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Method of determining cyanide concentration in solution

A cyanide ion and solution technology, which is applied in the field of chemical analysis, can solve the problems of easy decomposition of cyanide, large deviation of measurement results, and easy interference by other ions or colored substances, and achieve the effect of simple operation and safe measurement process

Pending Publication Date: 2019-08-20
HEBEI HUARONG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the volumetric method and the spectrophotometric method are easily interfered by other ions or colored substances, the recovery rate is unstable, and the measurement results have large deviations
Distillation is required for spectrophotometric determination, and cyanide is easily decomposed during heating, resulting in unstable determination results
Moreover, highly toxic substances such as cyanide and pyridine need to be used in the process of spectrophotometry, which also brings safety hazards to the laboratory

Method used

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  • Method of determining cyanide concentration in solution
  • Method of determining cyanide concentration in solution
  • Method of determining cyanide concentration in solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The linear relationship of the method of the present invention is verified and explained.

[0045] (1) Take 100 mL of potassium cyanide standard solution with a calibrated concentration of 87 mg / L for use, and the converted cyanide ion concentration is 34.8 mg / L.

[0046] (2) Weigh 0.40g of hydroxocobalamin acetate, add it to a 1000mL beaker, dissolve and dilute to 1000mL with deionized water.

[0047] (3) Dilute the potassium cyanide standard solution 5, 10, 20, and 50 times respectively as the solution to be tested.

[0048] (4) Take five 100mL volumetric flasks, and add 3 / 4 volume of the hydroxocobalamin acetate solution prepared in step 2 to each volumetric flask, and add 1mL of the solution to be tested to each of the four volumetric flasks, and one volumetric flask Add 1mL of deionized water to it as a blank sample, use deionized water to make up all five volumetric flasks, and bathe in water at 40°C for 60min.

[0049] (5) Dilute the high concentration cyanocob...

Embodiment 2

[0055] The verification of the repeatability of the method of the present invention shows that the concentration of cyanide ions in the sample to be tested is lower than 0.1 mg / L.

[0056] (1) Take 100 mL of potassium cyanide standard solution with a calibrated concentration of 87 mg / L for use, and the converted cyanide ion concentration is 34.8 mg / L.

[0057] (2) Weigh 0.40 g of hydroxocobalamin hydrochloride, dissolve it with deionized water, and dilute to 10 mL to prepare a concentrated solution of hydroxocobalamin hydrochloride.

[0058] (3) Dilute the potassium cyanide standard solution by 1000 times as the solution to be tested.

[0059] (4) Take five 100mL volumetric flasks and rinse them with the solution to be tested. Add 1mL hydroxocobalamin hydrochloride concentrated solution to 4 volumetric flasks, and add 1mL deionized water to the other 1 volumetric flask. Use all 5 volumetric flasks The solution to be tested was fixed to volume and placed in a water bath at 40°...

Embodiment 3

[0065] The cyanide ion concentration of the sample to be tested is higher than 0.1 mg / L, and the repeatability of the determination method of the present invention is verified.

[0066] (1) Take 100 mL of potassium cyanide standard solution with a calibrated concentration of 87 mg / L for use, and the converted cyanide ion concentration is 34.8 mg / L.

[0067] (2) Weigh 0.40g of hydroxocobalamin, put it into a 1000mL beaker, dissolve and dilute to 1000mL with deionized water.

[0068] (3) Dilute the potassium cyanide standard solution 10 times as the solution to be tested.

[0069] (4) Take five 100mL volumetric flasks and add 3 / 4 volume of hydroxocobalamin solution to the volumetric flasks. Add 1mL of the solution to be tested to four of the volumetric flasks, and add 1mL of deionized water to the other one. Dilute to volume with deionized water, and bathe in 40°C water bath for 60min.

[0070] (5) Dilute the high concentration cyanocobalamin standard solution (100.4mg / L) 25 t...

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Abstract

The invention discloses a method of determining a cyanide concentration in a solution. The characteristics that hydroxycobalamin, the salt thereof and cyanide in the solution are combined to cyanocobalamin are used, the concentration of cyanocobalamin in the solution is detected through high performance liquid chromatography, the concentration of the cyanide in the solution is thus calculated, andthe calculation formula is C2 = (C1.S2.D.26) / (S1.1355). The property that hydroxylcobalamin and the salt thereof in the solution can have affinity for the cyanide and can be combined with the cyanideto stable cyanocobalamin is used, the concentration of cyanocobalamin in the solution is detected through high performance liquid chromatography, and the concentration of the cyanide is thus calculated. Only a cyanocobalamin standard solution needs to be prepared during the determination process, and preparation of a cyanide standard solution is not needed, the determination is quick and safe, and the determined cyanide concentration range is wide.

Description

technical field [0001] The invention relates to a method for measuring the concentration of cyanide ions in a solution, belonging to the technical field of chemical analysis. Background technique [0002] Free cyanide is a highly toxic substance, and it is one of the necessary inspection items for environmental monitoring and food analysis. The state stipulates that the limit of cyanide concentration in the "Drinking Water Sanitation Standard" is 0.05mg / L, and the state's "Industrial "Three Wastes" Discharge Trial Standard" sets the maximum allowable discharge concentration of cyanide in industrial wastewater as 0.5mg / L (with Free cyanide ion concentration meter). [0003] At present, the methods for determining the concentration of cyanide in solution mainly include volumetric method and spectrophotometric method (HJ484-2009). Both the volumetric method and the spectrophotometric method are easily interfered by other ions or colored substances, the recovery rate is unstab...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 刘军旗张京月任静任洁刘耀升吴晓蕊毕璐瑶张森邢运哲孟婷婷
Owner HEBEI HUARONG PHARMA
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