Double-channel anodic stripping voltammetry

An anodic stripping voltammetry, dual-channel technology, applied in the direction of material electrochemical variables, etc., to achieve satisfactory detection results, convenient operation, and high sensitivity

Inactive Publication Date: 2012-08-01
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, only one group of metals can be detected each time, and the stripping voltammetric detection of heavy metals in the pos

Method used

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  • Double-channel anodic stripping voltammetry
  • Double-channel anodic stripping voltammetry
  • Double-channel anodic stripping voltammetry

Examples

Experimental program
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Embodiment 1

[0035]This embodiment includes the following steps:

[0036] (1) Prepare 0.1 g·L -1 Cd(II), Pb(II) standard solution, when used, dilute this solution to 10 mg·L -1 , prepare 0.1 mol L with ultrapure water -1 Acetic acid buffer solution (pH 4.5), as a supporting electrolyte solution for detecting Cd(II) and Pb(II); prepare 0.1 mol L -1 As(III) standard solution, dilute this solution to 0.01 mmol·L when using -1 , 0.1 mmol·L -1 , 1 mmol·L -1 and 10 mmol·L -1 , prepare 0.5 mol·L with ultrapure water -1 Sulfuric acid solution is used as a supporting electrolyte solution for detecting As(III); of course, neutral phosphate buffer solution or BR buffer solution with a pH of 1.81 to 8.95 can also be used as a supporting electrolyte solution for detecting As(III).

[0037] (2) Channel 1 and channel 2 were detected by a three-electrode system, the working electrode of channel 1 was a glassy carbon electrode, the working electrode of channel 2 was a gold electrode, the reference e...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] (1) The preparation of Cd(II), Pb(II) standard solution and As(III) standard solution is the same as in Example 1, and 0.1 mol L is prepared with ultrapure water -1 Acetic acid buffer solution (pH 4.5) as a supporting electrolyte solution;

[0045] (2) Channel 1 and channel 2 are detected by a three-electrode system respectively. The working electrode of channel 1 is a glassy carbon electrode with pre-mercury coating, the working electrode of channel 2 is a gold electrode, and the reference electrode of channel 1 and channel 2 is saturated with calomel. Electrode (SCE), counter electrode, platinum plate electrode, wash each electrode, beaker and magnetic stirrer with water; then connect the line, fix the position of the beaker, each electrode and magnetic stirrer, and then add 10 mL of 0.1 mol ·L -1 Acetate buffer, connected to channel 1 and channel 2;

[0046] Preparation of the pre-mercury-coated glassy carbon ...

Embodiment 3

[0052] The difference between this example and Example 2 is that in step (4), first take the water sample to be tested - tap water, filter it under reduced pressure with a 0.22 mm filter membrane, add 50 μL of water sample to the supporting electrolyte solution, and then use the standard addition Law.

[0053] Analysis of measurement results: no obvious lead, cadmium and arsenic oxidation peaks in blank tap water, adding 1, 5, 10, 30, 50 and 70 ppb of Pb(II), Cd(II) (final concentration) and 0.01, 0.03 , 0.05, 0.08 and 0.1 μmol L -1 After As(III) (final concentration), the oxidation peaks of lead, cadmium and arsenic appeared, the oxidation peak potential of Cd(0) to Cd(II) was about -0.635 V vs SCE, and the oxidation peak potential of Pb(0) to Pb(II ) is about -0.465 V vs SCE, the oxidation peak potential of As(0) to As(III) is about 0.035 V vs SCE, and the oxidation peak potential of As(III) to As(Ⅴ) is about 0.695 V vs SCE, the peak currents of the oxidation peaks of the ...

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Abstract

The invention relates to double-channel anodic stripping voltammetry, which comprises the following steps of: (1) preparing a standard solution and a supporting electrolyte solution; (2) detecting a channel 1 and a channel 2 by using a three-electrode system; (3) adjusting the potential of a working electrode of the channel 1 to be -1.4 to -1.0 V vs saturated calomel electrode (SCE), adjusting the potential of a working electrode of the channel 2 to be -0.8 to -0.1V vs SCE, enriching at the stirring rate of 350 to 450rpm for 290 to 590s, stopping stirring, and standing for 10 to 30s; and scanning the potential of the channel 1 forwards until the potential is -0.3 to 0V vs SCE, scanning the potential of the channel 2 forwards until the potential is 1.3 to 1.6V vs SCE, and thus acquiring oxidation current response signals; and (4) adding a solution to be detected, and detecting by a standard addition method. By the double-channel anodic stripping voltammetry, trace lead, cadmium and trivalent arsenic can be detected simultaneously, and a detection effect is good.

Description

technical field [0001] The invention relates to an anode stripping voltammetry, in particular to a dual-channel anode stripping voltammetry for simultaneously detecting trace amounts of lead, cadmium and trivalent arsenic. Background technique [0002] Trace amounts of lead, cadmium and trivalent arsenic are to be detected in areas such as drinking water monitoring, environmental monitoring, food monitoring or bioelectrochemistry. At present, the detection of lead and cadmium mainly adopts atomic absorption spectrometry, inductively coupled plasma method or stripping voltammetry, and stripping voltammetry can use mercury film or bismuth film modified glassy carbon electrode as a highly sensitive working electrode[J .Wang, J.Lu, S.B.Hocevar, P.A.M.Farias, B.Ogorevc, Anal. Chem., 2000, 72, 3218-3222], has been widely used in the detection of lead and cadmium. The rapid detection methods for trace trivalent arsenic mainly include stripping voltammetry and nano-silver-based spe...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 谢青季部丽娟谷铁安黄素清傅迎春马铭
Owner HUNAN NORMAL UNIVERSITY
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