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Nanogold colorimetric method for detecting mercury ions

A nano-gold colorimetric method and mercury ion technology, which is applied in the field of analytical chemistry, can solve the problems that are not conducive to popularization and application, low salinity resistance, and unfavorable environmental sample detection, etc., and achieve strong scalability, low dosage, less toxic effect

Active Publication Date: 2013-02-27
南京广全环保技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the salt tolerance of the above method is not high, which is not conducive to the detection of environmental samples and is not conducive to popularization and application.

Method used

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  • Nanogold colorimetric method for detecting mercury ions
  • Nanogold colorimetric method for detecting mercury ions
  • Nanogold colorimetric method for detecting mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of gold nanoparticles

[0034] Nanogold was prepared by reducing chloroauric acid with sodium citrate (see the transmission electron micrograph for the figure 1 ). First, all glassware needs to be soaked in aqua regia to remove residual reducing substances in the glass container. Accurately weigh HAuCl 4 .4H 2 O 0.0123 g in a 250 mL three-necked flask, and then add 100 mL of water to the three-necked flask. Stir vigorously, heat to boil and reflux. Accurately weigh 0.2849 g of sodium citrate dihydrate into a 25 mL volumetric flask. Take a certain amount of sodium citrate solution, heat it in a water bath to 70 °C and quickly add it to the flask. After 15 minutes, the solution turned from colorless to purple-gray and finally wine red. Heating was continued for 10 minutes, and then heating was stopped. Stirring was continued for 10 minutes and then cooled to room temperature. The size of gold nanoparticles is related to the amount of sodium citrate ...

Embodiment 2

[0045] Compared with Example 1, the difference is only in that different concentrations of divalent mercury ions are added to the 13 nm nano-gold solution modified by mercaptoethylamine, and the ultraviolet-visible spectrum measured after 20 min; the concentration of mercury ions is as follows: ( a) 0 μmol / L; (b) 1 μmol / L; (c) 2 μmol / L; (d) 5 μmol / L; (e) 7 μmol / L; (f) 8 μmol / L; 9 μmol / L; (h) 10 μmol / L; (i) 25 μmol / L (j) 50 μmol / L; (k) 100 μmol / L;

[0046] Figure 5 based on Figure 4 Draw the standard curve for mercury ions.

Embodiment 3

[0048] Compared with Embodiment 1, the only difference is that in this embodiment:

[0049] (1) Using sodium citrate to reduce chloroauric acid to prepare wine-red nano-gold solution, the concentration of nano-gold is 1.8 nmol / L, and the particle size of nano-gold is 11 nm;

[0050] (2) Add 9 mmol / L mercaptoethylamine solution to the nano-gold solution obtained in step (1) to modify the nano-gold; wherein, the molar ratio of mercaptoethylamine to nano-gold in the mercaptoethylamine solution is 40:1 , the modification time is 15 hours;

[0051] (3) Add buffer solution to the modified nano gold solution to adjust the pH, and adjust the pH value to 7 to facilitate the formation of N-Hg 2+ -N structure; the buffer is 0.18 mol / L phosphate buffer solution.

[0052] (4) Add the mercury ion solution to be tested to the nano-gold solution obtained in step (3), mix well, and detect the UV-visible spectrum of the solution after 15 minutes to obtain the UV-visible spectrum correspondin...

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Abstract

The invention discloses a colorimetric analysis method for simply and rapidly detecting mercury ions in an aqueous solution. According to the method, the characteristic of high light absorption coefficient of nanogold is utilized, the nanogold is used as a chromogenic signal component, and simultaneously mercaptoethylamine is used as a specificity identification component. The colorimetric analysis method has the advantages of being low in cost, simple in operation, convenient and rapid. The modified nanogold is stable, high in resistance to high concentration salt ions, slightly interfered by external factors and suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a chemical colorimetric method for detecting mercury ions in aqueous solution using nano gold as a signal element and mercaptoethylamine as a specific recognition element. Background technique [0002] Mercury is a pollutant that has a great impact on human health. Mercury and its compounds can invade the human body through different channels such as the respiratory tract, skin or digestive tract. Human activities cause mercury pollution in water bodies, mainly from wastewater discharged from industries such as chlor-alkali, plastics, batteries, and electronics. Mercury has three valence states, among which mercury in water mainly exists in divalent form. At present, the detection of mercury mainly relies on analytical instruments, such as high performance liquid chromatography, inductively coupled plasma mass spectrometry, and atomic absorption spectrometry. [...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 田丹碧马玉洁黄和宋荣斌梅亚军许智玲
Owner 南京广全环保技术服务有限公司
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