Acta Chim Slov. 2020 Mar;67(1):105-112.
Sorptive properties of Transcarpathian clinoptilolite towards trace amounts of Lu(III) were studied under dynamic conditions. It is shown that this lanthanide is sorbed from the weakly alkaline solution (?? 10) most efficiently. The sorption capacity of clinoptilolite under the optimal conditions is equal to 9.37 mg g-1. The distribution of various species of Lu(III) in aqueous solutions at various total concentration of the lanthanide in the pH range from 4 to 13 was calculated. The best desorbent of Lu(III) is the 1 mol L-1 solution of NaCl, preacidified with the solution of HCl to a value of ?? 4.0. This desorbent enables 95-100 % of Lu(III) removal. The method of Lu(III) trace amounts preconcentration from aqueous samples in a solid phase extraction mode with the further determination of this rare earth element via the spectrophotometric method using arsenazo III was developed. The linearity of the proposed method was observed in the range of 1-12 ng mL-1 with the detection limit of 0.4 ng mL-1.
在动态条件下研究了特兰西瓦尼亚斜发沸石对痕量镥(III)的吸附性能。结果表明，这种镧系元素最有效地从弱碱性溶液（pH 值为 10）中被吸附。在最佳条件下，斜发沸石的吸附容量等于 9.37mg/g。计算了在总镧系元素浓度为 4 至 13 的 pH 值范围内，各种镥(III)物种在水溶液中的分布。Lu(III)的最佳解吸剂是 1mol/L 的 NaCl 溶液，先用 HCl 溶液预先酸化至 pH 值为 4.0。该解吸剂可使 95-100%的 Lu(III)被去除。开发了一种在固相萃取模式下从水样中预浓缩痕量 Lu(III)的方法，然后通过分光光度法使用偶氮 III 进一步测定这种稀土元素。该方法在 1-12ng/mL 范围内具有线性关系，检出限为 0.4ng/mL。
