Resonance scattering spectrometry method for determining NH<4+> by using sodium tetraphenylborate ligand for adjusting and controlling nano-silver catalytic activity

A technology of resonance scattering and sodium tetraphenylborate, which is applied in the field of analytical chemistry, can solve the problems of long analysis process, cumbersome method, and inability to measure ammonium root, and achieve the effect of high sensitivity and simple method

Inactive Publication Date: 2017-11-17
GUANGXI NORMAL UNIV
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Problems solved by technology

The titration method is based on the reaction of formaldehyde and ammonium to generate hexamethylenetetramine and hydrogen ions, and then titrate with NaOH. At the same time, titration of hydrogen ions is required to deduct the NaOH consumed by hydrogen ions. The method is cumbersome and cannot be used for trace amounts of ammonium. Ion chromatography has the advantages of good reproducibility and high accuracy, but it is time-consuming and suscep...

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  • Resonance scattering spectrometry method for determining NH&lt;4+&gt; by using sodium tetraphenylborate ligand for adjusting and controlling nano-silver catalytic activity

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[0022] A Resonance Scattering Spectrometric Determination of NH Using Nano-Silver Ligands to Regulate Catalytic Activity 4 + method, including the following steps:

[0023] (1) Prepare a known concentration of NH 4 + Standard solution system: Add 25 μL, 150 μL, 300 μL, 400 μL, 500 μL of 10 μmol / L NH 4 + Then add 15μL 0.1mmol / L nano silver, 500μL 10μmol / L sodium tetraphenylborate solution, 50μL 0.3mol / L glucose, 150μL 1mmol / L AgNO 3 React with 25μL 0.5mol / L NaOH solution in a water bath at 60°C for 6 minutes, shake well, then cool to room temperature with ice water, add 100μL 1mol / L NaCl, and dilute to 2.0mL with twice distilled water;

[0024] (2) Prepare blank control solution system: use the method of step (1) without adding NH 4 + Standard solution to prepare blank control solution system;

[0025] (3) get the NH prepared by steps (1), (2) respectively 4 + The standard solution system and the blank control solution system were poured into a quartz cuvette, and on ...

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Abstract

The invention discloses a resonance scattering spectrometry method for determining NH<4+> by using a sodium tetraphenylborate ligand for adjusting and controlling nano-silver catalytic activity. The method is characterized by comprising the following steps: (1) preparing a NH<4+> standard solution system with known concentration; (2) preparing a blank control solution system not containing NH<4+>; (3) calculating according to the equation that delta I is equal to I minus I0; (4) making a working curve according to a relationship between the delta I and NH<4+> concentration; (5) preparing a to-be-measured sample solution, determining the resonance scattering peak intensity value of the to-be-measured sample solution as an I sample, and calculating according to the equation that delta I sample is equal to I sample minus I0; (6) calculating out the NH<4+> content of the sample solution according to the working curve of step (4). The method of the invention uses the ligand for adjusting and controlling nano-enzyme catalytic activity, and is simple, convenient, quick and high in sensitivity.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for regulating the catalytic activity of nano-silver by using sodium tetraphenylborate ligands to measure NH 4 + Methods. Background technique [0002] Nanozyme is an artificial enzyme, also known as nanomimetic enzyme, which was first proposed by Scrimin and Pasquato and used to describe gold clusters with significant ribonuclease activity. Due to the rapid development of the field of nano research and the unique physicochemical properties of nanomaterials, the impact of nanozymes has been popularized in countless fields, including: biosensing, immunoassays, cancer diagnosis and treatment, neuroprotection, stem cell growth and pollutants Clear etc. CeO 2 There are two mixed valence states of trivalent and tetravalent cerium and oxygen vacancies in it, so it shows excellent catalytic performance in various applications. In view of the fact that nano-cerium can eli...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6402G01N21/6486
Inventor 梁爱惠李重宁李丹彭宇涛蒋治良
Owner GUANGXI NORMAL UNIV
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