earticle

한국어

Manganese which is eluted from the sediment can be toxic to humans, so we need a method of measuring the exact concentration of manganese. Generally, when measuring manganese in rivers and lakes, most of them analyse the concentration using the ex-situ method. This method takes lots of time and manpower for analysing sediments of rivers and lakes. To solve this problem, use of a voltameter on site at different depths of sediments in river was considered instead of doing an ex-situ analysis. A microelectrode made of gold-amalgam was developed as a working electrode, and the square voltammetry device using this electrode was then studied for its accuracy in measuring manganese present in the voids of river sediments. We examined the correlation of the electrode current with Mn2+ concentration through calibration. For this purpose, we analysed currents 3 times per each concentration ranging from 0.1 to 0.4 mM at 0.1 increment. As a result, coefficient of determination was found to be 0.98, suggesting good correlation. Developed microelectrode looks promising to be used for reliable voltammetry of Mn2+ concentration.