protocol. Clearly, if it were possible to determine chloride ion through the use of microvolumes, the described procedure could be much facilitated. Therefore, the development of a technique to determine the composition of analyte in microsamples is essential for the understanding of phenom- ena that take place at the micro level in size and volume. Here we report a new protocol for stripping voltammetry which overcomes two of the discussed drawbacks of the previously reported techniques: (i) it allows the analysis of μL-samples, and (ii) it overcomes the constraints of solubil- ity of compounds precipitated for preconcentration.
Although the method of evaporating the solvent from a micro-sample has been previously used in the determination of some heavy metals, this requires a local change in the hydrophilic/ hydrophobic properties of the working electrode surface [16]. In the technique presented here, the electrode surface is a single receiver of a micro-volume of sample, requiring no further treatment than the evaporation.