Method for rapid and visual paper sensing detection of heavy metal silver ions

A silver ion and sensor paper technology, applied in the field of heavy metal detection, can solve the problems of expensive equipment, inconvenient on-site detection, complicated operation, etc., and achieve the effects of low cost, fast on-site detection, high sensitivity and selectivity

Active Publication Date: 2019-05-10
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of them require expensive equipment and complicated operations
And it can only be operated by well-trained professionals, and it is inconvenient to carry out on-site inspection

Method used

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  • Method for rapid and visual paper sensing detection of heavy metal silver ions
  • Method for rapid and visual paper sensing detection of heavy metal silver ions
  • Method for rapid and visual paper sensing detection of heavy metal silver ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The method for detecting pure silver ion solution based on nano gold-nano porphyrin composite paper sensing substrate, comprising steps:

[0039] (1) Preparation of gold nanoparticles:

[0040] Put 100ml of ultrapure water in a 250ml beaker, then add 1ml of 1% chloroauric acid, and then add 2ml of 1% sodium citrate. After mixing, put it in the microwave oven at 750W for 5 minutes. Take it out and cool it away from light, transfer it into a 100ml volumetric flask, and store it in the refrigerator at 4°C in the dark for later use. Red gold nanoparticles with a particle size of 23nm and a concentration of 6.92nM were obtained. Store in the refrigerator at 4°C, protected from light;

[0041] (2) Nano-porphyrin self-assembly is prepared by the following method:

[0042] Weigh 0.0020g tetrakis-(4-pyridyl) zinc porphyrin solid powder and dissolve in 10mLN,N-dimethylformamide solution to obtain a concentration of 2.9×10 -4 mol L -1 Four-(4-pyridyl) zinc porphyrin in N,N-d...

Embodiment 2

[0052] The method for detecting silver ions in a West Lake Longjing tea water sample based on a nano-gold-nano-porphyrin composite paper sensing substrate comprises steps:

[0053] (1) Synthesis of nano gold-nano porphyrin complex;

[0054] Adopt the method synthetic nanometer gold-nano porphyrin compound of step (1) in embodiment 1

[0055] (2) Synthesis of tetrakis-(4-pyridyl)zinc self-assembled porphyrin

[0056] Four-(4-pyridyl) zinc nanoporphyrin solution was synthesized by the method of step (2) in Example 1.

[0057] (3) Preparation of nano-gold-nano-porphyrin composite paper sensing substrate

[0058] The method of step (3) in Example 1 was used to prepare the nano-gold-nano-porphyrin composite paper sensor substrate.

[0059] (4) Preparation of silver ion West Lake Longjing tea water sample solution

[0060] Soak Duyun hair tip at 80°C for 10 minutes, dilute the filtrate 10 times as a solvent to prepare different concentrations of silver ions

[0061] (5) Making ...

Embodiment 3

[0070] The method for detecting silver ions in a tap water sample based on a nano-gold-nano-porphyrin composite paper sensing substrate, comprising steps:

[0071] (1) Synthesis of nano gold-nano porphyrin complex;

[0072] Adopt the method synthetic nanometer gold-nano porphyrin compound of step (1) in embodiment 1

[0073] (2) Synthesis of tetrakis-(4-pyridyl)zinc self-assembled porphyrin

[0074] Four-(4-pyridyl) zinc nanoporphyrin solution was synthesized by the method of step (2) in Example 1.

[0075] (3) Preparation of nano-gold-nano-porphyrin composite paper sensing substrate

[0076] The method of step (3) in Example 1 was used to prepare the nano-gold-nano-porphyrin composite paper sensor substrate.

[0077] (4) Preparation of tap water sample solution

[0078] Using tap water as a solvent to prepare different concentrations of silver ions

[0079] (5) Make a standard color card for silver ions in tap water

[0080] Preparation solution 1: 100μM silver ion tap ...

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Abstract

The invention discloses a method for rapid and visual paper sensing detection of heavy metal silver ions, and belongs to the technical field of heavy metal detection. The method specifically comprisesthe following steps of synthesis of nano gold, synthesis of tetra-(4-pyridyl) zinc protoporphyrin self-assembly body; preparation of a nano gold and nano porphyrin composite paper sensing device substrate, manufacturing of a silver ion standard colourimetric card, and comparison of the concentration, detected by the colourimetric card, of the silver ions in a to-be-tested sample. The method for detecting the silver ions based on the nano gold and nano porphyrin composite paper sensing substrate has the characteristics of easy preparation, rapid field detection, low cost, high response speed,high sensitivity and high selectivity, and the nano gold and nano porphyrin composite paper sensing substrate has a specific reaction to the silver ions, and can be used for detection of the silver ions in complex substrate water samples.

Description

technical field [0001] The invention belongs to the technical field of heavy metal detection, and in particular relates to a method for on-site and rapid detection of heavy metal silver ions. Based on nano-gold particles, a new nano-gold-nano-porphyrin sensor is used to detect silver ions. A heavy metal silver ion sensor based on colorimetric analysis was successfully constructed to realize rapid and on-site detection of silver ions. Background technique [0002] Among biologically important metal ions, Ag + It has long received attention due to its antibacterial and toxic activities. Silver is a very common coin that has been used for various applications in electronics, catalysis, spectroscopy and biomedical research. In addition to the various applications of silver, Ag + Negative effects on the environment, especially on living organisms, have also attracted considerable attention. It is reported that Ag + Can bind to amines, imidazoles, adenylate groups of various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 付海燕郭晓明佘远斌
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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