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Method for prolonging shelf life of 0.5% starch solution

A technology of starch solution and shelf life, which is applied in the field of chemical and chemical solution preparation, can solve the problems of additional cost, waste of working time, and short service life, and achieve the effects of prolonging service life, saving electricity costs, and reducing labor intensity

Active Publication Date: 2018-08-24
WESTERN MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In YS / T 521.1-2009 and YS / T 745.1-2010, in the scheme of iodometric determination of copper element, 0.5% starch solution needs to be used as indicator agent, although the preparation method of 0.5% starch solution is very simple, but with The increase of the storage time of the solution or the hot weather in summer, the large growth of bacteria and the dissolution of carbon dioxide in the starch solution will accelerate the deterioration of the starch solution, resulting in a short service life, which can only be stored for 2-3 days in summer. match
Sometimes the sample is just half done, but when the indicator is added, it is found that the starch solution has expired, resulting in low work efficiency, waste of work time, waste of samples, additional costs, and economically uneconomical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, the method for prolonging the shelf life of 0.5% starch solution, the steps are as follows,

[0013] 1) Weigh 0.5g of analytically pure soluble starch in a 100mL beaker, weigh 0.05g of analytically pure anhydrous sodium carbonate particles for use, and measure 100mL of distilled water with a graduated cylinder;

[0014] 2) Turn the starch weighed into the beaker into a paste with 20 mL of distilled water;

[0015] 3) Take another 250mL beaker and boil the remaining 80mL of distilled water, pour the pasty starch into the boiling water, boil until clear, and obtain 100mL of 0.5% starch solution;

[0016] 4) After the starch solution in step 3) is cooled to 70° C., add 0.05 g of analytically pure anhydrous sodium carbonate granules to the starch solution, and cool to room temperature for use.

Embodiment 2

[0017] Embodiment 2, the method for prolonging the shelf life of 0.5% starch solution, the steps are as follows,

[0018] 1) Weigh 5g of analytically pure soluble starch in a 1000mL beaker, weigh 0.8g of analytically pure anhydrous sodium carbonate particles for use, and measure 1000mL of distilled water with a graduated cylinder;

[0019] 2) Turn the starch weighed into the beaker into a paste with 200mL of distilled water;

[0020] 3) Take another 1000mL beaker and boil the remaining 800mL of distilled water, pour the pasty starch into the boiling water, boil until clear, and obtain 1000mL of 0.5% starch solution;

[0021] 4) After the starch solution in step 3) is cooled to 80° C., add 0.8 g of analytically pure anhydrous sodium carbonate granules to the starch solution, and cool to room temperature for use.

Embodiment 3

[0022] Embodiment 3, the method for prolonging the shelf life of 0.5% starch solution, the steps are as follows,

[0023] 1) Weigh 5g of analytically pure soluble starch in a 1000mL beaker, weigh 1g of analytically pure anhydrous sodium carbonate particles for use, and measure 1000mL of distilled water with a graduated cylinder;

[0024] 2) Turn the starch weighed into the beaker into a paste with 200mL of distilled water;

[0025] 3) Take another 1000mL beaker and boil the remaining 800mL of distilled water, pour the pasty starch into the boiling water, boil until clear, and obtain 1000mL of 0.5% starch solution;

[0026] 4) After the starch solution in step 3) is cooled to 90° C., add 1 g of analytically pure anhydrous sodium carbonate granules to the starch solution, and cool to room temperature for use.

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Abstract

The invention discloses a method for prolonging the shelf life of a 0.5% starch solution. Analytically pure anhydrous sodium carbonate particles are added into the prepared 0.5% starch solution, and anhydrous sodium carbonate reacts with carbon dioxide in the starch solution to generate sodium bicarbonate in order to reduce the growth speed of bacteria in the starch solution and the deteriorationspeed of the starch solution, so the service life of the starch is greatly prolonged. The shelf life of the 0.5% starch solution is prolonged from original 2-3 d to at least 10 d, and more solutions can be prepared at one time as needed, so repeated preparation is avoided, and the cost is saved. If 1400 mL of the 0.5% starch solution is prepared in 7 d, 20 min boiling is needed, the charge of electricity for preparing the solution with the same milliliter is 26 yuan / year, and the electricity charge is saved by 521.5 yuan / year. The method has the advantages of ensuring of the timeliness, creation of conditions for data reporting, improvement of the timeliness rate, increase of the working efficiency, reduction of the labor intensity of workers, and significant social benefits.

Description

technical field [0001] The invention relates to the technical field of chemical and chemical solution preparation, in particular to a method capable of prolonging the shelf life of 0.5% starch solution. Background technique [0002] In YS / T 521.1-2009 and YS / T 745.1-2010, in the scheme of iodometric determination of copper element, 0.5% starch solution needs to be used as indicator agent, although the preparation method of 0.5% starch solution is very simple, but with The increase of the storage time of the solution or the hot weather in summer, the large growth of bacteria and the dissolution of carbon dioxide in the starch solution will accelerate the deterioration of the starch solution, resulting in a short service life, which can only be stored for 2-3 days in summer. match. Sometimes the sample is just half done, but when the indicator is added, it is found that the starch solution has expired, resulting in low work efficiency, waste of work time, waste of samples, an...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/38
CPCG01N1/28G01N1/38
Inventor 范晓霞
Owner WESTERN MINING CO LTD
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