Simple and low-cost silver ion visual quantitative detection method

A quantitative detection method and low-cost technology, applied in the field of visual quantitative detection of silver ions, can solve the problems of inability to use real-time detection, high analysis cost, bulky volume, etc., and achieve specific portable qualitative and quantitative detection. The detection process is simple and broad. The effect of the application foreground

Active Publication Date: 2017-02-22
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods based on spectrometers, mass spectrometers and electrochemical electrodes have high analysis costs, cumbersome and time-consuming analysis process, require high profess

Method used

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  • Simple and low-cost silver ion visual quantitative detection method
  • Simple and low-cost silver ion visual quantitative detection method
  • Simple and low-cost silver ion visual quantitative detection method

Examples

Experimental program
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Embodiment 1

[0018] This example uses a simple and low-cost visual quantitative detection method for silver ions to analyze 1 mM Ag containing + aqueous solution (A) and a blank sample (Ultrapure water without Ag+, B).

[0019] The specific implementation process is as follows:

[0020] Such as figure 1 As shown, the specific steps of this embodiment are: Step 1, 50 μL of 1 mM silver nitrate (AgNO 3 ) aqueous solution was added dropwise to a plastic transparent test tube with graduations on the outer wall containing 100 μL of 2.5 mM TMB solution (prepared from formamide that is miscible with water and has a density of 1.134 g / mL at 25°C); step 2, visually inspect Observe and directly read the scale on the outer wall of the transparent test tube related to the length of the blue solution in the transparent test tube, the length of which is the same as the Ag + Concentrations are positively correlated, i.e. complete Ag + visual quantitative detection.

[0021] The blank sample, i.e. ult...

Embodiment 2

[0023] In this example, a simple and low-cost visual quantitative detection method for silver ions was used to analyze Ag with a concentration range of 62.5 μM to 4 mM. + aqueous solution.

[0024] The specific implementation process is as follows:

[0025] Such as figure 1 As shown, each Ag detected in this embodiment + The specific steps of the aqueous solution are as follows: step 1, 50 μL of a certain concentration of AgNO 3 The aqueous solution was added dropwise to a plastic transparent test tube with graduations on the outer wall containing 100 μL of 2.5 mM TMB solution (prepared from formamide that is miscible with water and has a density of 1.134 g / mL at 25°C); step 2, visually observe, Directly read the scale on the outer wall of the transparent test tube relative to the length of the blue solution in the transparent test tube. All Ag + The length value of the colored solution of the aqueous solution (that is, the scale value on the outer wall of the transparent...

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Abstract

The invention discloses a simple and low-cost silver ion visual quantitative detection method. The method adopts an organic solvent which can be mutually soluble with water and has density more than 1g/mL at the temperature of 25 DEG C for dissolving 3,3',5'5'-tetramethyl benzidine (TMB). When aqueous solution containing silver ions is dropwise added into TMB solution, Ag<+> quickly oxidizes TMB to generate blue quinoid benzidine. As the adopted organic solvent can be taken as a bicolour layering intelligent regulator, a unique bicolour mixed solution which is blue at the upper layer and colourless at the lower layer is obtained finally; meanwhile, the length of the blue solution is positively correlated with concentration of Ag<+>, so that quantitative detection on Ag<+> at micromole level can be realized by visualizing and observing with naked eyes and measuring the length of the blue solution. According to the method disclosed by the invention, a Ag<+> detection process is extremely simple, an operator not trained professionally can carry out an experiment, more importantly, a quantitative signal can be read without using instrument or equipment, and on-site analysis and real-time detection on a sample can be realized while analysis cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical sensing and detection of heavy metal ions, and in particular relates to a simple and low-cost silver ion visual quantitative detection method. Background technique [0002] Silver ions (Ag + ) are widely used in photography, imaging, electrical appliances, medicine and other fields. But Ag + Ions can be enriched in the human body through the food chain. High concentrations of such heavy metal ions can destroy the activity of enzymes, and can combine with functional groups such as amines, imidazoles, and carboxyl groups of various metabolites, seriously affecting and damaging human health. even lead to death. The current traditional Ag + Quantitative detection methods mainly include atomic and ultraviolet absorption spectrometry, fluorescence spectrometry, mass spectrometry, electrochemical sensor method, ion selective electrode method, etc. However, these methods based on spectrometers, mass...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 张云聂瑾芳王慧利韦勇
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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