摘要
用载有2-(5-溴-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)的改性硅胶(5-Br-PADAP-SG)可以分离、富集水样中的铜和镍。研究结果表明,5-Br-PADAP-SG 对铜、镍的最大吸附量分别是30.1μmol/g、16μmol/g。经5-Br-PADAP-SG 柱富集后,先用0.2mol/l 的硫脲(含0.01mol/l HCl)洗脱铜,再用0.2mol/l 的 HClO_4洗脱镍,以5-Br-PADAP 光度法可测定 ppb 级的铜、镍,富集倍数可达200倍以上,分离效果良好。
2-(5-Bromo-pyridylazo)-5-diethyla nino-phenol(5-Br-PADAP)loaded on silica gel isused for preconcentration of ppb levels ofcopper(Ⅱ)and nickel(Ⅱ)from aq(?)eoussolution,followed by spectrophotometnicmeasurement.In batch experiment,absorptionof copper(Ⅱ)and niekel(Ⅱ)were completedafter shaking over 60 min.The absorptioncapacity of the 5-Br-PADAP on SG is 30.lμmol Cu/g5-Br-PADAP-SG and 16.0μ molNi/g5-Br-PADAP-SG.Copper(Ⅱ)retained on the5-Br-PADAP-SG column was completely elutedwith 0.2 mol/l thiourea ia 0.01 n(?)/lhydrochloric acid,then nickel(Ⅱ)was elatedonly by 0.2 mol/l porchloric acid.Recoveryof both metals is over 95%.
出处
《化学试剂》
CAS
CSCD
北大核心
1989年第4期208-211,共4页
Chemical Reagents
