Determination Of Organic Pollutants In Water Samples By Electrochemical Methode

Determination of organic pollutions in water by electrochemical method causes more and more people's attention. In my paper, 2-nitroaniline was determined by differential pulse voltammetry in Britton-Robinson and ethanol medium. In this experiment, optimal experimental conditions such as buffer solution, pH, ethanol concentration , initial potential, scan rate were selected. Moreover, adsorptive property of compound on electrode was studied by some methods, such as linear sweep voltammetry , normal pulse voltammetry , electrocapillary measurement , cyclic voltammetry. 2,4-dinitro-l-naphothol was determined by differential pulse stripping voltammetry since stripping voltammetry can increase the sensitivity of determination. Optimal experimental conditions such as medium , pH, deposit potential, deposit time, scan rate were selected. In these conditions, two peaks were completely separated and at the same time the highest peak currents were obtained. One of them was selected as quantitative peak. There is a good linear relationship between the peak current and the compound concentration that is to be determined. Satisfactory results were obtained in determining synthetic water samples. This method can be applied to determine the environmental water sample. In addition, 2-nitroaniline , 3-nitroaniline and 4-nitroaniline in water sample were simultaneouslydetermined by differential pulse voltammetry and chemometrics. Pollutants which peaks were severely overlapped can not be separately determined by electrochemical method whithout pretreatment . This method solves the difficulty. The experimental result is satisfactory.