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Method for testing zinc ions in water through gelatin enrichment method

A zinc ion and gelatin technology, applied in the field of detection, can solve the problems of difficult detection of trace metal elements, accumulation of zinc content, chronic poisoning, etc., and achieve the effects of low price, few samples, and improved accuracy

Inactive Publication Date: 2017-05-24
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The normal human body contains 2-2.5g of zinc, but excessive intake of zinc in the human body can also lead to poisoning. Some children’s toys contain zinc in the paint. Children often put toys in their mouths, resulting in the accumulation of zinc content and leading to chronic poisoned
The detection of trace metal elements has always been a difficult problem. The detection limit of the common method using a spectrophotometer is only 0.05mg / L, which is not suitable for the detection of low-level zinc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Accurately weigh 100 mg of zinc chloride sample, dissolve it in a volumetric flask of 1000 mL, and use it as a standard zinc solution for later use.

[0029] (2) Accurately weigh 0.200 g of gelatin sample for later use.

[0030] (3) Dilute the standard zinc solution in step (1) by 50 times, and place 50 ml of the diluted zinc solution in a 250 mL beaker.

[0031] (4) Heat the diluted zinc solution in step (3) to 85° C., then slowly add the gelatin sample, and stir until the gelatin sample is completely dissolved.

[0032] (5) The solution in step (4) was continuously stirred for 0.5 h, and then the solution was cooled to room temperature to obtain gelatin precipitation.

[0033] (6) Filter the precipitate in step (5), dissolve the filtered precipitate in 5ml, 0.1mol / L hydrochloric acid, heat to 60°C, and keep the temperature for 2h until all the zinc ions are replaced into the solution.

[0034] (7) Use a spectrophotometer to detect the content of zinc ions in the...

Embodiment 2

[0036] (1) Accurately weigh 300 mg of zinc chloride sample, dissolve it in a volumetric flask of 1000 mL, and use it as a standard zinc solution for later use.

[0037] (2) Accurately weigh 0.500 g of gelatin sample for later use.

[0038] (3) Dilute the standard zinc solution in step (1) by 100 times, take 2 portions of 100ml of the diluted zinc solution and put them in 250mL beakers respectively, and mark them as 1 / 2 respectively.

[0039] (4) Heat the zinc solution labeled 1 in step (3) to 85° C., then slowly add the gelatin sample, and stir until the gelatin sample is completely dissolved.

[0040] (5) The solution labeled 1 in step (4) was continuously stirred for 1 h, and then the solution was cooled to room temperature to obtain gelatin precipitation.

[0041] (6) Filter the precipitate in step (5), dissolve the filtered precipitate in 10ml, 0.1mol / L hydrochloric acid, heat to 60°C, and keep the temperature for 2h until all the zinc ions are replaced into the solution....

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Abstract

The invention belongs to the technical field of detection and particularly relates to a method for testing zinc ions in water through a gelatin enrichment method. The method includes the following steps that firstly, a zinc chloride sample is weighed and dissolved, and the volume is determined; secondly, a gelatin sample is weighed; thirdly, the solution obtained in the first step is diluted; fourthly, the solution obtained in the third step is heated, and the gelatin sample is slowly added and then stirred till the whole gelatin sample is dissolved; fifthly, the solution obtained in the fourth step is continuously stirred and then cooled to room temperature, and gelatin precipitate is obtained; sixthly, the precipitate obtained in the fifth step is filtered, the filtered precipitate is dissolved in hydrochloric acid, heated and placed at constant temperature till all the zinc ions are replaced to the solution; seventhly, the content of the zinc ions in the enriched zinc solution obtained in the sixth step is detected through a spectrophotometer. Gelatin used in the method is wide in source and low in price. The enrichment function on to-be-detected element zinc is obvious, the method is simple and easy to operate, and the sensitivity and accuracy of detection results are improved.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for testing zinc ions in water by using a gelatin enrichment method. Background technique [0002] Zinc is one of the 14 essential trace elements for the human body. It is an important part of more than 200 enzymes in the body. It is directly involved in the synthesis of nucleic acids, the metabolism of proteins and amino acids, the differentiation and proliferation of cells, and many important metabolic processes. In view of its extremely important role in important physiological processes such as human development, reproductive genetics, immunity, and endocrine, it is called "life element". [0003] The normal human body contains 2-2.5g of zinc, but excessive intake of zinc in the human body can also lead to poisoning. Some children’s toys contain zinc in the paint. Children often put toys in their mouths, resulting in the accumulation of zinc content and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/40
CPCG01N1/4077G01N21/31G01N2001/4088
Inventor 池明刘鑫业李鹏廷姜大川张润德
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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