The Anodic Stripping Voltammetry of Industrial Effluent

1963 mg L and containing 22.6 ppm pesticide, 6.7 ppm herbicide, trace acetone, methanol and xylene. Copper was pre-concentrated on a glassy carbon electrode at a voltage of -1.0 V (vs SCE) after the addition of concentrated KCl to the effluent. After a period of 30 seconds of deposition, the potential was scanned in a positive direction to produce the trace shown in Fig. 9.12. The responses shown are those seen under silent conditions and under insonation. 

After 30 seconds, when a significant deposit of Cu(s) has built up on the glassy carbon electrode, the potential is then scanned towards positive 

The size of this stripping signal is used to quantify the amount of material deposited on the electrode, and hence the amoimt of Cu(II) in solution. 

13 Adsorptive Stripping Voltammetry at Carbon Nanotube Modified Electrodes 

Explain the technique of adsorptive stripping voltammetry (AdSV). Carbon electrodes are often modified with a layer of carbon nanotubes to increase the sensitivity of AdSV. Suggest a reason why, and discuss the types of analytical targets that might most usefully benefit from this approach. 

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