Extraction Behavior of Trace Amounts of Precious Metals with Crown Ethers

冠醚萃取微量贵金属的行为

• 批准号: 10640586
• 负责人: HONJO Takaharu
• 金额: $ 2.05万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640586/
• 关键词: Crown ether; Precious metal ion; Solvent extraction; Separation analysis; 分離分析

The effect of various factors (solvent, reagent concentration, crown ether, hydrochloric acid, stripping reagent, shaking time etc.) on the extraction and back-extraction of palladium (II) in hydrochloric acid (1〜10 mol/L) and thiocyanate media with dicyclohexyl-18-crown-6 (DC18C6) in organic solvent has been investigated in detail.On the basis of the results, the recommended procedure is proposed as follows : an aliquot(10 mL) of a sample solution containing palladium(10 μ g/mL) and potassium thiocyanate (0.05 mol/L) in 1 mol/L hydrochloric acid was placed into a 30 mL glass-stoppered centrifuge tube. A 10 mL of chloroform solution containing 0.05 mol/L DC18C6 was added to the centrifuge tube, and the mixtures were shaken on a shaking machine for 5 min. The two phases were separated by centrifugation at 2000 rpm for 5 min, and then taken by pipetting into another tube. The organic phase (10 mL) containing the extracted palladium was shaken with 10 mL of 0.1 M ammonia buffer (0.1 mol/L NH4Cl: 0.1 mol/L NH3 = 1:1) solution for 5 min. The amount of palladium stripped from the organic phase was determined by flame AAS. Palladium in hydrochloric acid and thiocyanate media has been extracted quantitatively in chloroform with DC18C6 as an ion-association species of [K・DC18CィイD26ィエD2ィイD1+ィエD1]ィイD22ィエD2[Pd(SCN)ィイD24ィエD2ィイD12-ィエD1]. The content of palladium in chloroplatinic acid of guaranteed reagent grade after its separation by DC18C6 extraction was found to be 31.66 μ g/g.

考察了各种因素（溶剂、试剂浓度、冠醚、盐酸、反萃剂、振荡时间等）对反萃效果的影响。钯（II）在盐酸中的萃取和反萃取在有机溶剂中，以二环己基-18-冠-6（DC_（18）C_6）为显色剂，在硫氰酸盐介质中进行了显色反应的研究。将含钯（10 μ g/mL）和硫氰酸钾（0.05 mol/L）的1 mol/L盐酸样品溶液的等分试样（10 mL）置于30 mL玻璃塞离心管中。向离心管中加入10 mL含0.05 mol/L DC 18 C6的氯仿溶液，在振荡器上振摇5 min，以2000 rpm离心5 min分离两相，然后移液至另一管中。将含有萃取钯的有机相（10 mL）与10 mL 0.1 M氨缓冲液（0.1 mol/L NH 4Cl：0.1 mol/L NH3 = 1：1）溶液一起振摇5 min。在盐酸和硫氰酸盐介质中，以[K·DC_（18）C_（26）D_（2经DC_（18）C_6萃取分离后，保证试剂级氯铂酸中钯含量为31.66 μ g/g。

项目成果

K. Z. Hossain and T. Honjo: "Extraction Behavior of Platinum (II) in Chloroform with Crown Ether from Acidic Media"Proceedings of ISEC'99, (ISEC'99-Solvent Extraction for the 21ィイD1stィエD1 Century), Society for Chemical Industry, London. (in press). (1999)

K. Z. Hossain 和 T. Honjo：“从酸性介质中用冠醚在氯仿中萃取铂 (II) 的行为”，ISEC99 论文集（ISEC99-21 世纪溶剂萃取），伦敦化学工业学会。 （正在出版）。

K. Z. Hossain and T. Honjo: "Separation of Trace Amounts of Palladium (II) with Crown Ether from Hydrochloric Acid and Potassium Thiocyanate Media"Fresenius J Anal Chem. (in press). (2000)

K. Z. Hossain 和 T. Honjo：“用冠醚从盐酸和硫氰酸钾介质中分离痕量钯 (II)”Fresenius J Anal Chem。

K. Z. Hossain and T. Honjo: "Separation of Trace Amounts of Palladium(II) with Crown Ether from Hydrochloric Acid and Potassium Thiocyanate Media"Fresenius' Journal of Analytical Chemistry. (in press). (2000)

K. Z. Hossain 和 T. Honjo：“用冠醚从盐酸和硫氰酸钾介质中分离痕量钯 (II)”费森尤斯分析化学杂志。

K. Z. Hossain and T. Honjo: "Extraction Behavior of Platinum(II) in Chloroform with Crown Ether from Acidic Media"Proceedings of ISEC'99 (Society for Chemical Industry, London). (in press). (1999)

K. Z. Hossain 和 T. Honjo：“从酸性介质中用冠醚在氯仿中萃取铂 (II) 的行为”ISEC99 会议记录（伦敦化学工业协会）。

K.Z. Hossain and T. Honjo: "Extraction Behavior of Platinum (IV) in Chloroform with Crown Ether from Acidic Media"Proceedings of ISEC'99 (Society for Chemical Industry, London). in press. (1999)

K.Z.