Electrochemical detection method and detector of nitro phenolic pollutants

Abstract

The invention discloses an electrochemical detection method and a detector of the nitro phenolic pollutants, wherein, the electrochemical detection method comprises the following steps: 1) sampling and introducing the samples into a sample cell which is filled with working electrodes, auxiliary electrodes and reference electrodes, and introducing nitrogen to remove oxygen; 2) applying the triangular wave voltage on the working electrodes through an electrochemical analyzer to ensure that current signals can be generated on the working electrodes; 3) transmitting the current signals to a computer through the electrochemical analyzer to convert into digital signals, showing that obvious electrochemical oxidation and reduction peaks exist in certain electric potentials, and the electrochemical oxidation and reduction peaks grow with the increase of the concentration of paranitrophenol; and 4) carrying out the linear regression method respectively on the areas of the oxidation peak and the reduction peak and on the concentration of the paranitrophenol, and calculating the concentration of the paranitrophenol according to the regression equation. The invention adopts an electrochemical sensor which takes nanoporous gold as electrodes, having the characteristics of real-time online detection, high sensitivity and high selectivity, simple operation, convenient maintenance and low detection cost.

Description

technical field [0001] The invention relates to a method for electrochemically detecting nitrophenols in environmental pollution by using a nanoporous gold electrode sensor detector, belonging to the technical field of detection of water environment pollutants. Background technique [0002] Nitrophenol compounds are toxic organic compounds that are difficult to degrade and are widely used in the production of pesticides, medicines, dyes, explosives and rubber industries, among which 4-nitrophenol, 2-nitrophenol and 2,4-dinitrophenol Due to its high toxicity, it is listed as "Priority Control Pollutant List" by the US Environmental Protection Agency (EPA). [0003] The detection of nitrophenol-containing wastewater has become the focus of environmental monitoring research, and photometry and chromatography are more commonly used methods today. Determination of phenol in water by spectrophotometry mainly adopts 4-aminoaminotipyrine-direct spectrophotometry. The disadvantage o...

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Problems solved by technology

Determination of phenol in water by spectrophotometry mainly adopts 4-aminoaminotipyrine-direct spectrophotometry. The disadvantage of this method is that the reagents used are not stable. The base prevents the color reaction, and its selectivity is poor, susceptible to interference, and it is difficult to detect various isomers separately; chromatography is a widely used testing method in recent years. Although it has high sensitivity, it is complicated to operate and sample pretreatment It is cumbersome, and the detection cost is high, and the shortcomings of not being able to detect online in real time

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