Abstract
Stripping analysis employing adsorption preconcentration has been applied for the trace determination of xanthine at the hanging mercury drop electrode (HMDE). The adsorption and redox behavior are indicated by ac and cyclic voltammetry. The strong interaction of xanthine with the mercury electrode leads to the formation of an adsorbed film of Hg(II)-xanthate compound at the electrode surface. The formation of this film is followed by differential pulse stripping voltammetry. The method has been developed in the presence of copper, due to the strong accumulation of the Cu(II)-xanthate complex at the surface of HMDE. Experimental and instrumental parameters for the quantitative analysis are optimized. Under the optimum conditions the calibration curve was linear and the detection limit is 3 × 10-10 mol/L, whereas in the presence of Cu(II) the method is developed and the detection limit is lowered to 2 × 10-11 mol//L. The interferences of several organic compounds are described.
| Original language | English |
|---|---|
| Pages (from-to) | 6-9 |
| Number of pages | 4 |
| Journal | Analusis |
| Volume | 24 |
| Issue number | 1 |
| State | Published - 1996 |
| Externally published | Yes |
Keywords
- Hanging mercury drop electrode
- Stripping analysis
- Xanthine
ASJC Scopus subject areas
- General Chemistry
- General Engineering