Method for detecting thiol compounds in oil product by use of in-situ bismuth plated electrode and cyclic voltammetry

A thiol compound, cyclic voltammetry technology, applied in the direction of electrochemical variables of materials, etc., to achieve high accuracy, improve repeatability, and improve test speed.

Inactive Publication Date: 2015-04-08
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention proposes a solution to the problem of electrochemical detection of mercaptans in oil products

Method used

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  • Method for detecting thiol compounds in oil product by use of in-situ bismuth plated electrode and cyclic voltammetry
  • Method for detecting thiol compounds in oil product by use of in-situ bismuth plated electrode and cyclic voltammetry
  • Method for detecting thiol compounds in oil product by use of in-situ bismuth plated electrode and cyclic voltammetry

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Experimental program
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Effect test

Embodiment 1

[0031]Step 1: Determination of electrode system and test method: use standard three-electrode system cyclic voltammetry to detect dodecyl mercaptan. Among them, the glassy carbon electrode is the working electrode, the platinum sheet electrode is the auxiliary electrode, and the Ag / Ag + The electrode is the reference electrode. Containing 0.1mol.L -1 To the methanol solution of acetic acid-sodium acetate buffer, add 5mL 0.01mol.L -1 Bi(NO 3 ) 3 , 10% HNO 3 Aqueous solution, adjust the content of acetic acid to control the pH of the solution to 4.5. The reaction temperature is 30°C, and the stirring speed of the solution is 100r.min -1 ,Stir for 30s after stirring; select cyclic voltammetry test, initial potential -0.40V, lowest potential -1.50V, highest potential 0.45V, scan rate 20mV.s -1 , the initial scan direction is the negative direction.

[0032] Step 2: Analysis of mercaptan sensitivity response: scan the electrochemical response of the in-situ bismuth-plated e...

Embodiment 2

[0038] Step 1: Determination of electrode system and test method: use standard three-electrode system cyclic voltammetry to detect n-butyl mercaptan. Among them, the glassy carbon electrode is the working electrode, the platinum sheet electrode is the auxiliary electrode, and the Ag / Ag + The electrode is the reference electrode. Containing 0.5mol.L -1 In the methanol solution of acetic acid-sodium acetate buffer, add 8mL 0.01mol.L -1 Bi(NO 3 ) 3 , 10% HNO 3 Aqueous solution, adjust the content of acetic acid to control the pH of the solution to 4.0. The reaction electric temperature is 40°C, and the stirring speed of the solution is 300r.min -1 , the resting time after stirring is 60s; choose cyclic voltammetry test, the initial potential is -1.50V, the lowest potential is -1.50V, the highest potential is 0.45V, and the scan rate is 50mV.s -1 , the initial scan direction is the positive direction.

[0039] Step 2: Sensitive response analysis of n-butyl mercaptan: scan ...

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Abstract

The invention provides a method for detecting thiol compounds in an oil product by use of an in-situ plated bismuth-film electrode and cyclic voltammetry. A small quantity of oil product containing thiol is added to an acetic acid-sodium acetate/methanol supporting electrolyte solution containing bismuth ions, and cyclic voltammetric detection is performed by use of a tri-electrode system. Due to strong interaction between the thiol and the bismuth ions, the cyclic voltammetric curve is enabled to have one more pair of oxidation and reduction peaks. Under optimized conditions, the intensity of the oxidation peaks and the reduction peaks is directly proportional to the concentration of the thiol, and therefore, the content of the thiol compounds in the oil product can be detected quantitatively. The method is characterized in that the oil product can be directly detected without pretreatment steps such as extraction, and the thiol compounds in samples can be selectively detected.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and in particular relates to a method for rapidly and accurately detecting mercaptan compounds in oil using a bismuth film electrode. Background technique [0002] Thiol refers to a class of compounds with sulfhydryl (-SH) in the molecule, which are ubiquitous in living organisms. The small amount of mercaptans remaining in the formation process of fossil fuels increases the sulfur content in petroleum products and becomes SO in the air. 2 major cause of pollution. Countries around the world are strictly controlling the sulfur content in refined oil. In order to efficiently remove sulfur during the refining process, it is necessary to understand the type and content of alkyl mercaptans, and then adjust the desulfurization process in a targeted manner. However, the reported methods for the selective detection of thiols include gas chromatography and high performance liquid chrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 陈咏梅孔丹丹万平玉
Owner BEIJING UNIV OF CHEM TECH
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