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Ph colorimetric detection analysis method based on pyrromethene derivative

A pyrromethene and analysis method technology, which is applied in the field of pH colorimetric detection and analysis based on pyrromethene derivatives, can solve problems such as difficulties, and achieve the effects of fast color change, convenient operation, and large change range

Inactive Publication Date: 2012-07-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With the development of modern science and technology, especially in the fields of modern life science, environmental science and high technology, it is often difficult to measure pH with traditional glass electrodes, especially under weak acidic conditions.

Method used

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  • Ph colorimetric detection analysis method based on pyrromethene derivative
  • Ph colorimetric detection analysis method based on pyrromethene derivative
  • Ph colorimetric detection analysis method based on pyrromethene derivative

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use a pipette to draw a concentration of 1×10 -5 mol / l pyrromethene derivative 1 acetone standard detection solution 2.7 ml is placed in a cuvette, and pyrromethene derivative 1 is measured in the absence of external [H + ] in the presence of UV spectra. Then use a pipette gun to draw the concentration of 1 × 10 -5 mol / l pyrromethene derivative 1 standard detection solution 2.7 ml in multiple cuvettes, and then use a pipette gun to absorb 0.3ml of acidic sewage solution to be tested with different concentrations and add them to each cuvette (mixed solution [H + ] is the solution to be tested [H + ] one-tenth), shake to make it mix evenly, measure pyrromethene derivative 1 in different [H + ] under the UV spectrum. Titrate the pH of each different solution to be tested, convert the pH of each mixed solution, and draw the ultraviolet spectrograms of pyrromethene derivative 1 at different pH (the structural formula and ultraviolet spectrogram of pyrromethene derivat...

Embodiment 2

[0030] Use a pipette to draw a concentration of 1×10 -5 mol / l pyrromethene derivative 2 tetrahydrofuran standard detection solution 2.7 ml is placed in a cuvette, and the determination of pyrromethene derivative 2 in the absence of external [H + ] in the presence of UV spectra. Then use a pipette gun to draw the concentration of 1 × 10 -5 mol / l pyrromethene derivative 2 standard detection solution 2.7 ml in a plurality of cuvettes, and then use a pipette gun to absorb 0.3ml of acid rain samples with different concentrations to be tested and add them to each cuvette respectively (mixed solution [H + ] is the solution to be tested [H + ] one-tenth), shake to make it mix evenly, measure pyrromethene derivative 2 in different [H + ] under the UV spectrum. Titrate the pH of each different solution to be tested, convert the pH of each mixed solution, and draw the ultraviolet spectrum of pyrromethene derivative 2 at different pHs (the structural formula and ultraviolet spectru...

Embodiment 3

[0032] Use a pipette to draw a concentration of 1×10 -5The 1,4-dioxane standard detection solution 2.7 ml of the pyrromethene derivative 3 of mol / l is placed in the cuvette, and the determination of the pyrromethene derivative 3 in the absence of external [H + ] in the presence of UV spectra. Then use a pipette gun to draw the concentration of 1 × 10 -5 mol / l pyrromethene derivative 3 standard detection solution 2.7 ml in a plurality of cuvettes, and then use a pipette gun to absorb 0.3ml of acid gas collection solution with different concentrations to be tested and add them to each cuvette respectively ( [H of the mixed solution + ] is the solution to be tested [H + ] one-tenth), shake to make it mix evenly, measure pyrromethene derivative 3 in different [H + ] under the UV spectrum. Titrate the pH of each different solution to be tested, convert the pH of each mixed solution, and draw the ultraviolet spectrograms of pyrromethene derivative 3 at different pHs (the struc...

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Abstract

The invention discloses a pH colorimetric detection analysis method based on a pyrromethene derivative. The pyrromethene derivative is a detection matter and is dissolved in organic solvent to prepare standard detection solution with certain concentration. 0.3ml of different [H+] solution to be detected is added into 2.7ml of standard detection solution, ultraviolet absorption spectrums of the original standard detection solution before and after acid is added are determined, the pH of acidic solution to be detected is titrated and the corresponding relation between the ultraviolet spectrum curves of the pyrromethene derivative and the pH of the solution to be detected can be calculated through conversion. The chemical stability of the pyrromethene derivative used in the method is high, the pyrromethene derivative has a very sensitive response ability to H+ and is insensitive to the polarity of the solvent, the colorimetric detection is convenient to operate, the color change speed during colorimetric reaction is rapid, the change amplitude is great and can be seen by naked eyes and the problem that the effect of the existing pH detector is not ideal under the condition of weak acid is solved. The pH colorimetric detection analysis method based on the pyrromethene derivative can be used for monitoring acidic wastewater of chemical plants, acid rain, atmospheric acid gas, metalcorrosion and soil alkalinity or acidity.

Description

technical field [0001] The invention relates to a pH colorimetric detection and analysis method based on pyrromethene derivatives. Background technique [0002] Acid-base measurement is closely related to modern industry, agriculture, medicine, bioengineering, environment and scientific research, especially the precise measurement of pH (proton concentration) is extremely important for chemical and biological research. The traditional measurement of pH value mainly uses glass electrodes, but it is not suitable for pH monitoring in living bodies due to defects such as electrochemical interference and possible mechanical damage. [0003] For most pH sensors, a big problem is that the detection range is usually very wide, which leads to the low sensitivity of the pH sensor (up to 7-8 pH units). Many probes are also susceptible to interference from metal ions. Therefore, designing and synthesizing a pH sensor with a narrow response range, high sensitivity, and a large response...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 胡彬彬李继超胡公方吕萍王彦广
Owner ZHEJIANG UNIV
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