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Method for visually detecting cadmium ions based on silver nanoparticle

A cadmium ion, silver nanotechnology, applied in the field of analysis, can solve the problems of complex equipment, time-consuming, and cannot be widely used, and achieve the effect of sensitive detection

Inactive Publication Date: 2016-04-27
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods are accurate and highly sensitive, there are many pre-treatment steps for samples and complex instruments and equipment, which are relatively time-consuming, costly for detection, and require professional personnel to operate, making it impossible to be widely used.
At present, my country has not released the standard for the detection method of cadmium in milk, therefore, it is necessary to establish a simple, rapid and sensitive method for the detection of cadmium in milk samples

Method used

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  • Method for visually detecting cadmium ions based on silver nanoparticle
  • Method for visually detecting cadmium ions based on silver nanoparticle
  • Method for visually detecting cadmium ions based on silver nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of silver nanoparticles modified with 1-amino 2-naphthol 4-sulfonic acid

[0024] All glassware used were soaked in aqua regia, washed twice with ultrapure water, and dried at 100°C for use; 2.0mL0.01molL -1 AgNO 3 Add to 97.5mL ultrapure water, stir, add 8.8mgNaBH 4 , continue to stir and react in the dark for half an hour, then add 0.5mL of 10mM 1-amino 2-naphthol 4-sulfonic acid, continue to react for two hours at room temperature, and store at 4°C after cooling to obtain a silver nano solution;

[0025] (2) Detection of cadmium ions

[0026] Add different volumes of cadmium ions to a certain amount of silver nano-solution and leave it for 5 minutes so that the final concentrations of cadmium ions are 0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 8.0, 10 μM, and observe the color characteristics visually and the determination of the absorbance ratio A 580nm / A 390nm , it was visually observed that with the increase of the concentration of cadmium ions, the co...

Embodiment 4

[0029] (3) Pretreatment of milk powder:

[0030] First, take 2.0mL water to dissolve 0.6g sample, then add it to 1.5mL mixed solution of trichloroacetic acid with a mass concentration of 10% and 5.0mL acetonitrile, after ultrasonic vibration for 15min, move the mixed solution into a centrifuge tube, 12000rpmmin -1 Centrifuge at high speed for 15 minutes, take the supernatant and remove fat through a 0.22 μm membrane filter, adjust the pH of the filtrate to 7.0, centrifuge and filter through a 0.22 μm membrane filter again, and dilute the filtrate to 10 mL with secondary ultrapure water;

[0031] (4) The detection steps of the actual sample are as follows:

[0032] Take 20 μL sample solution and add it to the silver nano solution, observe the color change of the solution and measure the absorbance ratio A 580nm / A 390nm , to determine the sample recovery.

[0033]

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Abstract

The invention discloses a simple and rapid colormetric method for visually detecting cadmium ions in dairy products based on silver nanoparticles, belonging to the technical field of analytical chemistry. The cadmium ions can cause aggregation of 1-amino 2-naphthol 4-sulfonic acid modified silver nanoparticles, thus presenting changes in solution color and ultraviolet absorption spectrum features. According to the method disclosed by the invention, the total detection time used is shorter than 30min, the cadmium ions in the dairy products can be simply, rapidly and sensitively detected, and the method is high in sensitivity, has the detection limit of 87nM and provides convenience for subsequent research, production, supervision and the like.

Description

technical field [0001] The invention relates to a method for visually detecting cadmium ions based on silver nanometers, belonging to the technical field of analysis. Background technique [0002] Heavy metal cadmium ion is a common chemical poison in the environment, which exists in the environment in the form of divalent ions, and is the main heavy metal in water pollution. Cadmium is not a trace element necessary for human life activities. It can enter the human body through the food chain. When the human body ingests it, most of it will accumulate in the organs. If it exceeds a certain amount in the human body, it will seriously affect human health. It has carcinogenic and teratogenic properties. , mutagenic effect, will make proteins and enzymes inactive, and eventually lead to death. [0003] At present, the detection methods of cadmium mainly include inductively coupled plasma emission spectrometry, electrochemical method, atomic absorption spectrophotometry and atom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/29
CPCG01N21/33G01N21/29
Inventor 吴芳英金唯唯万益群
Owner NANCHANG UNIV