论文部分内容阅读
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％。
Concentration ppb grade copper (II) and nickel (II) in aqueous solution can be enriched with silica gel loaded with 4- (2-pyridylazohe) -resorcinol (PAR) and measured spectrophotometrically. In the batch-wise equilibrium method, copper is completely adsorbed by PAR-SG when it is shaken at pH 1.5-5.5 for more than 60 minutes, whereas nickel is completely adsorbed by shaking at pH 5.5-8 for more than 90 minutes. The net adsorption of copper (Ⅱ) and nickel (Ⅱ) by PAR on PAR-SG was 15μmol / gPAR-SG and 8.5μmol / g PAR-SG, respectively. Copper (II) can be completely eluted from the PAR-SG column with 0.25 mol / l thiourea containing 0.005 mol / l HCl while nickel needs to be eluted with 0.05 mol / l HCl so that copper and nickel can be eluted from their The mixed solution separated from each other. Enrichment multiple of up to 200, copper, nickel recovery rates were greater than 95%.