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Method for detecting silver ions

A technology of silver ions and suspensions, applied in the field of detecting silver ions, can solve problems such as restricting the development of PDA-based sensors, and achieve the effect of realizing dual fluorescence detection and analysis and low detection cost.

Active Publication Date: 2021-09-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In conclusion, the complex organic synthesis restricts the development of PDA-based sensors to some extent.

Method used

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  • Method for detecting silver ions
  • Method for detecting silver ions
  • Method for detecting silver ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of PDA vesicle suspension:

[0045] Weigh 7.5mg of 10,12-pentacosadiynoic acid and dissolve it in 10ml of ethanol to prepare a 2mmol / L ethanol solution of 10,12-pentacosadiynoic acid, and store it for later use; weigh 50mg of ethylenediamine Dissolve disodium tetraacetate powder in 100mL HEPES (20mM, pH=7.4) buffer solution under heating and stirring conditions, and prepare 1.5mmol / L disodium ethylenediaminetetraacetate aqueous solution, which is stored for later use; at room temperature under the condition of 1000rpm , take 0.5mL of 10,12-pentacosadiynoic acid ethanol solution slowly dropwise into 10mL of disodium edetate aqueous solution, and then place the obtained colorless suspension in a refrigerator at 4°C to avoid Preserve for 8 hours, take it out and irradiate it with 254nm ultraviolet light (6W, 10cm away from the sample) for 5 minutes to obtain a blue PDA vesicle suspension; figure 1 According to scanning electron microscope and transmission ...

Embodiment 2

[0052] (1) Preparation of PDA vesicle suspension:

[0053] Weigh 7.5mg of 10,12-pentacosadiynoic acid and dissolve it in 10ml of ethanol to prepare a 2mmol / L ethanol solution of 10,12-pentacosadiynoic acid and store it for later use; weigh 33.6mg of ethylenediynoic acid Dissodium ethylenediaminetetraacetic acid powder was dissolved in 100mL HEPES (20mM, pH=7.4) buffer solution under heating and stirring conditions to prepare 1mmol / L disodium ethylenediaminetetraacetic acid aqueous solution, which was stored for later use; at room temperature at 1000rpm , take 1.0mL of 10,12-pentacosadiynoic acid ethanol solution slowly dropwise into 10mL of disodium edetate aqueous solution, and then place the obtained colorless suspension in a refrigerator at 4°C to avoid Store in light for 8 hours, take it out and irradiate it with 254nm ultraviolet light (6W, 10cm away from the sample) for 10min to obtain a blue PDA vesicle suspension.

[0054] (2) Blue PDA vesicles are used for Ag + Qual...

Embodiment 3

[0057] (1) Preparation of PDA vesicle suspension:

[0058] Weigh 7.5mg of 10,12-pentacosadiynoic acid and dissolve it in 10ml of ethanol to prepare a 2mmol / L ethanol solution of 10,12-pentacosadiynoic acid and store it for later use; weigh 67.2mg of ethylenediynoic acid Dissodium ethylenediaminetetraacetic acid powder was dissolved in 100mL HEPES (20mM, pH=7.4) buffer solution under the condition of heating and stirring to prepare 2mmol / L disodium ethylenediaminetetraacetic acid aqueous solution, which was stored for later use; , take 1.5mL of 10,12-pentacosadiynoic acid ethanol solution slowly dropwise into 10mL of disodium edetate aqueous solution, and then place the obtained colorless suspension in a refrigerator at 4°C to avoid Store in light for 12 hours, take it out and irradiate it with 254nm ultraviolet light (6W, 10cm away from the sample) for 5 minutes to obtain a blue PDA vesicle suspension.

[0059] (2) Blue PDA vesicles are used for Ag + Qualitative and quantita...

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Abstract

The invention provides a method for detecting silver ions. The method specifically comprises the following steps: dropwise adding an ethanol solution of 10, 12-pentacosadiynoic acid into an aqueous solution of ethylene diamine tetraacetic acid under the condition of stirring at room temperature in a dark place by adopting a vesicle suspension liquid, and then standing the suspension liquid overnight at low temperature, so that the suspension liquid is self-assembled to obtain a colorless supramolecular suspension liquid; and then polymerizing the colorless supramolecular suspension liquid under ultraviolet radiation to obtain a blue polydiacetylene vesicle suspension liquid. Compared with other detection methods, the polydiacetylene vesicle suspension liquid designed by the invention can be used for visual detection of Ag < + > in a water environment, does not need complex biochemical modification, does not need large-scale instrument equipment and a tedious sample pretreatment process, is relatively low in detection cost, and can realize rapid real-time analysis.

Description

technical field [0001] The invention belongs to the field of chemical detection, in particular to a method for detecting silver ions. Background technique [0002] Silver and its compounds are widely used in production and life. Excessive silver will seriously endanger the ecological environment and human health. Therefore, Ag in the environment + Rapid and accurate detection is of great significance. Existing Ag + Detection methods such as spectroscopy, fluorescent probe methods, and electrochemical sensors usually require expensive instruments, dedicated operations, time-consuming sample pretreatment processes or complex design and synthesis processes, and it is difficult to achieve on-site detection. [0003] Polydiacetylene (PDA) is a kind of conjugated polymer with special optical properties. Under external stimuli, it will undergo color transition from blue to red and non-fluorescent to fluorescent. Therefore, the blue state of PDA is considered to be An ideal metal...

Claims

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Application Information

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IPC IPC(8): C08F138/00C08F2/48G01N21/31G01N21/33G01N21/64G01N21/75
CPCC08F138/00C08F2/48G01N21/31G01N21/33G01N21/643G01N21/75G01N2021/755
Inventor 朱光明郝瑜佳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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