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Method for detecting iodine concentration

A technology of iodine concentration and concentration, which is applied in the field of chemical detection, can solve the problems of a large amount of waste liquid containing arsenic, which is difficult to popularize and use, and difficult to purchase reagents, and achieves the effects of small micropore volume, automatic operation, and small amount of catalyst

Inactive Publication Date: 2020-04-10
HARBIN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the strict examination and restrictions on the qualifications of highly toxic reagents purchased by the public security department, it is difficult to purchase the arsenic trioxide (commonly known as arsenic) reagent required for the application of the arsenic-cerium catalytic photometric standard method, and a large amount of arsenic-containing waste liquid is produced after the application of this method. pollute the environment
Inductively coupled plasma mass spectrometry (ICP-MS) has a fast analysis speed and is currently used in some laboratories, but the instrument is expensive and the cost of use is very high, so it is difficult to promote its use in prefecture-level, city-level and county-level laboratories

Method used

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  • Method for detecting iodine concentration
  • Method for detecting iodine concentration
  • Method for detecting iodine concentration

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0070] In this embodiment, the sample with a known concentration of 50.9±2.3 μg / L is used as the test solution 1 (ie, the sample to be tested), and 8 main wells are used as the standard curve test series, and 24 auxiliary wells are used to detect the test solution 1.

[0071] (1) Preparation of detection solution: preparation of detection solution A, detection solution B, detection solution C and iodine standard intermediate solution with a concentration of 300 μg / L;

[0072] Wherein, detection solution A is arsenous acid solution (c(H 3 AsO 3 )=0.06mol / L): 0.6g of arsenic trioxide, 4g of sodium chloride and 0.2g of sodium hydroxide plus 50mL of pure water, heated to dissolve and then cooled to room temperature. Slowly add 20mL, 2.5mol / L sulfuric acid solution, cool to room temperature, dilute to 100mL with pure water, store in a brown bottle, and store at room temperature for 6 months.

[0073] Detection solution B is ammonium cerium sulfate solution (c(Ce 4+ )=0.025mol / L)...

Embodiment 2

[0092] In this embodiment, a sample with a known concentration of 50.9±2.3 μg / L is used as the test solution 2, 8 main wells are used as the standard curve test column, and 24 auxiliary wells are used to test the test solution 2.

[0093] (1) Take out the preparation of the iodine standard intermediate solution that is 300 μg / L of detection solution A, detection solution B, detection solution C and concentration;

[0094] Immediately before use, draw 30 μL of detection solution C into a 10 mL constant volume tube, and dilute to the mark with pure water to obtain a 300 μg / L iodine standard intermediate solution.

[0095] Take the liquid with a concentration of 5.09±0.23mg / L obtained by diluting the environmental standard sample, take 100.0μL of the liquid and place it in a 10mL constant volume tube, and dilute to the mark with pure water to obtain a test solution of 50.9±2.3μg / L two.

[0096] (2) Sample addition:

[0097] A. Select 8 wells in a 96-well plate as the main wells...

Embodiment 3

[0113]In this embodiment, a sample with a known concentration of 124±12.4 μg / L was used as the test solution 3, 8 main wells were used as the standard curve test column, and 24 auxiliary wells were used to detect the test solution 3.

[0114] (1) Take out the preparation of the iodine standard intermediate solution that is 300 μg / L of detection solution A, detection solution B, detection solution C and concentration;

[0115] Immediately before use, draw 30 μL of detection solution C into a 10 mL constant volume tube, and dilute to the mark with pure water to obtain a 300 μg / L iodine standard intermediate solution.

[0116] Take the solution of the environmental standard sample, accurately draw 0.2mL, and dilute it into a 10mL constant volume tube to obtain the test solution 3 with a concentration of 124±12.4gμg / L.

[0117] (2) Sample addition:

[0118] A. Select 8 wells in a 96-well plate as the main wells, add 75 μL of iodine standard intermediate solution with a concentrat...

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Abstract

The invention discloses a method for detecting iodine concentration. The method comprises the steps of: providing a detection solution A, a detection solution B, a detection solution C, a to-be-detected sample solution and a porous plate; taking a plurality of micropores of the porous plate as a plurality of reaction containers for iodine catalyzed arsenic-cerium oxidation-reduction reactions; simultaneously carrying out a plurality of iodine catalyzed arsenic-cerium oxidation-reduction reactions according to preset requirements, wherein the iodine catalyzed arsenic-cerium oxidation-reductionreaction comprises reactants and a catalyst, the reactants comprise arsenite ions provided by the detection solution A and tetravalent cerium ions provided by the detection solution B, and the catalyst comprises a plurality of known different concentrations of iodine provided by the detection solution C and unknown concentrations of iodine provided by the to-be-detected sample solution; after thereactions, detection is carried out in a micropore detector with a preset detection wavelength, then the concentration of iodine in the to-be-detected sample solution is calculated, and the microporedetector is matched with the porous plate. In this way, the method can detect iodine concentration simply and rapidly with low cost, and can reduce waste emission.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a method for detecting iodine concentration. Background technique [0002] Water iodine is an indicator of population iodine nutrition evaluation and a main monitoring indicator in the prevention and treatment of iodine deficiency disorders. Taking the national survey of iodine content in drinking water carried out in my country from 2017 to 2018 as an example, the survey has tested the water iodine in more than 40,000 townships and more than 120,000 villages. It is conservatively estimated that the number of samples tested is nearly 400,000. This shows that , my country's iodine deficiency disease prevention and control institutions have a great demand for the detection of water iodine. [0003] In recent years, water iodine detection is mainly based on GB / T5750.5-2006 (11.1) standard test method for drinking water-inorganic non-metallic indicators. This method has go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33G01N21/78G01N21/253G01N31/22G01N33/182G01N33/18
Inventor 纪晓红高彦辉杨艳梅孙殿军武辽伟范晨露娄群苏梦瑶张欣张在宏
Owner HARBIN MEDICAL UNIVERSITY
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