Adsorptive stripping analysis

Adsorptive stripping analysis involves pre-concentration of the analyte, or a derivative of it, by adsorption onto the working electrode, followed by voltanmietric iiieasurement of the surface species. Many species with surface-active properties are measurable at Hg electrodes down to nanoniolar levels and below, with detection limits comparable to those for trace metal detemiination with ASV. 

Adsorptive stripping analysis greatly enhances the scope of stripping measurements toward numerous trace elements (23,24). This relatively new strategy involves the... 

Application of adsorptive stripping analysis to the determination of nucleic acids at mercury electrodes has also been reported [195]. Tomschik etal. [196] have studied reduction and oxidation of peptide nucleic acid and DNA at mercury and carbon electrodes. The authors have utilized cyclic and square-wave voltammetries to study reduction and oxidation signals of single-stranded peptide nucleic acid and DNA decamers and pentadecamers. 

Adsorptive stripping analysis greatly expands the scope of stripping measurements towards numerous trace metals (e.g., Cr, Al, Fe, Y, Mo... 

Ruhlig, D. Schulte, A. Schuhmann, W., An electrochemical robotic system for routine cathodic adsorptive stripping analysis of ni2+ ion release from corroding niti shape memory alloys, Electroanalysis 2006, 18, 53-58... 

Cai, X., Rivas, G., Farias, P. A. M., Shiraishi, H., Wang, J., Palecek, E. (1996). Evaluation of different carbon electrodes for adsorptive stripping analysis of nucleic acids. Electroanalysis 8, 753-758. 

Table 5. Examples of the adsorptive stripping analysis 5A. Metal-complex adsorptive stripping analysis...

Hutton EA, Hocevar SB, Ogorevc B, Smyth MR (2003) Bismuth flhn electrode for simultaneous adsorptive stripping analysis of trace cobalt and nickel using constant current chronopotentiometric and voltammetric protocol. Electrochem Commun 5 765... 

Table 1. Conditions for DPP-adsorptive-stripping Analysis. Duration of Accumulation 180s to 360s (unstirred) Electrode area 0.042 cm. ...

The accumulation effect can be exploited also for adsorptive stripping analysis of polarographically reducible surface active compounds. As an example, the local anaesthetic Percaine Ciba (Table 1) can be mentioned the obtained peak belongs to the reduction of the adsorbed compound (Figure 3). Other examples of adsorptive accumulation of electroactive compounds are the Ge (Figure 5) and Cu surface active complexes mentioned in Table 1. In the case of the adsorbable complexes mentioned the method is suitable mainly for metals where the amalgam formation is complicated or where the solubility of the metal in mercury is low. 

Economou A, Fieldtai PR (1997) Applications, pofimtialities and limitations of adsorptive stripping analysis on mercury film electrodes. Trends Anal Chem 16 286-292... 

Yang W, Gooding JJ, Hibbert DB (2001) Characterisation of gold electrodes modified with self-asseanbled monolayers of L -cysteine for the adsorptive stripping analysis of copper. J Electroanal Chem 516 10-16... 

Bobrowski A, Kalcher K, Kurowska K (2009) Microscopic and electrochemical characterization of lead film electrode applied in adsorptive stripping analysis. Electrochim Acta 54 7214-7221... 

Thus, classical electrochemical stripping analysis (ESA) had spawned an offspring—adsorptive stripping voltammetry (AdSV) that became soon one of the most frequent techniques in electrochemical trace determination of metals (see, e.g., reference (113) and references therein). The determinations by AdSV and the related potentiometric method, constant current (adsorptive) stripping analysis, CCSA, are characterised by high selectivity which can be yet improved in the open-circuit arrangement and/or medium exchange.AdSV also offers remarkable detection capabilities down to the nanomolar level (see Table 5.2 and references (94, 97, 108, 110)). 

---