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Method for rapidly determining nitrite in water through nanogold resonance scattering spectrometry

A technique of resonance scattering and nitrite, applied in the field of analytical chemistry, can solve the problems of large reagent consumption, long operation time, and many experimental steps, and achieve the effect of simple operation, low cost, and good selectivity

Inactive Publication Date: 2012-05-02
GUANGXI NORMAL UNIV
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Problems solved by technology

Some of these reported methods have many experimental steps, a large amount of reagents, and a long operation time; some have low sensitivity, poor selectivity, and large interference.

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  • Method for rapidly determining nitrite in water through nanogold resonance scattering spectrometry
  • Method for rapidly determining nitrite in water through nanogold resonance scattering spectrometry

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Embodiment Construction

[0019] The rapid determination of nitrite in water by nano-gold resonance scattering spectrometry includes the following steps:

[0020] (1) Preparation of nitrite standard test system: Add 20 μL of 5.8×10 -2 mol / L p-aminobenzenesulfonic acid solution, 20μL 0.1 mol / L hydrochloric acid solution, and then add 0.1μL, 0.5μL, 1μL, 5μL, 10μL, 30μL, 40μL 2.0×10 -3 mol / L nitrite standard solution, mix well, react at room temperature for 5 minutes, add 40μL 4.2×10 ﹣3 mol / L ɑ-naphthylamine solution, mix well, react at room temperature for 40 minutes, then add 200 μL 2.9×10 -4 mol / L nano-gold solution, 50 μL 2.0 mol / L sodium chloride solution, mix well, react at room temperature for 5 minutes, and dilute to 2.0 mL with twice distilled water;

[0021] (2) Prepare a blank control system by the method of step (1) without adding nitrite standard solution;

[0022] (3) Take the solutions of the above systems and place them in quartz cuvettes respectively, and scan the excitation wavele...

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Abstract

The invention discloses a method for rapidly determining nitrite in water through a nanogold resonance scattering spectrometry, which comprises the following determination steps: 1, preparing an analysis solution of known-concentration nitrite, and determining the resonance scattering intensity of the analysis solution to be I at the point of 510 nm; 2, preparing a blank control system without the nitrite, and determining the resonance scattering intensity of the blank control system to be I0; 3, calculating delta I = I0-I; 4, making a work curve by delta I to the concentration C of the nitrite; 5, preparing an analysis solution of a sample to be determined, determining the resonance scattering intensity of the analysis solution to be I, and calculating delta I=I0-I; and 6, calculating the concentration of the nitrite in the determined sample according to working curve. Compared with the existing method, the determination method disclosed by the invention has the advantages that the instruments are simple and easy to operate, and reagents are easy to obtain and have high sensitivity, good selectivity and low cost.

Description

technical field [0001] The invention relates to analytical chemistry, in particular to a method for quickly measuring nitrite in water by nano-gold resonance scattering spectrometry. Background technique [0002] Nitrite often exists in food chains such as processed food, spoiled fruits and vegetables, and water. After the human body consumes nitrite, the normal hemoglobin in the human body can be oxidized and lose the ability to transport oxygen in the body, resulting in tissue hypoxia, resulting in methemoglobinemia . In addition, nitrite reacts with secondary amines to generate carcinogenic nitrosamines. At present, the methods for quantitative determination of nitrite in water mainly include spectrophotometry, flow injection chemiluminescence, fluorescence, catalytic photometry and ion chromatography. Some of these reported methods have many experimental steps, a large amount of reagents, and a long operation time; some have low sensitivity, poor selectivity, and large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63G01N21/49G01N1/38
Inventor 蒋治良鲁晓婷陆顺娇吴蒙许丽莉梁爱惠
Owner GUANGXI NORMAL UNIV
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