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Method for detecting heavy metal lead based on nanogold chain material

A nano-gold and heavy metal technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of expensive equipment and complicated processing, and achieve the effect of low detection cost, simple preparation method, and elimination of interference

Inactive Publication Date: 2012-10-10
蒋彩云
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Problems solved by technology

However, these methods have disadvantages such as complicated sample pretreatment, expensive instruments, and the need for professionals to operate.

Method used

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  • Method for detecting heavy metal lead based on nanogold chain material
  • Method for detecting heavy metal lead based on nanogold chain material
  • Method for detecting heavy metal lead based on nanogold chain material

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Embodiment Construction

[0016] 1. Preparation of gold nanoseeds

[0017] Add 3 mL of 1% HAuCl4 to 200 mL of ultrapure water at 4 °C, stir, and then add 1 mL of K 2 CO 3 (0.2mol·L -1 ), and finally add 9mLNaBH quickly 4 (0.5mg·mL -1 ), stirred for 5min. The obtained wine-red gold nano-seed solution was stored at 4° C. for future use.

[0018] 2. Preparation of nano-gold chain structure

[0019] First prepare HAuCl 4 / K 2 CO 3 solution, 25 mg of K 2 CO 3 Dissolve in 100mL phosphate buffer solution (pH7.4, 0.01M), stir for 10min, and dissolve 1.5ml of 1% HAuCl 4 Added into the reaction solution, continued to stir for 30min, the solution gradually changed from light yellow to colorless and transparent. Take 2mL of prepared HAuCl 4 / K 2 CO 3 solution, add 70μL gold seeds, then add 150μL GA / NaCl solution (10mg GA dissolved in 10mL NaCl solution (0.2M)), stir for 30min, the color of the solution changes from red to blue, centrifuge (20min, 6000rpm, 20℃ ) and dispersed in water, repeat the op...

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Abstract

The invention discloses a method for detecting heavy metal lead based on a nanogold chain structure. The method comprises the following steps: a gallic acid (GA) serving as a reducing agent, a protecting agent and a functional molecule reduces a chloroauric acid solution with a certain ionic strength with the existence of a 3-5nm nanogold seed to generate the nanogold chain material with the particle size of about 12+ / -3nm. The change of a nano chain spectrum, caused by the complexing effect of both the functional molecule (gallic acid) in the structure and heavy metal lead, is utilized to detect lead ions. A spectrophotometer is used in the detection process, the operation is simple and convenient, the detection limit can reach 10-9M and the selectivity is better. Compared with the application of nanogold particles used for detection, the chain material has better stability when pH is larger than 4.2, and can not be influenced by the ionic strength within a certain range. The method can be used for detection heavy metal lead in commodities, such as water, food, cosmetics and the like, and has a better practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of nano-biological analysis, and in particular relates to a method for detecting heavy metal lead based on a nano-gold chain material. Background technique [0002] The heavy metal lead has a strong stability and accumulation effect. Lead in the environment can not only enter the animal body through feed, drinking water, etc., and then remain in animal foods such as milk and muscle, but also remain in the transmission medium such as water and air. In plant foods such as vegetables and fruits. At the same time, more than 10 million tons of food are polluted each year due to the pollution of cultivated land, soil and water resources, causing serious food safety problems. Chinese medicinal materials, tea and cosmetics have also become the hardest hit areas of lead pollution. Lead can combine with functional groups (such as thiol) in a series of proteins, enzymes and amino acids in the human body, thereby affec...

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Application Information

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IPC IPC(8): G01N21/25
Inventor 蒋彩云
Owner 蒋彩云
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