Trace measurements of beryllium by adsorptive stripping voltammetry and potentiometry

✍ Scribed by Joseph Wang; Baomin Tian

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 323 KB
• Volume: 270
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)80100-l

✦ Synopsis

A highly sensitive electrochemical stripping procedure for ultratrace measurements of beryllium, in which preconcentration is achieved by the adsorption of the beryllium-thorin complex onto a stationary mercury electrode is described. Both voltammetric and potentiometric stripping modes are used to follow the reduction of the adsorbed complex. Optimal conditions were found to be a stirred ammonium buffer (pH 9.1) solution containing 1 x 10 -7 M thorin, a preconcentration potential of -0.48 V and a differential pulse scan. For a 2-min preconcentration time, the detection limit found was 30 ng 1-1 (3 x 10 9 M). The relative standard deviation (at 2/zg 1 -l) is 1.9%; most metal ions do not interfere.