Preparation method and application of nano-silver probe for detecting mercury ions

A technology of nano-silver and mercury ions, applied in the field of mercury ion detection, can solve the problems of high cost, the sensitivity needs to be further improved, and the detection range of the probe is narrow, and achieve the effect of low cost, high application value and commercial value, and high sensitivity.

Inactive Publication Date: 2014-06-25
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, there have been some reports on probes for mercury ion detection, but the detection range of these probes is narrow, the cost is high, and the sensitivity needs to be further improved.

Method used

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  • Preparation method and application of nano-silver probe for detecting mercury ions
  • Preparation method and application of nano-silver probe for detecting mercury ions
  • Preparation method and application of nano-silver probe for detecting mercury ions

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Embodiment 1

[0026] A preparation method for detecting mercury ion nano-silver probes of the present invention comprises the following steps:

[0027] (1) Preparation of sodium citrate-nanometer silver

[0028] Add 57.3mL ultrapure water into the beaker, and while stirring in an ice bath, add 1.50mL, 24mM sodium citrate solution and 1.0mL, 24mM sodium borohydride solution in turn, after stirring evenly, quickly add 0.55mL, 23.5 mM silver nitrate solution, the solution turns yellow, indicating that sodium citrate-nano-silver is generated, and sodium citrate is attached to the nano-silver. After stirring continuously in the ice bath for 3 minutes, turn to normal temperature and stir for 3 hours. After washing and centrifuging , to obtain sodium citrate-nanometer silver, wherein the particle size of nano-silver particles is 5nm~100nm; sodium citrate-nano-silver is mixed with deionized water, so that the concentration of nano-silver in the mixed solution is 15.204μg / mL, which is obtained Sodi...

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Abstract

The invention discloses a preparation method and application of a nano-silver probe for detecting mercury ions. The preparation method comprises the steps of stirring a sodium citrate-nano-silver solution at normal temperature, and adding a Tween20 solution while stirring to obtain the nano-silver probe. The application method of the nano-silver probe comprises the steps of adding the nano-silver probe into a sodium chloride solution, mixing uniformly, adding a solution to be detected into the mixed liquid for reacting at normal temperature, measuring ultraviolet and visible absorption spectrum of the product solution, judging whether the solution to be detected contains mercury ions according to the absorbance change, and calculating the concentration of the mercury ions according to a linear regression equation. The preparation method and the application process of the nano-silver probe are simple, the condition is mild, the cost is low, and the nano-silver probe is high in mercury ion detecting sensitivity, good in selectivity and high in absorptivity.

Description

technical field [0001] The invention belongs to the field of mercury ion detection, and in particular relates to a preparation method and application of a nano-silver probe for detecting mercury ions. Background technique [0002] Mercury is a non-essential element for the human body, and it will be harmful to human health at low concentrations, causing damage to the brain and central nervous system, and functional decline in liver, kidney, and gastrointestinal tract. Currently, Hg in environmental water samples 2+ The determination methods mainly include inductively coupled plasma mass spectrometry, cold atomic absorption spectrometry, surface-enhanced Raman scattering and electrochemical methods. However, these methods have their disadvantages, such as expensive equipment, complicated methods, poor stability, and time-consuming , low sensitivity, general selectivity, etc. Therefore, it is of great significance to seek a convenient, simple, ultra-sensitive, and highly spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 陈桂秋郭志曾光明陈安伟晏铭牛秋雅刘灵芝张企华
Owner HUNAN UNIV
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