摘要
将1-(2-吡啶偶氮)-2-萘酚(PAN)吸附在硅胶(SG)上,制备得到改性硅胶PAN-SG。PAN-SG对Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)的最大吸附量分别为3.1,1.8,1.8μmol/g。用PAN-SG色层柱可以富集Cu(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)等金属离子,富集倍数超过200,金属离子的回收率大于95％;Cu(Ⅱ)与Cd(Ⅱ)、Mn(Ⅱ)可以在PAN-SG柱上直接分离;选择合适的洗脱液,可使性质相近的Cu(Ⅱ)、Co(Ⅱ)得到分离。用PAN-SG柱富集人工水样和天然水样,用PAN分光光度法测定Cu(Ⅱ)的下限可达ppb级。
1-(2-Pyridylazo)-2-Naphthol loaded on silica gel (PAN-SG) is used for preconcentra-tion and separation of ppb level of copper(Ⅱ), cobalt(Ⅱ) and nickel(Ⅱ) etc. followed by spectrophotometric measurement. In batch experiment, copper(Ⅱ) and cobalt(Ⅱ) were quantitatively retained on PAN-SG from solution of pH 4-6 and 5-8 after shaking over 30 min, but for nickel (Ⅱ), pH must be over 8 and shaking time is over 120 min. The capacities of PAN-SG are 3.1 μmol Cu/g, 1.8 μmol Co or Ni/g. Copper(Ⅱ), cobalt(Ⅱ) and nickel (Ⅱ) retained on PAN-SG column were completely eluted with suitable eluants. The recoveries are over 95% and concentration factors are over 100. Some samples satisfactorily have been determined with this method.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1992年第2期202-208,共7页
Acta Scientiarum Naturalium Universitatis Pekinensis
关键词
硅胶
PAN
预富集
分离
金属
Preconcentration
Separation
PAN-SG
Spectrophotometry
