Preparation of poly(propyleneimine) dendrimer immobilized silica gel and its application as novel microcolumn packing for the on-line FI preconcentration and separation of platinum.
A G4.0 poly(propyleneimine) dendrimer immobilized silica gel (PPID-SG) was prepared with a divergent approach from gamma-aminopropyl silica gel (APSG) by repeating the reactions: 1) cyanoethylation of -NH2 and 2) reduction of -CN. Then it was successfully applied as the microcolumn packing for the on-line flow-injection (FI) preconcentration and separation and flame atomic absorption spectrometry (FAAS) determination of Pt. A limit of detection (LOD) of 0.014 microg/mL was obtained when 0.5 microg/mL Pt in chloride acid of PH = 3 was preconcentrated with a sample flow rate of 4.6 mL/min for 60s and the relative standard deviation (RSD) was 2.65%. Coexisting metal ions with concentration of 5.0 mg/mL and anion ions of 20.0 mg/ml have no interference in the determination of Pt. The proposed method was successfully applied to the determination of Pt in nickel alloy and anode slime samples.
Liu
Peng
P
College of chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 China. pliu@lzu.edu.cn
Wu
Xiongzhi
X
Pu
Qiaosheng
Q
Su
Zhixing
Z
D050091:Dendrimers / Q000138:chemical synthesis*; D017022:Flow Injection Analysis / Q000379:methods*; D010984:Platinum / Q000032:analysis*; D011126:Polypropylenes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods
D050091:Dendrimers; D011126:Polypropylenes; C021611:aminopropyl silica gel; C443641:poly(propyleneimine); D010984:Platinum; D012822:Silicon Dioxide