Plumbum ion detection based on gold nanoparticles enhanced room temperature phosphorescence of diiodofluorescein on filter paper substrate

• 1、Department of Chemistry, College of Chemistry and Chemical Engineering,Xiamen University
• 2、Department of Chemistry, College of Chemistry and Chemical Engineering,Xiamen University, Xiamen 361005
• 3、State Key Lab of Marine Environmental Science ,Xiamen University, Xiamen 361005

Abstract：Uniform grading Au nanoparticles (AuNPs) reduced by sodium citrate in the presence of 11-Mercaptoundecanoic acid (MUA) were obtained. Metal-enhanced room temperature phosphorescence (MERTP) signal of diiodofluorescein (DIF) on the filter paper surface in the presence of AuNPs was firstly observed. However, DIF-MERTP was quenched by the addition of trace Plumbum ion(Pb2+). Based on this phenomenon, a new method for determination of Pb2+ had hereby been developed. Under the optimized experimental conditions, the detection limit for Pb2+ was 6.10 pmol/L, the response is linearly proportional to the concentration of Pb2+ in the range 0.474-22.10 nmol/L. The recovery of Pb2+ was in range of 89.4%-111.5%. A satisfactory results were obtained when the established method has been applied to determine Pb2+ in artificial sample.

Keywords： AuNPs DIF MERTP Pb2+ detection