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Evaluation method of tea for uranium desorption effect

An evaluation method and desorption technology, applied in the field of biomimetic materials, which can solve the problems of unclear side effects of drugs, inability to be used as in vitro research objects, and easy to deteriorate.

Active Publication Date: 2021-09-10
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bone cannot be used as an in vitro research object due to its complex structure and easy deterioration
[0004] In order to reduce the harm of uranium to human body exposure, drugs are often used to promote the excretion, but the side effects of drugs on the human body are not yet clear, so it is necessary to find a more suitable uranium excretion enhancer

Method used

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  • Evaluation method of tea for uranium desorption effect
  • Evaluation method of tea for uranium desorption effect
  • Evaluation method of tea for uranium desorption effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of urea-formaldehyde resin-based biomimetic material, concrete steps are as follows:

[0028] Step 1, mix bone glue and water at a ratio of 1:3, heat and stir to 75°C to prepare bone glue liquid, and take the bone glue as 20% of the mass of urea-formaldehyde resin (liquid state).

[0029] In step 2, according to the preparation method of alkali-acid-alkali, bone glue solution is added in the acidic stage of urea-formaldehyde resin synthesis to prepare bone glue copolymerized urea-formaldehyde resin.

[0030] Step 3: Dry the bone glue copolymer urea-formaldehyde resin at 70°C until it becomes viscous, add hydroxyapatite and stir evenly, dry at 70°C, crush and sieve to obtain a urea-formaldehyde resin-based biomimetic material, in which hydroxyapatite The amount of stone added is determined according to the ratio of collagen fibers to hydroxyapatite in bone tissue, which is 70% of the mass of bone glue.

Embodiment 2

[0032] The preparation method of uranium-containing urea-formaldehyde resin-based biomimetic material, the specific steps are as follows:

[0033] Step 1: Put 10g of urea-formaldehyde resin-based biomimetic material into 100mL of uranium solution (c(U)=10g / L), vibrate and absorb for 12h, and then stand and suction filter.

[0034] In step 2, the obtained filter residue is washed with deionized water, dried at 70° C., crushed and sieved to obtain a uranium-containing urea-formaldehyde resin-based biomimetic material.

[0035] By measuring the concentration of uranium solution before and after the reaction, the uranium content in the uranium-containing urea-formaldehyde resin-based biomimetic material after 12 hours of reaction was calculated to be 73.41mg / g. This material will be used as the material for subsequent desorption experiments. Changes such as figure 1 shown, from figure 1 It can be seen that the equilibrium is reached after adsorption for 12 h.

Embodiment 3

[0037] Different kinds of tea were used to desorb uranium in uranium-containing urea-formaldehyde resin-based biomimetic materials, and the desorption was carried out in a constant temperature shaking box. Black tea (Jinjunmei), oolong tea (Tieguanyin) and green tea (Biluochun) were selected as tea leaves, the mass ratio of tea leaves to water was 1:50, the soaking temperature was 100°C, and soaked for 1 hour. The pH of black tea is 5.0, the pH of oolong tea is 5.4, and the pH of green tea is 6.0 by using a pH meter. Considering that the pH value of human tissue fluid is generally 7.0-7.5, the pH of the tea water is adjusted to 7.0 with hydrochloric acid and sodium hydroxide. Put 10g of uranium-containing urea-formaldehyde resin-based biomimetic material into 100mL of different kinds of tea for desorption. The desorption temperature is 37°C and the desorption time is 0.5-48 hours. The desorption amount of uranium in the tea is measured. The results are as follows: figure 2 sh...

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Abstract

The invention discloses a method for evaluating the desorption effect of tea on uranium. In the method, firstly, according to the preparation method of alkali-acid-alkali, bone glue is added in the acidic stage of urea-formaldehyde resin synthesis to obtain bone glue copolymerized urea-formaldehyde resin, and then hydroxyapatite is added to obtain a urea-formaldehyde resin-based biomimetic material, and then the urea-formaldehyde resin The uranium-containing urea-formaldehyde resin-based biomimetic material used to simulate the uranium-containing bone was prepared by vibrating adsorption between the base biomimetic material and uranium liquid, and then the desorption effect of tea on the uranium in the material was evaluated by changing the tea soaking conditions. The method confirms that the desorption effect of green tea is better than that of oolong tea and black tea, the total desorption rate of green tea to uranium desorption five times is above 85%, the desorption effect of strong tea is better than that of weak tea, and the desorption effect of overnight tea is better than that of freshly brewed tea. This evaluation method can be used to distinguish the desorption effects of different types of tea, and to reduce the internal exposure hazard of uranium to human body by determining the best way of drinking tea. This method can be used as a reference for radiation workers to drink tea to deplete uranium.

Description

technical field [0001] The invention belongs to the technical field of bionic materials, and in particular relates to a method for evaluating the desorption effect of tea on uranium. Background technique [0002] The internal radiation hazards caused by uranium pollution in water bodies have always been the focus of attention. The main cause of internal exposure hazards is the binding of uranium to bone. Uranium in water is mainly UO 2 2+ Exist in form, when people mistakenly drink uranium-containing water, UO 2 2+ Absorbed into the blood through the intestinal tract, and finally transferred to liver, kidney, bone and other organs and tissues. Uranium is chemically toxic and radioactive, mainly manifested as chemical toxicity to the liver and kidney, and mainly manifested as internal radiation hazards caused by radioactivity to bones. Compared with chemical toxicity, internal radiation is more harmful, because uranium can be attached to the bone surface for a long time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/36G01N1/28
Inventor 唐双凌谢剑南戴君诚郑小燕
Owner NANJING UNIV OF SCI & TECH
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