A Highly Sensitive Method for Determination of Monobutyltin in Aqueous Media by Stripping Voltammetry at a Renewable Silver Amalgam Annular Band Electrode

作者：Niewiara Ewa^*

来源：Electroanalysis, 2013, 25(8): 2007-2014.

DOI：10.1002/elan.201300218

• Tin
• Monobutyltin
• Silver amalgam electrode
• Stripping voltammetry
• Trace analysis

An adsorptive stripping voltammetric (AdSV) procedure for the determination of monobutyltin in aqueous media at a silver liquid amalgam film-modified silver solid amalgam annular band electrode (AgLAFAgSAE) is described. Determination of monobutyltin proceeds in two steps. At the beginning monobutyltin ions (BuSn3+) are accumulated from 0.1M NH4NO3 and 10% ethanol solution at a potential of -0.2V, than the BuSn0 film is preconcentrated at the working electrode surface at a potential of -0.7V. After this step the DP AdSV voltammogram is recorded. The analytical parameters and the procedure of the electrode regeneration and activation were optimized. The calibration curve of monobutyltin in the range 0.02-0.30mgL(-1) is linear (r=0.9973). The detection limit for 5s of preconcentration, calculated as 3 sigma of the blank was equal to 0.004mgL(-1), repeatability of the peak current was 1.8% (n=5). Repeatability and sensitivity of monobutyltin determination depends strongly on the analyzed solution properties, measurement conditions and the working electrode quality. The proposed procedure was tested by means of monobutyltin determination in tap waters.

• 出版日期2013-8