Abstract
The utility of glass carbon electrode modified with Nafion for the cathodic stripping voltammetric determination of iron (III) is demonstrated. The method is based on the formation of the Fe(III) and αα-bipyridine complex, which is preconcentrated by a Nafion-modified electrode at +0.75V (vs Ag-AgCl). A stripping scan is carried out from +0.75 to −0.10 V at 100 mV/s scan rate. The favorable concentration of the base solution contains 0.02 mol/liter LiCl, 0.03 mol/liter HCL, and 1.0 × 10 −5 mol/liter αα-bipyridine (pH 2.5). Under the optimal conditions, the peak current is proportional to Fe(III) concentration in the range of 0.05-2.0 ng/ml (2 min preconcentration time). The method has been used to determine iron in fountain water and longan with satisfactory results.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
