A semi-quantitative detection method of chlorine bromide iodide ion using indicator displacement reaction

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...

AI Technical Summary

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

Images