【摘要】 用载有4-(2-吡啶偶氦)-间苯二酚(PAR)的硅胶可以富集水溶液中ppb级的铜(Ⅱ)和镍(Ⅱ),用分光光度法测量。在分批平衡法中,铜在pH1.5-5.5范围振荡60分钟以上可被 PAR-SG完全吸附,而镍则在pH 5.5—8范围振荡90分钟以上才完全被吸附。由PAR-SG上的PAR引起的对铜(Ⅱ)、镍(Ⅱ)的净吸附分别为15μmol/gPAR-SG和8.5μmol/g PAR-SG。用含有0.005mol/l HCl的0.25mol/l硫脲可从PAR-SG柱上完全洗脱铜(Ⅱ),而镍需用0.05mol/l的HCl洗脱,这样铜、镍可从它们的混合溶液中互相分离开来。富集倍数可达200以上,铜、镍的回收率均大于95％。更多还原

【Abstract】 4-(2-Pyridylazo)-Resorcinol (PAR) loaded on silica gel is used for preconcentration of ppb levels of copper(Ⅱ) and nickel(Ⅱ) from aqueous solution, followed by spectrophoto-metric measurement. In batch experiment, copper and nickel were quantitatively retained on the PAR-SG from solution of pH 1.5-5.5 and 5. 5-8 after shaking over 60 min and 90 min, respectively. The absorption capacity of the PAR on SG is 15 μmol Cu/g PAR-SG and 8.5 μmol Ni/g PAR-SG, Copper(Ⅱ) retained on the PAR-SG column was completely eluted with 0,25 mol/l thiourea in 0.005mol/l hydrochloric acid. But for nickel(Ⅱ), only 0.05mol/l perchloric acid was used. Therefore copper(Ⅱ) and nickel(Ⅱ) can be separated from the mixed solution. A concentration factor of 200 can be achieved. Recovery of both metals is over 95% .更多还原