Abstract：Zn2+ had significant catalytic effect on the oxidization reaction of phloxine by sodium periodate in phosphate (PBS) buffer solution containing cetyltrimethylammonium bromide (CTMAB). Then, the fluorescence intensity was reduced remarkably. According to this principle, a new determination method of trace Zn2+ by dual catalytic kinetic fluorimetry was established based on the synergy effect of Zn2+ and silver nanoparticle. The results showed that, when the concentration of periodate, NaIO4, silver nanoparticle and CTMAB in PBS buffer solution (pH 7.8) was 2.0×10-6 mol/L, 5.0×10-3 g/L, 5.0×10-6 mol/L and 1.5×10-3 g/L, respectively, the concentration of Zn2+ in the range of 5×10-8-100×10-8 g/L showed good linearity to the change of fluorescence intensity of system. The detection limit was 1.88×10-8 g/L. The proposed method was applied to the determination of Zn2+ in electroplating industrial wastewater. The found results were consistent with those obtained by dithizone photometric method. The relative standard deviation (RSD) was less than 2.5%.
Vellaichamy S, Palanivelu K. Preconcentration and separation of copper, nickel and zinc in aqueous samples by flame atomic absorption spectrometry after column solid-phase extraction onto MWCNTs impregnated with D2EHPA-TOPO mixture [J]. J. Hazard. Mater., 2011,185(2-3): 1131-1139.
[4]
Ansari R, Delavar A F, Mohammad-khah A. Solid-state ion selective electrode based on polypyrrole con ducting polymer nanofilm as a new potentiometric sensor for Zn2+ ion [J]. J. Solid State Electrochem., 2012, 16(10): 3315-3322.
