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Method for semi-quantitatively determining chloride, bromide and iodine ions by indicator displacement reaction

A replacement reaction and iodide ion technology, which is applied in the field of semi-quantitative detection of chlorine bromide or iodide ion, can solve the problems of difficult color distinction and impossible quantitative analysis of halide ions, and achieve the effect of improving sensitivity and enhancing color change

Active Publication Date: 2013-04-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, their relatively weak color distinctions (AgCl white, AgBr pale yellow, AgI yellow) make color differentiation of these precipitates particularly difficult
Also, quantitative analysis of these halide ions by this method is almost impossible due to the further dissolution of the resulting precipitate by excess chlorine, bromine, or iodide ions

Method used

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  • Method for semi-quantitatively determining chloride, bromide and iodine ions by indicator displacement reaction
  • Method for semi-quantitatively determining chloride, bromide and iodine ions by indicator displacement reaction
  • Method for semi-quantitatively determining chloride, bromide and iodine ions by indicator displacement reaction

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Embodiment Construction

[0039] Establishment of standard "fingerprint" library:

[0040] Specifically:

[0041] 1) Metal ion chromogen and metal ion chelation: ①20 μL 0.01mol / L silver nitrate aqueous solution was added to 1.98mL 0.1mM 3,5-Br2-PADAP ([2-(3,5)-dibromo-2-pyridine azo]-5-diethylaminophenol) metal ion developer in alcohol-water mixed solution (volume ratio 1:1), mix well; , 5-Br2-PADAP metal ion chromogen in the alcohol-water mixed solution (volume ratio 1:1), mix well; ③20μL 0.01mmol / L silver nitrate aqueous solution is added to 1.98mL 0.1μM 3,5-Br2-PADAP In the alcohol-water mixed solution (volume ratio 1:1) of the metal ion chromogen, mix well; ④20μL 0.01mmol / L mercuric chloride aqueous solution is added to 1.98mL 0.1μM 3,5-Br2-PADAP metal ion chromogen In the mixed solution of alcohol and water (volume ratio 1:1), mix well;

[0042] 2) Displacement reaction of the indicator: add 1x10 -5 , 5x10 -5 , 1x10 -4 , 5x10 -4 , 1x10 -3 , 5x10 -3 and 1x10 -2 Add mol / L chloride ion, bro...

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Abstract

The invention relates to a method for semi-quantitatively determining chloride, bromide and iodine ions by indicator displacement reaction. The method comprises chelating an indicator with a metal ion, and replacing the metal ion from the chelate by chloride, bromide or iodine ions through precipitation reaction of the chloride, bromide or iodine ions to the metal ion, so that the chelate returns to the initial color of the indicator. In the method, color imaging apparatuses (scanner, digital camera, etc.) are used for collecting the color change of the indicator; and a fingerprint spectrum of corresponding concentration of chloride, bromide or iodine ions is constructed according to the red, green and blue spectral data corresponding to the color change. In the sample testing process, a mathematical statistical method, such as clustering analysis or principal component analysis, is adopted to compare the sample spectrum with the fingerprint spectrum database, so as to carry out semi-quantitatively analysis on unknown concentrations of chloride, bromide or iodine ions.

Description

technical field [0001] The invention relates to a displacement reaction, in particular to a semi-quantitative detection method for chlorine bromide or iodide ion in the displacement reaction of an indicator. Background technique [0002] Inorganic ions, especially chlorine, bromine, and iodide, play extremely important roles in the environment, industry, and biology. For example, chloride ion maintains the osmotic balance of cells and regulates the pH value of the human body; bromide ion, which is often used as a sedative, regulates the central nervous system. Iodide ions, which essentially block the release of excess thyroid hormone into the bloodstream, can help suppress symptoms such as anxiety and irritability. On the one hand, these halide anions are indispensable to life, but on the other hand, excess halide anions are fatally toxic. [0003] The qualitative and quantitative detection technologies of halogen ions widely used in the world include: coulometric titratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 冯亮关亚风李慧沈铮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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