Method for rapidly detecting concentration of trace Hg2<+> in river water

A river water and concentration technology, applied in the field of heavy metal detection, to achieve the effect of accurate detection, improved sensitivity and selectivity

Inactive Publication Date: 2014-08-06
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Establishment of an energy transfer system using cadmium telluride quantum dots as acceptors for the detection of Hg 2+ research has not yet been reported

Method used

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  • Method for rapidly detecting concentration of trace Hg2&lt;+&gt; in river water
  • Method for rapidly detecting concentration of trace Hg2&lt;+&gt; in river water
  • Method for rapidly detecting concentration of trace Hg2&lt;+&gt; in river water

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Embodiment Construction

[0022] (1) Synthesis of water-soluble CdTe quantum dots:

[0023] a. Add 0.045 g of tellurium powder, 0.115 g of sodium borohydride and 5 ml of secondary water into a 25 ml three-necked flask, mix well, and react for 20 minutes in a 65°C water bath and magnetic stirring to obtain a purple transparent Aqueous sodium telluride hydride solution.

[0024] b. Under nitrogen protection, the concentration in 200 ml is 2.5×10 -3 In the mol / liter cadmium chloride aqueous solution, add 0.10 milliliters of analytically pure mercaptoacetic acid, adjust pH to be 10 with sodium hydroxide, under strong stirring, add the sodium hydride aqueous solution that 5 milliliters of steps (1) step a makes rapidly, in Reflux reaction at 95° C. for 2 hours to obtain a transparent cadmium telluride quantum dot solution.

[0025] (2) Prepare the solution:

[0026] 30 μl of 4.0 x 10 -4 The fluorescent whitening agent solution of mol / liter, the cadmium telluride quantum dot solution that step (1) the b ...

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Abstract

The invention discloses a method for rapidly detecting the concentration of trace Hg<2+> in the river water. In a trihytdroxy methyl-aminomethane-hydrochloric acid buffer solution of which the pH value is 8.2 and a polyvingakohol medium, the energy is effectively transferred between cadmium telluridequantum dots and a fluorescent brightener, the fluorescent brightener transfers the energy to the cadmium telluridequantum dots, and then the fluorescence intensity is strengthened. The Hg<2+> can quench the fluorescence intensity of the cadmium telluridequantum dots in the system, and the quenching degree forms a linear relation with the concentration of the Hg<2+> within limits. Therefore, a novel method for detecting the Hg<2+> through a fluorescent brightener and cadmium telluridequantum dot energy transfer fluorescence quenching method is created. The linearity range of the Hg<2+> is 8.0-800nanograms per liter, and the detection limit is 0.66nanogram per liter. The method overcomes the defects of low sensitivity and narrow scope of application and the like in the prior art, improves the sensitivity and the selectivity, and can more conveniently and rapidly detect the trace Hg in the river water.

Description

technical field [0001] The invention belongs to the technical field of heavy metal detection, in particular to a rapid detection of trace Hg in river water using fluorescence resonance energy transfer technology 2+ method of concentration. Background technique [0002] Hg 2+ is a common heavy metal pollutant, due to its high volatility and toxicity, Hg 2+ It is a representative element in environmental pollution research and element geochemistry research. Hg in water 2+ Pollution from the atmosphere and industrial and agricultural production. Studies have shown that Hg 2+ It is a great threat to human health. At present, there are many determination methods for mercury in water, including cold atomic absorption spectrometry, atomic fluorescence spectrometry, ultraviolet spectrophotometry, and HPLC-ICP / MS, etc., but some of these methods are complex in operation, high in cost, and somewhat sensitive Less than required. Therefore, looking for trace Hg in water 2+ It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 陶慧林廖秀芬徐铭泽黎舒怀钟福新易忠胜
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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