Chronopotentiometric stripping analysis of selenium using mercury film electrode
2002
Suturovic, Z.J. | Svarc-Gajic, J.V. | Marjanovic, N.J. | Kravic, S.Z. (University of Novi Sad, Novi Sad (Serbia and Montenegro). Faculty of Technology, Department of Chemistry)
The influence of the most important exerimental factors in chronopotentiometric stripping analysis (CSA) of selenium (IV) using mercury film working electrode was examined. Interference of copper, iron and lead were investigated as well. The possibility of avaiding prolonged deaeration of the solution was examined by applying medium exchange modification of the technique, where the dissolution of the deposit was performed in calcium-chloride solution. Determination limits obtained for the modification of the CSA with prior deaeration and medium exchange modification were 0.4 microgram/cubic dm and 1.15 microgram/cubic dm, respectively. Accuracy of the defined techniques has been confirmed by analysing reference material (RM 8436) - wheat durum flour. The results obtained by applying both modifications of the technique showed a very good agreement of total selenium content with declared value.
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