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Electrochemical online cleaning method for working electrode of heavy metal online monitor
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A technology of working electrodes and heavy metals, which is applied in the field of electrochemical cleaning, can solve the problems of oxidation state interference, poor reproducibility of working electrodes of heavy metal automatic online monitors, restricting the development and application of instruments, and achieve good electrode reproducibility and breakthrough research and development The effect of restriction
Active Publication Date: 2016-02-10
QINGDAO JIAMING MEASUREMENT & CONTROL TECH
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However, the reproducibility of the working electrode used in the heavy metal automatic on-line monitor based on anodic stripping voltammetry is very poor, which seriously restricts the development and application of the instrument
At present, the working electrode used in the heavy metal automatic on-line monitor based on anodic stripping voltammetry is mainly cleaned by constant potential, and a constant potential is applied to the electrode to oxidize and dissolve impurities on the electrode. Most of the impurities are washed down, but new oxidation state interference will be formed on the electrode surface
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[0035] Select an electroplating factory as the experimental site, take 5 copies of the same waste water, numbered 1, 2, 3, 4, 5# respectively, after appropriate pretreatment, and then use it.
[0036] Take 1# waste water, use the heavy metal online monitor based on anodic stripping voltammetry, set the parameters, inject samples for measurement, after the measurement is completed, if figure 1 As shown, the parameters used for electrochemical cleaning are set: Potential V1 for positive potential cleaning = 0.3V, potential for negative potential cleaning V2 = -0.3V, initial potential V3 = 0V, duration of positive potential cleaning PT = 60ms, negative potential cleaning lasts The time NT=10ms, the recovery duration of the initial potential DT=30ms, and the cleaning time is 60s, that is, the number of cycles is 600 times. After setting the parameters, start...
Embodiment 2
[0037] Example 2: Multiple determinations of the same water sample of arsenic-containing wastewater in industrial wastewater
[0038] Take 5 parts of the same arsenic-containing wastewater, respectively numbered 1, 2, 3, 4, 5#, after proper pretreatment, stand by.
[0039] Take 1# waste water, use the heavy metal online monitor based on anodic stripping voltammetry, set the parameters, inject samples for measurement, after the measurement is completed, if figure 2 As shown, set the parameters used for electrochemical cleaning: the potential V1 for positive potential cleaning = 1.0V, the potential V2 for negative potential cleaning = -0.5V, the initial potential V3 = 0V, the duration of positive potential cleaning PT = 70ms, and the duration of negative potential cleaning The time NT=5ms, the recovery duration of the initial potential DT=25ms, and the cleaning time is 100s, that is, the number of cycles is 1000 times. After setting the parameters, start to clean the working e...
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Abstract
The invention relates to an electrochemistry on-line cleaning method for a heavy metal on-line monitor working electrode based on anodic stripping voltammetry. Each cleaning cycle internally comprises three steps of positive electric potential cleaning, negative electric potential cleaning and initial electric potentialrecovery for a working electrode, wherein the electric potential (V1) of the positive electric potential cleaning is a positive value; the electric potential (V2) of the negative electric potential cleaning is a negative value; and the initial electric potential (V3) is between the (V1) and the (V2). The electrochemistry cleaning method provided by the invention can clean the working electrode surface fully, the good electrode importance is ensured, the on-line cleaning of the working electrode is realized, and the research and development restriction of the heavy metal automatic on-line monitor based on the anodic stripping voltammetry is broken through.
Description
technical field [0001] The invention relates to an electrochemical cleaning method, in particular to an electrochemical online cleaning method for a working electrode of a heavy metal online monitor based on anodic stripping voltammetry. Background technique [0002] In recent years, heavy metal pollution incidents have occurred frequently. Since 2009, more than 30 major heavy metal pollution incidents have occurred in China. Facing the high incidence of heavy metal pollution, the Chinese government has officially put the control of heavy metal pollution on the agenda. The country will also increase investment in related testing and monitoring instruments. Therefore, in recent years, my country's heavy metal pollution detection and monitoring instruments are growing rapidly. [0003] At present, most domestic heavy metal automatic on-line monitors use spectrophotometry, which is a low-cost, relatively mature chemical analysis method and relatively easy to implement. Howeve...
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