasing NaHCO3 concentrations. We have determined REE(III)-carbonate complexation constants from the experimental distribution coefficients as a function of NaHCO3 concentration and pH. The REE(III)-carbonate complexation constants show almost the same series variations as reported values obtained by the solvent-extraction method, although our results by the precipitation method are rather higher by 1.0 similar to1.5 in log unit than the literature data at zero ionic strength. [References: 38]
机译：确定了氢氧化羟基铁沉淀物和0.5M NaCl溶液与NaHCO3（0.0近似于12.0 mM）在25℃和1 bar下的稀土元素（REE; Pm，Y和Sc以外的所有镧系元素）的分布系数。该实验系统是在深海铁锰结核和海水之间进行稀土元素分配的简单模型。分布系数; K-d（REE：沉淀物/溶液）随着NaHCO3浓度的增加显示出系统的变化。我们已经根据实验分布系数确定了REE（III）-碳酸盐络合常数，该常数是NaHCO3浓度和pH的函数。 REE（III）-碳酸盐络合常数显示出与溶剂萃取法报道的值几乎相同的系列变化，尽管我们的沉淀法结果比对数下的log值高出1.0，与log值相近，接近1.5。零离子强度。 [参考：38]

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