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Method for improving detection accuracy of electrochemical active metal ions

A metal ion and detection method technology, which is applied in the field of improving the detection accuracy of electrochemically active metal ions, can solve the problems of large repeatability, difficult to achieve high consistency, and long processing time, so as to speed up the analysis speed. , The effect of reducing the loss of reagents and the number of analyses

Inactive Publication Date: 2011-01-26
INTEC PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, these two traditional methods all have the problem of long processing time
[0004] Although the use of disposable electrodes is convenient for operators, its repeatability is greatly affected by the electrode preparation process
The instability of the electrode preparation process will inevitably make the surface of the disposable electrode difficult to achieve a high degree of consistency, which will eventually affect the repeatability of electrochemical analysis
In this case, it is difficult to accurately determine the concentration of the substance to be detected in the sample, especially when the concentration of the substance to be detected is very low, which seriously affects the detection precision

Method used

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  • Method for improving detection accuracy of electrochemical active metal ions
  • Method for improving detection accuracy of electrochemical active metal ions
  • Method for improving detection accuracy of electrochemical active metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: detect the lead ion in the water sample

[0031] Using the above-mentioned standard addition method, prepare a water sample that has been determined to contain a trace amount of lead nitrate (2.5 μM) as the solution to be tested. The detection base solution is 0.2M acetate buffer solution (pH=3.4) containing 10 μg / L mercuric nitrate. The water sample is used as the detection object, and the water body polluted by heavy metal ions is actually detected according to the method of the present invention.

[0032] Take an appropriate amount (about 50 μl) of the sample to be tested, mix it with an equal volume of the detection base solution, use a pipette to absorb 50 μl of the mixed solution, and drop it on the surface of the screen-printed electrode for detection (detection parameters: constant potential is -1.2 V; detection time is 100 seconds).

[0033] Correction of detection results: add a standard substance (internal standard ion) of known concentration ...

Embodiment 2

[0036] Embodiment 2: detect the copper ion in the water sample

[0037] Using the detection method described in the present invention, first prepare a water sample determined to contain a small amount of copper acetate (0.5 μM) as the solution to be tested. The detection base solution is 0.2M acetate buffer solution (pH=3.4) containing 10 μg / L mercuric nitrate. This aqueous solution is used as the detection object.

[0038] Take an appropriate amount (about 50 μl) of the sample to be tested, mix it with the same volume of the detection base solution, use a pipette to absorb 50 μl of the resulting mixed solution, and drop it on the surface of the screen-printed electrode for detection (the detection parameter is: a constant potential of -1.0 V; detection time is 100 seconds).

[0039] Correction of detection results: add a standard substance (internal standard ion) of known concentration (Amol / L), the detected concentration is B mol / L, and the detection concentration of the sub...

Embodiment 3

[0041] Embodiment 3: detect the cadmium ion in the water sample

[0042] Using the detection method described in the present invention, a water sample determined to contain a trace amount of cadmium acetate (1 μM) is prepared in advance as the solution to be tested. The detection base solution is 0.2M acetate buffer solution (pH=3.4) containing 10 μg / L mercuric nitrate. Take this water sample as the detection object.

[0043] Take an appropriate amount (about 50 μl) of the sample to be tested, mix it with an equal volume of the detection base solution, use a pipette to absorb 50 μl of the mixed solution, and drop it on the surface of the screen-printed electrode for detection (detection parameters: constant potential is -1.3V; The detection time is 100 seconds).

[0044] Correction of detection results: add a standard substance (internal standard ion) with a known concentration (Amol / L), and the detected concentration is B mol / L; the detection concentration of the substance ...

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Abstract

The invention relates to the improvement of a cathodic stripping voltammetric method, in particular to a method for normatively adding another kind of internal standard metal ions with electrical activity into a reaction system to eliminate the influence on a detection result due to factors such as the non-uniformity of charges on the surface of a screen electrode, and the like and correct data obtained for detecting the concentration of metal ions by a voltammetric detection method so as to improve the accuracy of a detection result of an anodic stripping voltammetric method.

Description

field of invention [0001] The present invention relates to the improvement of the electrochemical analysis method, especially relates to in the reaction system, the standard adds another kind of internal standard metal ion with electroactivity, to correct the data obtained by detecting the metal ion concentration by voltammetry, thereby improving the anode The accuracy of stripping voltammetry test results. Background of the invention [0002] In electrochemical analysis, the experimental results are often easily interfered by many factors, including the cleanliness of the electrode surface and whether the test sample is contaminated by impurities. In particular, the surface smoothness, surface area, and surface charge state of the working electrode often have a great impact on the accuracy and reproducibility of electrochemical analysis results. Therefore, strict pretreatment is required for the electrodes used to ensure the accuracy and reliability of the experimental res...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 肖江群王保丹王公群汪大明
Owner INTEC PROD INC
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