Method for determining residual selenium dioxide content in sodium selenite

A technology of sodium selenite and a determination method, which is applied in the direction of chemical analysis by titration, can solve the problems of low selenium dioxide and the inability to measure the content of selenium dioxide, and achieve the effect of reliable guarantee and convenient determination method

Pending Publication Date: 2019-03-29
昕嘉生物技术(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the content of selenium dioxide in the sodium selenite sample is very low, and the conventional method can only measure the total selenium content in the sodium selenite sample, and cannot accurately determine the residual or adulterated selenium dioxide from the sodium selenite sample. Selenium oxide content

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  • Method for determining residual selenium dioxide content in sodium selenite
  • Method for determining residual selenium dioxide content in sodium selenite
  • Method for determining residual selenium dioxide content in sodium selenite

Examples

Experimental program
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Embodiment 1

[0040] A kind of assay method of residual selenium dioxide content in sodium selenite of the present invention, comprises the following steps:

[0041] (1) take by weighing sodium selenite sample quality W 0 =10.0012g (accurate to 0.0002g), put it in a beaker, add V 1 =100ml absolute ethanol, stirred for 1min, filtered after standing;

[0042] (2) Use a pipette to accurately pipette V 2 =50mL filtered solution in a 300mL iodine bottle, add 80mL of water, add 5mL of (1+1) hydrochloric acid solution with a mass concentration of 37%, add 2g of potassium iodide, cover the iodine bottle cap, shake well, and place in a dark place 10min;

[0043] (3) Titrate with a standard solution of sodium thiosulfate (accurate to 0.0001mol / L) with a calibrated concentration C=0.1005mol / L to the near end point, after the color changes from brownish red to light yellow, add 2mL of 10g / L starch indicator , continue to titrate to the end point, the color of the solution turns bright orange, the o...

Embodiment 2

[0049] A kind of assay method of residual selenium dioxide content in sodium selenite of the present invention, comprises the following steps:

[0050] (1) take by weighing sodium selenite sample quality W 0 =10.0007g (accurate to 0.0002g), put it in a beaker, add V 1 = 100ml of absolute ethanol, stirred for 1min, dried and filtered after standing;

[0051] (2) Use a pipette to accurately pipette V 2 =50mL filtered solution in a 300mL iodine bottle, add 80mL of water, add 5mL of (1+1) hydrochloric acid solution with a mass concentration of 37%, add 2g of potassium iodide, cover the iodine bottle cap, shake well, and place in a dark place 10min;

[0052] (3) Titrate with the calibrated concentration C = 0.1005mol / L sodium thiosulfate standard solution (accurate to 0.0001mol / L) to the near end point, after the color changes from brownish red to light yellow, add 2mL of 10g / L starch indicator, Continue to titrate to the end point, the color of the solution turns bright orange...

Embodiment 3

[0059] A kind of assay method of residual selenium dioxide content in sodium selenite of the present invention, comprises the following steps:

[0060] (1) take by weighing sodium selenite sample quality W 0 =10.0024g (accurate to 0.0002g), put it in a beaker, add V 1 = 100ml of absolute ethanol, stirred for 1min, dried and filtered after standing;

[0061] (2) Use a pipette to accurately pipette V 2 =50mL filtered solution in a 300mL iodine bottle, add 80mL of water, add 5mL of (1+1) hydrochloric acid solution with a mass concentration of 37%, add 2g of potassium iodide, cover the iodine bottle cap, shake well, and place in a dark place 10min;

[0062] (3) Titrate with the calibrated concentration C=0.1005mol / L sodium thiosulfate standard solution to the near end point, after the color changes from brownish red to light yellow, add 2mL of 10g / L starch indicator, continue titration to the end point, the solution color changes It is bright orange, the original color disappe...

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Abstract

The invention discloses a method for determining residual selenium dioxide content in sodium selenite. The method for determining the residual selenium dioxide content in sodium selenite comprises thefollowing steps: weighing a sodium selenite sample, adding absolute ethanol, stirring, and filtering after standing; accurately removing the filtered solution, adding water, hydrochloric acid solution and potassium iodide, shaking well, and placing in the dark; and titrating to near-end point with calibrated sodium thiosulfate standard solution; adding a starch indicator after the color of the solution turns from brownish red to pale yellow; continuing to titrate to the end point; recording the volume of the consumed sodium thiosulfate standard solution after the color of the solution turns to bright orange and the original color disappears; doing a no sample blank control experiment; and calculating the content of residual selenium dioxide in sodium selenite according to a formula. The method for determining the residual selenium dioxide content in sodium selenite disclosed by the invention fills the blank of the testing technology in the prior art, and provides a high-efficiency, accurate, simple and convenient method for measuring the residual amount of selenium dioxide for the feed enterprise, and provides a reliable guarantee to the sodium selenite product which can be selected and used by the feed enterprise.

Description

technical field [0001] The invention belongs to the technical field of chemical component detection, in particular to a method for determining the content of residual selenium dioxide in sodium selenite. Background technique [0002] As a feed additive, sodium selenite is widely used in feed to supplement selenium needed by animals such as livestock and poultry. Selenium is a component of glutathione peroxidase, which maintains the function of cell membranes through oxidation and improves Production of endogenous antioxidants by the lipidic nature of proteins. Participate in the conversion of energy, affect metabolism, and play an extremely important role in the emulsification and absorption of fat and the absorption of multivitamins. At the same time, it also participates in the synthesis of coenzyme A and coenzyme Q, affects the functions of other biological enzyme systems, and affects the metabolism of amino acids, protein synthesis, carbohydrate metabolism, and biologic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 黄逸强向阳葵倪自利邓敏周长虹
Owner 昕嘉生物技术(长沙)有限公司
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