Method for detecting hydrogen sulfide based on ruthenium nanoparticle colorimetric method

A nanoparticle, hydrogen sulfide technology, applied in the measurement of color/spectral properties, material analysis by observing the impact on chemical indicators, measuring devices, etc., can solve the problems of low sensitivity of hydrogen sulfide and inappropriate detection of trace hydrogen sulfide, etc. Achieve the effect of improving sensitivity, high accuracy and high sensitivity

Active Publication Date: 2017-10-24
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sensitivity of the current colorimetric method for detecting hydrogen sulfide is too low to be suitable for the detection of trace amounts of hydrogen sulfide.

Method used

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  • Method for detecting hydrogen sulfide based on ruthenium nanoparticle colorimetric method
  • Method for detecting hydrogen sulfide based on ruthenium nanoparticle colorimetric method
  • Method for detecting hydrogen sulfide based on ruthenium nanoparticle colorimetric method

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Experimental program
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Effect test

Embodiment 1

[0020] Press Ru 3+ : PVP monomer molar ratio is 1:10, respectively weigh 0.0123g RuCl 3 ·nH 2 O and 0.0555g PVP, under ultrasound, both are fully dissolved in 10mL ethylene glycol to form a polymer-protected ruthenium complex. The above mixed solution is poured into a 50mL round bottom flask, a stirring bar is added, and the solution is heated to 170°C and kept at this temperature for 6 hours, the solution turned from brownish red to brownish black, that is, the reaction was completed. Mix the original solution with the precipitating agent acetone at 1:3 and then centrifuge. After centrifuging at 8000 rpm for 5 minutes, take the precipitate and wash it with water. Repeatedly wash with acetone and deionized water for 3-5 times, and the obtained precipitate is dissolved in water to be a ruthenium nanoparticle water (Ru NPs) solution. At this time, the concentration of Ru NPs is calculated to be 26 μM. The obtained ruthenium nanoparticles are characterized by TEM and the resul...

Embodiment 2

[0022] The treated Ru NPs aqueous solution was diluted 32 times before the test, and the diluted concentration was 0.81 μM. And the wavelength position of the maximum absorbance of Orange I under alkaline conditions was measured at 512nm with an ultraviolet spectrophotometer in advance.

[0023] First, add 4 μL of 10 -2 M Orange I dye was added to a 2mL 0.8M hydrazine hydrate cuvette. At this time, the final concentration of Orange I was 0.02mM and the solution was alkaline, and the color of Orange I turned dark red. Then, 20 μL of different concentrations (0.5-80 μM) of Na 2 S was added to 10 μL 0.81 μM Ru NPs solution, and after the two were mixed evenly, the Ru NPs-Na 2 S mixed solution was immediately added to the cuvette. Finally, the UV-Vis spectrophotometer measured the degradation kinetics curve of Orange I at the maximum wavelength (512nm) in alkaline solution. All tests were performed at ambient temperature (21-26°C).

[0024] Such as figure 2 As shown, under ...

Embodiment 3

[0026] In order to accurately detect hydrogen sulfide, the relationship between the concentration of hydrogen sulfide and the reaction rate constant of each curve is calculated to obtain image 3 . The quantification curve showed a good linear relationship in the concentration range of 5.0-100nM and 100-800nM. The correlation coefficients of the curves are r=0.9923, n=8; r=0.9981, n=4, respectively. Based on the signal-to-noise ratio (S / N) = 3, the detection limit of this method for the determination of hydrogen sulfide is about 0.6 nM.

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Abstract

The invention provides a method for detecting hydrogen sulfide based on a ruthenium nanoparticle colorimetric method. According to the method, ruthenium nanoparticles can enable azo dyes to fade in the presence of hydrazine hydrate, while the hydrogen sulfide can be bound to the ruthenium nanoparticles to form ruthenium sulfur bonds (Ru-S), so that the activities of the ruthenium nanoparticles for degrading the dyes are passivated. When the concentration of the hydrogen sulfide is high, the passivation degree of the ruthenium nanoparticles is deep, and then the azo dyes are difficult to fade. A novel colorimetric method used for detecting the hydrogen sulfide is developed by utilizing hydrogen sulfide induced ruthenium nanoparticle inactivation. By optimizing experimental parameters, the method detects that the hydrogen sulfide shows two good linear relations in the concentration ranges of 0.5-100nM and 100-800nM under the optimal conditions, and the detection limit is 0.6nM. Compared with the colorimetric method in a literature report, the method disclosed by the invention is capable of realizing rapid analysis, extremely high in sensitivity and excellent in selectivity and has important significances when being used for detecting the hydrogen sulfide in actual samples, particularly atmosphere.

Description

technical field [0001] The invention relates to the detection of hydrogen sulfide. In particular, a method for detecting hydrogen sulfide based on ruthenium nanoparticle colorimetry belongs to the field of analytical chemistry and nanotechnology. Background technique [0002] Hydrogen sulfide is a rotten egg smell and is highly toxic. A large amount of hydrogen sulfide will be produced in industries such as sewage, coal mines, and oil and gas. On the other hand, hydrogen sulfide is considered as an important gas signal molecule, which is involved in various physiological processes, and its content is related to various diseases, such as Alzheimer, diabetes and liver cirrhosis. All in all, the content of hydrogen sulfide is not only an important environmental indicator but also an important biomedical indicator, so the quantitative detection of hydrogen sulfide is of great significance to the environment. [0003] Currently, the most common techniques used to detect hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/3103G01N21/78
Inventor 赵媛罗耀东崔林艳杨璇
Owner JIANGNAN UNIV
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