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Method for detecting trace iron ions at high sensitivity

A sensitive detection, iron ion technology, applied in the direction of chemical reaction of materials for analysis, chemiluminescence/bioluminescence, etc., can solve the problems of complex testing methods and insufficient sensitivity.

Inactive Publication Date: 2010-07-28
YANCHENG TEACHERS UNIV
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Problems solved by technology

Traditional detection methods, such as colorimetry, atomic absorption method, chemiluminescence method, etc., are complex and not sensitive enough

Method used

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  • Method for detecting trace iron ions at high sensitivity
  • Method for detecting trace iron ions at high sensitivity
  • Method for detecting trace iron ions at high sensitivity

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Experimental program
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Embodiment 1

[0023] 1 Instruments and reagents

[0024] LS-50B Fluorescence Spectrophotometer (Perkin-Elmer, USA); pHS-3C Precision pH Meter (Shanghai Precision Scientific Instrument Co., Ltd.); Quartz Automatic Double Pure Water Distiller (Changzhou Guohua Electric Co., Ltd.); FA1004N Electronic analytical balance (Shanghai Minqiao Precision Scientific Instrument Co., Ltd.).

[0025] Iron standard solution: accurately weigh 0.08634gNH 4 Fe(SO 4 ) 2 12H 2 O, dissolved in a small amount of twice-distilled water, and fixed to a 100mL volumetric flask, made into 0.1g L -1 Iron (III) ion standard solution, diluted to 10.0mg L when used -1 working fluid. Diaminomalenitrile (DAMN) solution (10.0g L -1 ): Accurately weigh 1.000g DAMN, dissolve it with a small amount of absolute ethanol, distill the volume to 100mL with twice distilled water, and make 10.0g·L -1 The stock solution is diluted step by step to the working solution of the required concentration when used. Infant nutrition ric...

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Abstract

The invention discloses a method for detecting trace iron ions at high sensitivity, which comprises the steps of: searching a proper medium condition of diaminomaleonitrile (DAMN); measuring fluorescence intensities of a coordination compound, the coordination compound and a medium, and the coordination compound and the medium and metal ions; determining hypersensitivity or quenching effect generated by metal ions to the fluorescence of the coordination compound; measuring a linear relation between the concentration of the metal ions and a quenching value; and measuring the content of the metal ions in food. By using characteristic of quenching generated by the iron ions to the fluorescence of the DAMN and the linear relation formed between the fluorescence quenching value (delta F) and the concentration of the iron ions, the method is further used for measuring the content of iron in foods of infant rice flour, milk powder and the like, wherein the detection limit of the iron is 1.5 mu g.L<-1>, and the relative standard deviation is 0.17 percent. Compared with the prior art, the method has the advantages of good selectivity, high sensitivity, simple and convenient use, and the like.

Description

technical field [0001] The invention relates to a method for detecting trace metal ions with high sensitivity, belongs to the technical field of analysis and detection, and in particular relates to a method for detecting trace iron ions. Background technique [0002] Metal ion iron is an essential trace element for the human body and plays an important role in the biochemical process of the human body. Excessive or insufficient intake of the human body will have a great impact on health. Therefore, it is of great significance to carry out highly sensitive detection of the content of metal ions necessary for human body in food, especially the accurate determination of iron content in food for infants and young children. Traditional detection methods, such as colorimetry, atomic absorption method, chemiluminescence method, etc., have complicated testing methods and insufficient sensitivity. Contents of the invention [0003] The technical problem to be solved by the present...

Claims

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Application Information

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IPC IPC(8): G01N21/76
Inventor 乔善宝
Owner YANCHENG TEACHERS UNIV
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