Paper Information

Journal:   IRANIAN INTERNATIONAL JOURNAL OF SCIENCE   Spring 2002 , Volume 3 , Number 1; Page(s) 23 To 42.
 
Paper: 

FAST DIRECT AND INDIRECT DETERMINATION OF SE (IV) AT GOLD ULTRAMICROELECTRODE IN FLOW INJECTION ANALYSIS USING FAST FOURIER TRANSFORM SQUARE WAVE VOLTAMMETRY

 
 
Author(s):  NOUROUZI PARVIZ*, SHEIKHYNEJAD M., VATANKHAH G.
 
* Department of Chemistry, Faculty of Science,
 
Abstract: 
Electrochemical (EC) data, in particular, when the magnitude of current is in range of nano and pico ampere, suffers from existence of environmental noises. In this work, a new modified SW voltammetric method for determination of Se(IV) is presented. Where signal-to-noise ratio has significantly (near to 620 times) increased by application of discrete Fast Fourier Formation (FFT) method, background subtraction and two-dimensional integration of the electrode response over a selected potential range and time window. Also, the detection method can be used for direct and indirect determination of Se(IV) ions by measuring the changes in SW voltammogram (or admittance) of an gold ultramicroelectrode (in 0.05 M H3PO4 solution) caused by redox reaction or just adsorption of the Se(IV) ion on the electrode surface. In indirect detection, the analyte signal was calculated based on admittance changes related to inhibition of oxygen adsorption (by adsorbed of Se(IV) ions). Direct measurement was carried out in on an anodic stripping mode, after accumulation of the analytes on the electrode surface for 50 to 100 ms. In method, removal of oxygen from the studied solutions is not required. Calibration plots are given for solutions containing 10-8–10-7 M and 10-7–10-6 M of Se(IV) Se4+. The limit of detection is calculated to be 2.5 ´10-9 M. The relative standard deviation at concentration 3´10-8 M is 6 % for 5 reported measurements
 
Keyword(s): FAST FOURIER TRANSFORMATION, SQUARE WAVE VOLTAMMETRY, GOLD ULTRAMICROELECTRODE, FLOW-INJECTION, SELENIUM
 
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