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Title

APPLICATION OF HEMOGLOBIN MODIFIED PENCIL LEAD ELECTRODE FOR THE ELECTROCATALYTIC REDUCTION OF PERSULFATE

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Abstract

 UTILIZATION OF THE DIRECT ELECTROCHEMISTRY OF REDOX PROTEINS HAS ATTRACTED MUCH INTEREST IN RECENT YEARS. BECAUSE OF ITS KNOWN STRUCTURE AND COMMERCIAL AVAILABILITY, HEMOGLOBIN (HB) IS CONSIDERED AS AN IDEAL MODEL MOLECULE FOR SUCH STUDY. HB HAS BEEN SHOWN TO POSSESS ENZYME-LIKE CATALYTIC ACTIVITY [1].ON THE OTHER HAND PERSULFATE (PEROXYDISULFATE) IS A STRONG OXIDANT AND HAS BEEN USED FOR MANY APPLICATIONS SUCH AS WATER AND SOIL DECONTAMINANTS AND COSMETICS. IT HAS BEEN REPORTED THAT PERSULFATE MAY EITHER CAUSE OR INTENSIFY DISEASES SUCH AS ASTHMA AND SKIN REACTIONS [2]. BECAUSE OF A GRADUAL INCREASE IN APPLICATION OF PERSULFATE, FINDING A SIMPLE AND CONVENIENT MEASUREMENT OF PERSULFATE IS DESIRED. THEREFORE, MANY STUDIES HAVE BEEN PERFORMED FOR THE QUANTITATIVE DETERMINATION OF PERSULFATE. HOWEVER, ELECTROCHEMICAL METHODS HAVE RECEIVED CONSIDERABLE INTEREST DUE TO ITS SIMPLICITY AND COST-EFFECTIVENESS WHEN COMPARED WITH OTHER METHODS [3].IN OUR PREVIOUS STUDY, THE MODIFICATION OF PENCIL LEAD ELECTRODE BY A THIN FILM OF HEMOGLOBIN (HB/ PLE) IS EMPHASIZED [4]. IN THIS STUDY, THE MECHANISM OF CATALYTIC REDUCTION OF PERSULFATE AT HB/PLE WAS STUDIED. THE OBTAINED BIOSENSOR IS EXPLOITED FOR THE HYDRODYNAMIC AMPEROMETRY OF PERSULFATE. IT IS FOUND THAT THE CALIBRATION GRAPH IS LINEAR IN THE S2O82- CONCENTRATION RANGE 2.5 TO 50 MM AND THE DETECTION LIMIT OF 0.6 MM. DEVELOPED BIOSENSOR WAS SUCCESSFULLY USED FOR THE DETERMINATION OF S2O82- IN DECOLORIZING POWDERS.

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