FAAS Determination of Platinum Using an On-Line Separation and Preconcentration System with a Polymelamine Dendrimer Immobilized Silica Gel

Abstract

A G4.0 polymelamine dendrimer based on silica gel (PMDSG) was fabricated via a divergent approach via repetitive reaction of 2,4,6-trichloro-1,3,5-triazine and 1,6-hexylenediamine from a γ-aminopropyl silica gel (APSG) core for the first time. It was then used as the microcolumn packings for the flow injection (FI) preconcentration and separation of trace or ultra trace Pt(IV) for the flame atomic absorption spectrometry determination. A limit of detection (LOD) of 0.065 µg mL⁻¹ was achieved when a 0.500 µg mL⁻¹ Pt(IV) was preconcentrated at pH 3.0 with a sampling flow rate of 5.0 mL min⁻¹ for 60 s and the relative standard deviation (RSD) was no more than 5.0%. The proposed method was successfully used for the determination of Pt in two metallurgical samples.

Keywords:

• Polymelamine dendrimer based on silica gel
• Flow injection
• On-line preconcentration and Separation
• Platinum
• Flame atomic absorption spectrometry

Acknowledgments

The financial support of the University Key Teacher by the Ministry of Education (No. 65, 2000) and the Foundation of Doctoral Programs of the Ministry of Education (No. 21) of China were gratefully acknowledged.