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Preparation method of ion selective electrode capable of measuring trace chromium (III)

An ion-selective and electrode technology, applied in the field of determination of chromium content in wastewater, can solve the problems of cumbersome operation and difficulty in wide application, etc.

Inactive Publication Date: 2012-07-25
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The detection methods of chromium-containing wastewater include chemical method, physical chemical method, electrolysis method, ion exchange method, etc. These methods need to undergo a series of complicated pretreatments before measurement, and the operation is cumbersome, so it is difficult to be widely used

Method used

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  • Preparation method of ion selective electrode capable of measuring trace chromium (III)
  • Preparation method of ion selective electrode capable of measuring trace chromium (III)
  • Preparation method of ion selective electrode capable of measuring trace chromium (III)

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Experimental program
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Embodiment

[0022] (1) Synthesis of o-vanillin acetal -4-aminoantipyrine:

[0023] Weigh 3.04g of o-vanillin into a 250mL three-neck flask, add 60mL of ethanol, heat to reflux until the solid dissolves, dissolve 4.06g of 4-aminoantipyrine in 60mL of ethanol, and add this solution dropwise to the above-mentioned o-vanillin solution , heated to reflux for 1 hour, bright yellow crystals precipitated, cooled, filtered with suction, collected the solid, and recrystallized with ethanol for 2 to 3 times to obtain the target product o-vanillin-4-aminoantipyrine Schiff base ( figure 1 )5.12g, yield 72.11%.

[0024] Compare the infrared spectra of 4-aminoantipyrine and o-vanillin-4-aminoantipyrine ( figure 2 ), found that vN-H (3327cm -1 、3432cm -1 ) of the two characteristic absorption peaks disappeared in o-vanillin acetal-4-aminoantipyrine, and vC=N characteristic absorption peak 1600cm appeared -1 , indicating the formation of a new product Schiff base.

[0025] (2) Preparation of solid...

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Abstract

The invention discloses a preparation method of ion selective electrode capable of measuring trace chromium (III). Schiff base derived from o-vanillin and 4-aminoatipyrine is synthesized by o-vanillin and 4-aminoatipyrine and used as neutral carrier and mixed with carbon powder and liquid paraffin is used as adhesive, therefore the chromium (III) ion selective electrode with Nernst response is prepared. The Nernst response concentration range of the ion electrode to Cr 3+ is 1.00*10-6-1.00*10-2 mol / L at room temperature and gradient is 19.40 mV / dec, the detection lower-limit is 1.58*10-7 mol / L. The response time of electrode is less than 45s, the p H application range is 3.3-5.6, with good stability and long service life. The ion electrode has good selectivity to Cr 3+. The ion electrode is used for measuring the Cr 3+ in industry waste water.

Description

technical field [0001] The invention relates to an ion-selective electrode for rapidly measuring trace amounts of chromium (III), which can be used for determining the content of chromium (III) in waste water. Background technique [0002] Chromium is a common pollutant in water bodies in my country, and it is very harmful to crops and microorganisms. The detection methods of chromium-containing wastewater include chemical method, physical chemical method, electrolysis method, ion exchange method, etc. These methods need to go through a series of complicated pretreatments before determination, and the operation is cumbersome, so it is difficult to be widely used. As one of the important means of information transformation, the chemical sensor is a measuring device that converts the chemical information of the measured and controlled object into an electrical signal with a definite corresponding relationship to meet the requirements of information transmission, processing, tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333C07D231/46
Inventor 魏小平崔普选李建平
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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