Extraction Behavior of Trace Amounts of Precious Metals with Crown Ethers

各种因素的影响（溶剂、代理集中、冠状乙醚、羟基酸、脱衣舞代理、摇晃时间等）在羟基酸中的提取物和反向提取物（II）（1 ~ 10 mol/L）和含有二氯环己烷-18-冠-6（DC 18 C6）的三硫氰酸介质进行了详细的有机溶剂调查。在结果的基础上，建议的程序被提出如下：一种含有钯（10 μ g/mL）和硫氰酸钾（0.05 mol/L）的样品溶液（10毫升），将其放入30毫升玻璃凝固的离心管中。含有0.05 mol/L DC 18 C6的10毫升氯福溶液添加到中央燃料管，并且混合物在5分钟的振荡机器上摇动。两个相位在2000 rpm的转速下分离，然后将其插入另一个管子。有机相位（10毫升）含有提取的钯，用10毫升0.1 M氨缓冲液（0.1 mol/LNH 4Cl： 0.1 mol/LNH 3 = 1：1）溶液溶解5分钟。有机相位中提取的钯数量由火焰AAS确定。Palladium in hydrochloric acid and thiocyanate meManagement has been extracted quantitatively in chloroform with DC14C6 as an ion-association species of [K·DC14C_ palladium在保证试剂分级后的chloroplatinic acid of guaranteed reagent grade中的内容被发现为31.66 μ g/g。

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.