Hexaacetato calix(6)arene as the novel extractant for palladium
Hexaacetato calix(6)arene as the novel extractant for palladium
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DOI：
10.1016/s0039-9140(97)00013-1
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发表时间：
1997-10-01
期刊：
影响因子：
6.1
通讯作者：
Khopkar, SM
中科院分区：
文献类型：
--
作者：
Mathew, VJ;Khopkar, SM
提出了一种新的溶剂萃取钯的方法。超分子化合物六乙酰基杯（6）芳烃在甲苯中的低浓度下在pH 7.5定量萃取微克浓度的钯。可以用2 M硝酸从有机相中将其剥离，并在635 nm处以氯化亚锡络合物的形式进行光度测定。浸提物质的可能组成为Pd（HR）（2）Cl。低至1 × 10（-3）M的萃取剂足以进行定量萃取。甲苯为最佳稀释剂。用硝酸和高氯酸（1.5-3 M）完成反萃取。钯以大比例从碱金属和碱土金属中分离出来（1：50）。主族元素以较高的比例（1：25）耐受，但锌、镉、铁、镍、铂、钍、钒和铼等离子以低浓度（1：1）耐受。干扰较强的离子为铜、铬。相对标准偏差为+/-1.1%。(C)1997年Elsevier Science B.V.
A novel method is proposed for the solvent extraction of palladium. A superamolecular compound, hexaacetato calix(6)arene in low concentration in toluene quantitatively extracts microgram concentration of palladium at pH 7.5. It can be stripped from the organic phase with 2 M nitric acid and determined spectrophotometrically as its stannous chloride complex at 635 nm. The probable composition of the extracted species is Pd(HR)(2)Cl. As low as 1 x 10(-3) M of extractant is adequate for quantitative extraction. Toluene was the best diluent. With nitric and perchloric acid (1.5-3 M) the stripping was complete. Palladium was separated in large ratios from alkali and alkaline earths (1:50). The main group elements were tolerated in higher ratios (1:25), but ions like zinc, cadmium, iron, nickel, platinium, thorium, vanadium and molydenum were tolerated at low concentrations (1:I). The ions showing strong interference were copper, chromium. The relative standard deviation is +/- 1.1%. (C) 1997 Elsevier Science B.V.