Spectrophotometric determination of some aromatic amines.

A method for spectrophotometric determination of four aromatic amines is described. The method is based on the reaction between the amine and the colorless Fe(III)-ferrozine complex. The amine reduces iron from Fe(III) to Fe(II) which forms a violet colored complex with ferrozine.

Spectrophotometric determination of enzymatically generated hydrogen peroxide using Sol-Gel immobilized horseradish peroxidase.

Peroxidase entrapment in different Sol-Gel matrices was successful. The enzyme did not show a decrease in activity for at least 2 months as well as storage at room temperature and dry condition for periods exceeding 3 weeks. It was evident that the enzymatic activity was a function in the type of the alkoxysilane precursor.

Electrochemical study on the determination of tinidazole in tablets.

The electrochemical reduction of tinidazole has been carried out in aqueous solution in the pH range 1.8-11.3 by differential-pulse (DP) polarography.

Adsorptive stripping voltammetric analysis of 2,4,6-tri(2'pyridyl)-1,3,5-triazine at a mercury electrode.

The redox behaviour of adsorbed species of 2,4,6-tri(2'-pyridyl)-1,3-5-triazine (TPTZ) at the surface of a mercury electrode was examined using cycling voltammetry. Based on the adsorption and accumulation of TPTZ at the charged mercury surface cathodic adsorptive stripping voltammetry (CSV) is applied for the trace determination of TPTZ using a differential pulse (DP) technique. Experimental and operational parameters for the quantitative analysis of TPTZ are optimized and the detection limit was found to be 3x10(-9) mol/l.