PRECISE ANALYSIS OF SILVER BY FLOW-INJECTION ANALYSIS WITH STRIPPING VOLTAMMETRIC DETECTION

Flow‐injection analysis (FIA) with voltammetric detection can be used in either the direct voltammetric or the stripping mode. In this study, a locally designed and constructed instrument with features not available in commercial instruments was used for the precise analysis of silver in aluminum. The carrier solution was 0.1 M Al(NO3)3 with 2 × 10−3 M HNO3. Silver solution was introduced by timed, partial‐loop injection. After cathodic deposition, a square‐wave or staircase voltammetric stripping sweep was applied. The data were recorded and analyzed by computer. Silver solutions of 8 × 10−8 to 4 × 10−5 M were tested. The standard deviations of repeat determinations of artificial samples varied from 0.12 to 0.78%. This precision was limited by the stability of the pump flow. Copyright © 1990 VCH Publishers, Inc.