Analytical Sciences

Abstract − Analytical Sciences, 19(3), 409 (2003).

On-line Separation and Preconcentration of Silver Ion on Amidino-Thiourea Immobilized Glass Beads Packing in Flow Injection Analysis with Atomic Absorption Spectrometric Detection
Peng LIU, Qiaosheng PU, Qiaoyu SUN, and Zhixing SU 
Chemistry Department of Lanzhou University, Gansu, 730000, China
Amidino-thiourea immobilized glass beads (AGB I) were prepared and used as the microcolumn packing for the flow injection (FI) on-line separation and preconcentration of Ag(I) coupled with atomic absorption spectrometry (AAS) determination. Base metal ions and anions with a concentration of 2.0 mg mL-1 had no interference with the determination of Ag(I). The limit of detection (LOD) of Ag(I) for a preconcentration time of 60 s with a sampling flow rate of 5.0 mL min-1 for 40.0 ng mL-1 of Ag(I) were 0.50 ng mL-1 with the peak-height absorbance mode and 1.26 ng mL-1 with the peak-area absorbance mode, respectively. The relative standard deviations (RSD) of 7 replicate determinations were 0.9% and 0.7% for the peak-height absorbance (H) and the peak-area absorbance (A), respectively. The method was successfully applied to the determination of Ag(I) in ore samples.