Fast quantifying electrolysis method

An analysis method, electroanalysis technology, which is applied in the field of determining the concentration of the analyte by rapidly changing the potential and the amount of electron transfer in this process, which can solve the problems of slow detection speed and achieve low cost, simple operation and high analysis speed. fast effect

Active Publication Date: 2009-03-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the detection speed of the current analysis method of pollutants in water is relatively slow, and to develop a high-speed electrochemical method for detecting pollutants in water, that is, to use the narrow potential continuous step method to improve the potential step chronocoulomb method detection selectivity while maintaining a method for fast analytical characterization

Method used

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  • Fast quantifying electrolysis method

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Embodiment 1

[0019] Use the nitroreductase modified electrode as the working electrode, the platinum sheet electrode as the auxiliary electrode, and the saturated calomel electrode as the reference, take a narrow potential interval (-0.60V, -0.80V), and start from 0V to the negative potential step, the first The first step time is 3 seconds, the second step time is 3 seconds, and the third step time is 2 seconds. The pH of the solution to be tested is 7.5, the reduction peak is quantitative, and the solution does not need to be deoxygenated. This method can be used to detect nitrobenzene in water to avoid errors caused by aeration and deoxygenation. However, the oxygen reduction has been completed at the first step and will not cause interference.

Embodiment 2

[0021] Use a glassy carbon electrode as the working electrode, a platinum sheet electrode as the auxiliary electrode, and a saturated calomel electrode as the reference. Take a narrow potential range (0.51V, 0.60V), start a positive potential step from 0V, and the first step time 2 seconds, the second step time is 2 seconds, and the third step time is 2 seconds. The pH of the solution to be tested is 5.6, and the oxidation peak is quantified. This method can be used to detect the concentration of ferulic acid.

Embodiment 3

[0023] Use a glassy carbon electrode as the working electrode, pre-polarize at 2.0V for 2 minutes, then polarize at -1.0V for 1 minute, then immerse in the lead nitrate solution, activate it for 10 minutes under stirring conditions, and use it. The platinum wire electrode is the auxiliary electrode. The silver / silver chloride electrode is used as a reference, and a narrow potential interval (-0.40V, -0.55V) is taken, and the negative potential step is started from 0V, the first step time is 2 seconds, and the second step time is 3 seconds , the third step time is 2 seconds. The pH of the solution to be tested is 5.0, and the reduction peak is quantified. This method can be used to detect lead ions (Pb 2+ )concentration.

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Abstract

The invention discloses a quantitive electrochemical analysis method for fast analyzing substance concentration, which utilizes different electrode systems aiming at different substances. The method determines potential interval between reduction (or oxidization) peaks of the to-be-tested substance by the means of cyclic voltammetry; and based on the interval, the method determines the potential step intervals for three times of potential steps; current-time data is recorded during the three times of potential steps; electric quantity is obtained by integral upon the time with the current peak corresponding to the second potential step interval; the electric quantity is in linear relationship with the concentration of the to-be-detected substance, which can prove the quantitive characteristic. The invention has fast analysis speed and simple operation.

Description

field of invention [0001] The invention relates to a fast electrochemical quantitative analysis method, in particular to a method for determining the concentration of the analyte by changing the potential rapidly and using the electron transfer amount in the process. Background technique [0002] Electrochemical analysis is a method of analysis using the electrical and electrochemical properties of substances. It usually makes the sample solution to be analyzed to form a chemical battery, and then measures it according to the internal relationship between some physical quantities of the battery and its chemical quantities, which can be divided into amperometric analysis, potential analysis, and power analysis. and voltammetric analysis. At present, the widely used method of electrochemical analysis is cyclic voltammetry. This method controls the electrode potential at different rates and repeatedly scans with a triangular waveform one or more times over time. The potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 李玉平刘晨明曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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