Nanometer gold colorimetry method for rapidly detecting lead ions

A nano-gold colorimetry, lead ion technology, applied in the field of analytical chemistry, can solve problems such as difficult operation and complicated process, and achieve the effect of high application value, mild reaction conditions and strong resistance

Inactive Publication Date: 2018-05-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has strong selectivity and high sensitivity, but it needs to be modified on the surface of nanoparticles, the process is complicated, the operation is difficult, and it is difficult to be extended to practical applications (Thomas K G et al.In Situ Synthesis of Metal Nanoparticles and SelectiveNaked-Eye Detection of Lead Ions from Aqueous Media[J].Phys.Chem C,2007,111:12839~12847.)

Method used

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  • Nanometer gold colorimetry method for rapidly detecting lead ions
  • Nanometer gold colorimetry method for rapidly detecting lead ions
  • Nanometer gold colorimetry method for rapidly detecting lead ions

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Experimental program
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Embodiment 1

[0031] (1) AuNPs-B 12 h 12 2- Solution preparation

[0032] The present invention uses Na 2 B 12 h 12 Gold nanoparticles (AuNPs) were prepared by reduction of chloroauric acid (the transmission electron microscope picture is shown in image 3 (A) shown). First, soak all the glass instruments and magnets with aqua regia, add 1g HAuCl 4 4H 2 O was dissolved in 100mL distilled water to obtain a chloroauric acid solution with a concentration of 1wt%; accurately weighed 0.9895g Na 2 B 12 h 12 Dissolve in 100 mL of distilled water to obtain a concentration of 8×10 -5 mol / L Na 2 B 12 h 12 solution.

[0033] Get 1mL 1wt% chloroauric acid solution, add in the 250mL round bottom flask that fills 100mL deionized water, stir at room temperature; The molar ratio of salt to chloroauric acid is 0.1 ~ 1:1), quickly added to the above 250mL round bottom flask, the mixed solution changed from colorless to purple after 1 minute, and continued to stir for 30 minutes to obtain AuNP...

Embodiment 2

[0043] Compared with Embodiment 1, the only difference is that in this embodiment:

[0044] (1) Using cesium dodecahydrododecaborate (Cs 2 B 12 h 12 ) to prepare burgundy AuNPs-B by reducing chloroauric acid 12 h 12 2- Solution, wherein, the concentration of nano gold is 0.8nmol / L, [B 12 h 12 ] 2- The concentration is 4×10 -5 mol / L, the particle size of nano gold is 14nm;

[0045] (2) Add an appropriate amount of NaOH solution to the solution obtained in step (1), and adjust the pH of the solution to 10;

[0046] (3) adding an appropriate amount of NaCl solution to the solution obtained in step (2), controlling the concentration of NaCl to be 80mmol / L;

[0047] (4) in the solution that step (3) obtains, add the Pb to be measured 2+ solution, mixed evenly, and measure the ultraviolet-visible absorption spectrum of the solution after 20 minutes to obtain the ultraviolet-visible absorption spectrum corresponding to different concentrations of lead ions. Then use the a...

Embodiment 3

[0049] Compared with Embodiment 1, the only difference is that in this embodiment:

[0050] (1) Potassium dodecahydrododecaborate (K 2 B 12 h 12 ) to prepare burgundy AuNPs-B by reducing chloroauric acid 12 h 12 2- Solution, wherein, the concentration of nano gold is 2.2nmol / L, [B 12 h 12 ] 2- The concentration is 6×10 -5 mol / L, the particle size of nano gold is 10nm;

[0051] (2) Add an appropriate amount of NaOH solution to the solution obtained in step (1), and adjust the pH of the solution to 12;

[0052] (3) adding an appropriate amount of NaCl solution to the solution obtained in step (2), controlling the concentration of NaCl to be 50mmol / L;

[0053] (4) to step (3) obtained - Pb to be tested was added to the solution 2+ solution, mixed evenly, and measure the ultraviolet-visible absorption spectrum of the solution after 15 minutes to obtain the ultraviolet-visible absorption spectrum corresponding to different concentrations of lead ions. Then use the abso...

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Abstract

The invention discloses a nanometer gold colorimetry method for rapidly detecting lead ions. According to the present invention, a boron cluster compound is used as a reducing agent and a stabilizer,a AuNPs-B12H12<2-> solution is prepared by using a chemical reduction method, nanometer gold is used as a coloring signal element due to the high absorption coefficient of the nanometer gold, the pH value of the AuNPs-B12H12<2-> solution is adjusted to 10-12, an electrolyte is added to make the AuNPs-B12H12<2-> solution in a metastable state, and then a solution to be detected is added, such thatthe Pb<2+> in the solution can be quickly, efficiently and specifically detected; and the colorimetric analysis method has advantages of simple preparation, no purification treatment, no requirement of further modification, long-term storage at the room temperature, low hetero-ion-induced interference, high Pb<2+> detection sensitivity and the like.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a method of using nano-gold as a signal element, and by adjusting the pH of the nano-gold solution, dodecahydrododecaborate ([B 12 h 12 ] 2- ) as a chemical colorimetric method for detecting lead ions in aqueous solution as a specific recognition element. Background technique [0002] Lead is a kind of toxic heavy metal element, which can continuously accumulate in human body and animal tissue, causing great impact and harm to life safety. The main toxic and side effects of lead on the human body are anemia, nervous dysfunction and kidney damage. Lead poisoning can also affect children's intellectual development, including language ability, memory and concentration. Lead in the soil can inhibit the activity of urease and conversion enzyme, and the long-term application of large amounts of lead-containing sludge or sewage irrigation may seriously affect the trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/33
Inventor 张海波漆斌周晓海
Owner WUHAN UNIV
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