Synthesis of silica gel immobilized thiourea and its application to the on-line preconcentration and separation of silver, gold and palladium

摘要: A new silica gel based chelating sorbent with thiourea as a functional group was used for the flow injection (FI) on-line preconcentration and separation of trace levels silver, gold palladium. Its sorption characteristics were evaluated by FI-FAAS. The selected metal ions adsorbed on column packed modified (TuSG) sampling rate 5.0 ml min1, eluted 5% 2.5 min1 determined FAAS. Common co-existing did not interfere determination. detection limits, defined three times standard deviation blank (3σ), Ag, Au Pd are 1.3, 14 21 ng ml1, respectively, 1 min sample loading time. RSD is more than 3.0% 0.040 µg ml1 0.20 0.30 Pd. With 40 time, 1.0 7.5 successfully preconcentrated. total dynamic capacity TuSG 24.5, 50.9 30.3 mg g1 Pd, respectively. exhibited excellent stability. properties change after 1000 cycles use. metals in secondary nickel alloy, an anode slime, electrolytic solution national certified ore samples satisfactorily using proposed method.