Preparation method of modified electrodes and use of modified electrodes in determination of free copper ions in feed additive copper lysine

A technology for modifying electrodes and electrodes, applied in the direction of electrochemical variables of materials, etc., can solve the problems of difficult to measure the content of free metal ions, difficult to separate trace elements, etc., and achieve the effects of high accuracy, simple preparation method, and simple detection method.

Active Publication Date: 2015-10-28
ZHONGKAI UNIV OF AGRI & ENG +2
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Problems solved by technology

At present, the country has established standards for the determination of the chelation rate of methionine series trace element amino acid complexes (chelates), but there is no corresponding national standard for lysine (copper, zinc) series of chelates that are easily solubl

Method used

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  • Preparation method of modified electrodes and use of modified electrodes in determination of free copper ions in feed additive copper lysine
  • Preparation method of modified electrodes and use of modified electrodes in determination of free copper ions in feed additive copper lysine
  • Preparation method of modified electrodes and use of modified electrodes in determination of free copper ions in feed additive copper lysine

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preparation example Construction

[0029] A method for preparing a modified electrode, comprising the steps of:

[0030] 1) Surface treatment of the bare glassy carbon electrode;

[0031] 2) Place the electrode, counter electrode, and reference electrode obtained in the previous step in the sulfuric acid solution for cyclic scanning until the voltammogram is stable, and then activate the electrode;

[0032] 3) The three electrodes are then placed in a solution containing cysteamine chelated metals, and cyclic scanning is performed to obtain the final modified electrode.

[0033] For the above method, preferably, in step 1), the surface treatment method is: grinding, polishing, cleaning, and drying; more preferably, it is: grinding the bare glassy carbon electrode (d=3mm) on metallographic sandpaper, followed by Al with particle size of 3μm, 0.5μm, 0.03μm 2 o 3 Polish the powder into a mirror surface; then use 2mol / LNaOH, (1+1)HNO 3 , 70vol% absolute ethanol and secondary water for ultrasonic cleaning, and t...

Embodiment 1

[0043] Grind the bare glassy carbon electrode (d=3mm) on metallographic sandpaper, and use Al 2 o 3 Powder polished to a mirror finish. Use 2mol / LNaOH, (1+1)HNO respectively 3 , 70% absolute ethanol and secondary water for ultrasonic cleaning, and the treated electrode was dried at room temperature. Put the cleaned bare glassy carbon electrode, counter electrode (1cm×1cm platinum sheet electrode) and reference electrode (saturated calomel electrode) into 0.5mol / LH 2 SO 4 Carry out cyclic scanning in the range of -1.2 ~ +1.6V until the voltammogram is stable, activate the electrode, and the scanning rate is 100mV / s. Then, put the three electrodes into a 6.0×10 -3 In the 0.1mol / L potassium chloride solution of mol / L3:2 cysteamine zinc solution, in the potential range of -1.2~+1.6V, 50mV / s cyclic scanning for 30 circles, the CS-Zn / GCE modified electrode was prepared .

[0044] Representation example:

[0045] Preparation of 3:2 zinc cysteamine / GCE modified electrode...

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Abstract

The invention discloses a preparation method of modified electrodes and a use of the modified electrodes in determination of free copper ions in a feed additive copper lysine. The preparation method comprises 1, carrying out surface treatment on bare glassy carbon electrodes, 2, putting the electrode, counter electrode and reference electrode obtained by the step 1 into a sulfuric acid solution and carrying out round scanning until a voltammogram is stable so that electrode activation is realized, and 3, putting the three electrodes into a solution containing cysteamine chelated metal, and carrying out round scanning to obtain finished modified electrodes. The invention also discloses a use of the modified electrodes in detection of copper ion and copper lysine chelating rates. The preparation method is simple. The modified electrodes are used for detection of copper ion and copper lysine chelating rates and have high accuracy. The detection method is simple and is free of an expensive apparatus.

Description

technical field [0001] The invention relates to a preparation method of a modified electrode and a measurement application of free copper ions in feed additive copper lysine. Background technique [0002] Trace element amino acid chelate is a recently developed third-generation trace element feed additive. Due to its good stability, strong anti-interference, and high biological potency, it has become a hot spot in the feed industry. People in the industry often use the chelation rate of trace element amino acid to reflect the quality of trace element amino acid chelate. The determination of chelation rate has important theoretical and practical significance for animal nutrition research, preparation of trace element amino acid chelates, animal husbandry production, and market supervision. At present, the country has established standards for the determination of the chelation rate of methionine series trace element amino acid complexes (chelates), but there is no correspond...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
Inventor 舒绪刚周新华吴春丽吴信邱桂雄
Owner ZHONGKAI UNIV OF AGRI & ENG
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