Method for detecting trace trivalent arsenic through two-signal anodic stripping voltammetry

An anode stripping voltammetry and trivalent arsenic technology, which is applied in the field of electrochemistry, can solve the problem of large errors, no high-sweep-speed linear sweep voltammetry and high-sweep-rate cyclic voltammetry, and the accuracy of detection results is not high, etc. problems, to achieve the effect of convenient operation, satisfactory detection results, and enhanced detection flexibility

Inactive Publication Date: 2012-07-11
HUNAN NORMAL UNIVERSITY
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Problems solved by technology

The current anodic stripping voltammetry mainly uses nano-gold modified glassy carbon electrode, platinum nanoparticle-modified glassy carbon electrode and gold nanoparticle-modified indium tin oxide (ITO) electrode as working electrodes; saturated calomel electrode as reference Specific electrode, using low scan rate linear sweep voltammetry, square wave pulse voltammetry or differ

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  • Method for detecting trace trivalent arsenic through two-signal anodic stripping voltammetry
  • Method for detecting trace trivalent arsenic through two-signal anodic stripping voltammetry
  • Method for detecting trace trivalent arsenic through two-signal anodic stripping voltammetry

Examples

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Embodiment 1

[0021] Example 1: High-sweep cyclic voltammetry detection laboratory As (Ⅲ) standard sample

[0022] Standard sample preparation: prepare 0.1 mol L -1 Trivalent arsenic, dilute this solution to 0.01, 0.1, 1 and 10 mmol·L when using -1 . Prepare 0.1 mol L with ultrapure water -1 sulfuric acid solution.

[0023] Sample determination: detection by dual-signal anodic stripping voltammetry. (1) Using a three-electrode system, thoroughly clean the gold electrode used as the working electrode, the saturated calomel electrode used as the reference electrode, the platinum disk electrode used as the counter electrode, the plastic beaker, and the magnetic stirrer with water. (2) Connect the line, fix the position of the beaker, electrodes and magnetic stirrer, add 10 mL of 0.1 mol·L -1 Sulfuric acid, for electrochemical studies. (3) Using cyclic voltammetry, a blank test was performed first, and then a certain concentration of standard As(Ⅲ) solution was added to the solution to en...

Embodiment 2

[0025] Embodiment 2: High-scan rate linear sweep voltammetry detection laboratory As(Ⅲ) standard sample

[0026] Standard sample preparation: similar to Example 1. The difference is that 0.5 mol L was prepared with ultrapure water -1 Sulfuric acid solution was detected by high-speed linear sweep voltammetry.

[0027] Sample determination: detection by dual-signal anodic stripping voltammetry. Step 1 is similar to Example 1; add 10 mL of 0.5 mol L in step 2 -1 Sulfuric acid, for electrochemical studies. (3) Using high-speed linear sweep voltammetry, first conduct a blank test, then add a certain concentration of standard As(Ⅲ) solution to the solution, and enrich for 400 s at -0.2 V vs SCE potential (the first 390 s solution stirring, and the solution was left to stand for the last 10 s), and then scanned forward to 1.5 V at a scan rate of 10 V / s, so that the enriched As(0) was electrooxidized and stripped into As(Ⅲ), As(Ⅲ) for further electro-oxidation Oxidize to As(Ⅴ), r...

Embodiment 3

[0029] Embodiment 3: square wave voltammetry detection laboratory As (Ⅲ) standard sample

[0030] Standard sample preparation: similar to Example 1, using ultrapure water to prepare 0.5 mol L -1 Sulfuric acid solution is detected by square wave voltammetry.

[0031]Sample determination: detection by dual-signal anodic stripping voltammetry. Steps 1 and 2 are similar to those in Example 1; (3) Using square wave voltammetry, first conduct a blank test, and then add a certain concentration of standard As(Ⅲ) solution to the solution to enrich the concentration at -0.2 V vs SCE potential Set for 400 s (the solution was stirred for the first 390 s, and the solution was left standing for the last 10 s), and then scanned forward to 1.1 V to electrooxidize the enriched As(0) into As(Ⅲ) and As(Ⅲ) for further electrooxidation into As(Ⅴ), record the double response signal of oxidation current.

[0032] Analysis of assay results: combined image 3 For discussion, the oxidation peak pot...

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Abstract

The invention relates to a method for detecting trace trivalent arsenic through two-signal anodic stripping voltammetry, wherein a working electrode is a gold electrode, a reference electrode is a saturated calomel electrode (SCE) or a silver/silver chloride electrode; and a counter electrode is a platinum, carbon or gold inert electrode; supporting electrolyte solution includes neutral phosphate buffer solution, B-R buffer solution with pH 1.81 to 8.95, or sulphuric acid solution with 0.1 to 0.5 mol.L-1; under the negative potential (-1.1 to -0.1 VvsSCE), test solution is mixed for enrichment for 300 to 600s, so that As (III) is reduced to As (0) to be enriched to the surface of the working electrode; the solution is on standing for 10 to 20s; when forward scanning reaches a certain electric potential point between 1 to 1.6 VvsSCE, the enriched As (0) is electro-oxidized and stripped into the As (III), and the As (III) is further electro-oxidized into As (V); and the trivalent arsenic in the test solution is calculated by the prior art according to the oxidation current double-response signals generated through detection. The method has more accurate detection result, high sensitivity, better property for resisting interference of materials as copper ion, obtains satisfactory result by being applied to the sample detection, is simple and quick, and can be widely applied in fields as environmental monitoring, food safety and bioelectrochemistry.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for detecting trace trivalent arsenic by double-signal anode stripping voltammetry. Background technique [0002] Drinking water monitoring, environmental monitoring, food monitoring, or bioelectrochemical fields all need to detect trace arsenic. At present, the rapid detection methods for trace trivalent arsenic mainly include stripping voltammetry and nano-silver-based spectrophotometry, among which Stripping voltammetry has high sensitivity, simple instrument, simple steps, rapid method, and the ability of rapid field testing; it has been used for the detection of trace arsenic [G. Forsnerg, J. W. O'Laughlin, R. G. Megargle, Anal. Chem., 1975 , 47, 1586-1592]. The current anodic stripping voltammetry mainly uses nano-gold modified glassy carbon electrode, platinum nanoparticle-modified glassy carbon electrode and gold nanoparticle-modified indium tin oxide (ITO) elect...

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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