Atomic absorption spectrometry of silver collected on ion-exchange filter paper by directly heating the filter paper.

Abstract

In this paper direct determination of silver collected on ion-exchange filter paper was studied. 50 ml of sample solution of which pH was adjusted to 3.3 with hydrochloric acid was passed through a sheet of ion-exchange filter paper, and after the filter paper was dried, it was punched with a 2.5 mm puncher. The small tablet was put onto a tungsten atomizing furnace and electrothermally heated. The calibration curve was linear at Ag+ concentrations below 0.3 ng/ml, and 1% absorption sensitivity was 1.2×10-3 ng/ml. Coexsisting 104-fold Na+, 103-fold Cu2+, and 103-fold Pb2+ did not affect the absorbance of Ag. Detection limit of this method is considered to lower by increasing the volume of sample solution.