Modified electrode for detecting iodate and preparation method

A technology of modifying electrodes and iodic acid, which is applied in the direction of material electrochemical variables, can solve the problems of cumbersome detection process and high detection limit, and achieve the effects of wide detection range, fast analysis speed and good stability

Inactive Publication Date: 2011-03-30
ZUNYI NORMAL COLLEGE
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  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, the determination methods of iodate ions generally include oxidation fading photometry, fluorescence quenching method, oscillometric voltammetry and mercury film electrode method, etc., but the detection process is relatively cumbersome and the detection limit is high.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0010] Glassy carbon electrodes were polished with 1800#, 2000#, and 4000# metallographic sandpaper, and then respectively washed with acetone, ethanol, 10% NaOH solution, and 1:1 HNO 3 solution, washed with double distilled water, and dried for later use. The glassy carbon electrode was charged at 50mV·S -1 Sweep rate at 0.5mol / LH 2 SO 4 Scan between -0.2V-1.2V until stable, then dry. The multi-walled carbon nanotubes were heated to 120° C. and refluxed for 14 hours with concentrated nitric acid, filtered with suction, and washed until neutral. Weigh 0.1 mg of multi-walled carbon nanotubes and 0.2 mg of phosphomolybdic acid into a beaker, add 100 mL of double distilled water, and ultrasonically disperse for 5 h. The treated glassy carbon electrode was placed in the suspension, and the -1 The scanning speed is between -0.2V-0.8V for 12 circles, washed with twice distilled water, and the multi-walled carbon nanotube and phosphomolybdic acid electrode of the present inventi...

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PUM

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Abstract

The invention discloses a modified electrode for detecting iodate and a preparation method. The preparation method comprises the following steps of using a piece of metallographic sand paper to polish a glassy carbon electrode, cleaning respectively with acetone, ethanol, a NaOH solution, an HNO3 solution and secondary distilled water, and drying; scanning the glassy carbon electrode in 0.5mol / L H2SO4 between the voltage of 0.2V below 0.2V and 1.2V to stably drying with a scanning speed of 50mV.S<-1>; and heating a multi-wall carbon nano-tube to 120 DEG C with concentrated nitric acid, refluxing for 14h, pumping, filtering, washing to be in a neutral state, arranging the glassy carbon electrode in a suspension to obtain a repeated voltammetric signal, and washing with the secondary distilled water to make a load phospho-molybdic acid modified electrode of the multi-wall carbon nano-tube. The load phospho-molybdic acid modified electrode is arranged into iodate ion solutions with different concentrations, an acetate-sodium acetate buffer solution is added, and the concentration of iodate ions is calculated. The invention has the advantages of simpleness, rapidness and good stability of the electrode. Analysis and detection of the iodate by using the modified electrode have the advantages of rapid analysis speed, wide detection range and good repeatability.

Description

technical field [0001] The invention relates to a modified electrode for detecting iodate and a preparation method thereof, in particular to a preparation method of a multi-walled carbon nanotube loaded phosphomolybdic acid modified electrode and an electrochemical method for analyzing and detecting the concentration of iodate. Background technique [0002] Iodine is a physiologically active trace element necessary for human beings. It plays an important role in the growth and intellectual development of the human body. When it is deficient, it will affect the metabolism of the body, endanger the development of infants and the brain function of adults, and cause goiter and endemic cretinism in severe cases. my country is one of the most serious countries for iodine deficiency disorders. At present, in order to prevent iodine deficiency, the state stipulates that potassium iodate should be added to table salt. Moreover, potassium iodate is a trace active ingredient widely use...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
Inventor 伍远辉罗宿星勾华
Owner ZUNYI NORMAL COLLEGE
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