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Electrochemical gaging method for content of metal vanadium in crude oil

A determination method and electrochemical technology, applied in the petroleum field, can solve the problems of long enrichment time, poisoning, application limitation, etc., and achieve the effects of good selectivity, cheap analytical instruments and high sensitivity

Inactive Publication Date: 2012-11-14
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has been used in the determination of vanadium content in various samples, such as the determination of vanadium in water samples by vanadium (V)-alizarin red (ARS)-bromate system, vanadium (V)-4-(2-pyridine Nitrogen)-resorcinol (PAR)-bromate system for the determination of vanadium in water samples, hair samples and ore samples, vanadium (V)-chlororanic acid (CAA)-bromate system for the determination of water samples and fuel oil Vanadium (V), etc., however, because the mercury working electrode that is harmful to the environment is used in the above systems, its application is limited
In order to replace mercury electrodes, bismuth film electrodes have been used in vanadium(V)-CAA-bromate system, carbon paste electrodes and carbon nanotube modified glassy carbon electrodes have been used in vanadium(V)-ARS system to determine the vanadium content in water samples , however, the determination of vanadium (V) in these systems requires a long enrichment time

Method used

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  • Electrochemical gaging method for content of metal vanadium in crude oil
  • Electrochemical gaging method for content of metal vanadium in crude oil
  • Electrochemical gaging method for content of metal vanadium in crude oil

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the drawings.

[0024] The water used in the experiment was double distilled water, and the reagents used in the experiment included ammonium metavanadate (NH 4 VO 3 ), 4-(2-pyridylazo)-resorcinol (PAR), potassium bromate (KBrO 3 ), sulfuric acid (H 2 SO 4 ), etc. are analytical grade.

[0025] Step 1. The diameter is 10-20nm, the length is 1-2μm, and the purity is> 95% of the carbon nanotubes and liquid paraffin are mixed in a mortar with a mass ratio of 3:2, grind into a uniform paste, fill in a plastic tube with a diameter of 1.6mm, compact it, and use copper wire to lead as a wire to obtain carbon nanotubes Tube paste electrode MWCNT-PE, grind and polish the surface of MWCNT-PE on weighing paper, and store at room temperature;

[0026] Step 2. Use MWCNT-PE as a working electrode, a saturated calomel electrode as a reference electrode, and a platinum wire electrode as a counter electrode to form a t...

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Abstract

The invention discloses an electrochemical gaging method for the content of metal vanadium in crude oil. According to the electrochemical gaging method, a carbon nano tube (CNT) paste electrode is adopted as a working electrode, H2SO4 (sulfuric acid) with pH value being 2.70 and containing 4-(2-pyridine azo)-resorcinol (PAR) and potassium bromate (KBrO3) is adopted as a base solution, a cyclic voltammetry or a linear sweep voltammetry is adopted to measure the content of vanadium in the crude oil and a crude oil sample is prepared into a sample solution after being oxidized and burned at high temperature; due to the strong adsorptive capacity of CNT, the sample does not need to be conducted for preenrichment while electrochemically gaging; according to the electrochemical gaging method, a complex is generated by the ions of the metal vanadium (V) and PAR at first, the catalytic reduction waves are produced on a surface of the CNT paste electrode by the complex in the presence of KBrO3, so that the measuring sensibility is improved; and the method has the advantages of high sensibility, good selectivity, fast analysis speed and cheap price of instruments and equipments.

Description

Technical field [0001] The invention relates to an analysis and determination technology in the petroleum field, in particular to an electrochemical determination method of the metal vanadium content in crude oil. Background technique [0002] The metallic vanadium contained in crude oil is very harmful to petroleum processing. It can affect the activity of catalysts and can also corrode oil refining equipment. The harmful vanadium compounds produced when burning crude oil products can also cause environmental pollution and endanger human health. In addition, the vanadium content in crude oil can provide information such as the source, migration and type of crude oil to infer the source of illegal emissions. Therefore, the determination of vanadium content in crude oil has practical significance. The current methods for determining the vanadium content in crude oil mainly include photochemical methods such as X-ray fluorescence spectrometry, catalytic spectroscopy, inductively ...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 郑莉
Owner XI'AN PETROLEUM UNIVERSITY
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