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Method for the detection of cyanide ion

A technology of cyanide ion and copper ion, which is applied in the field of detection of cyanide ion, can solve the problems of many interference factors, cumbersome measurement procedures, narrow measurement range, etc., and achieve the effects of cost reduction, obvious phenomenon and good reproducibility

Inactive Publication Date: 2009-11-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of these two methods is that there are many interference factors. Even if the sample is not too complex, it must be distilled before measurement, so the measurement procedures are more cumbersome and the range of measurement is relatively narrow. The reagent used in the latter method is pyridine. It has a foul smell and toxicity, and benzidine is a carcinogen, which affects the health of laboratory personnel

Method used

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  • Method for the detection of cyanide ion
  • Method for the detection of cyanide ion
  • Method for the detection of cyanide ion

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add the copper reagent sodium diethylenedithiocarbamate in twice-distilled water of pH=6.8 to prepare a concentration of 5.0×10 -4 mol / L sodium diethylenedithiocarbamate aqueous solution, and then add different amounts of the concentration of 1.0 × 10 -3 mol / L copper nitrate solution, the concentration of copper ions in the solution after adding is 0, 0.5×10 -5 , 1.0×10 -5 , 1.5×10 -5 , 2.0×10 -5 , 2.5×10 -5 , 3.0×10 -5 , 3.5×10 -5 , 4.0×10 -5 , 4.5×10 -5 , 5.0×10 -5 mol / L, the prepared solution is poured into a 10 mm wide quartz cell respectively, and the respective spectrograms are obtained in an ultraviolet spectrometer (Shimadzu UV-2550 spectrometer), figure 1 is the UV-visible spectrum after changing the concentration of copper ions.

[0024] (2) Prepare 5.0×10 in twice distilled water with pH=6.8 -5 mol / L copper nitrate solution, the concentration of adding different amounts is 1.0×10 -2 mol / L sodium cyanide solution, the concentration of cyanide i...

Embodiment 2

[0026] (1) Add 1.0×10 -2 mol / L copper reagent sodium diethylenedithiocarbamate makes the concentration of sodium diethylenedithiocarbamate 5.0×10 -4 mol / L, the concentration of adding different amounts is 1.0×10 -3 mol / L copper nitrate solution, the concentration of copper nitrate in the solution after adding is 0, 0.3×10 -5 , 0.7×10 -5 , 1.3×10 -5 , 2.0×10 -5 , 2.7×10 -5 , 3.3×10 -5 , 4.0×10 -5 , 5.0×10 -5 mol / L, the prepared solution is poured into a 10 mm wide quartz cell respectively, and the respective spectrograms are obtained in an ultraviolet spectrometer (Shimadzu UV-2550 spectrometer), image 3 is the UV-visible spectrum after changing the concentration of copper ions.

[0027] (2) Prepare 5.0×10 in the sodium hydroxide aqueous solution of pH=9.1 -5 mol / L copper nitrate solution, the concentration of adding different amounts is 1.0×10 -2 mol / L sodium cyanide solution, the concentration of cyanide ion in the solution after adding is 0, 1.0×10 -4 , 2.0×10 ...

Embodiment 3

[0029] (1) Add copper reagent sodium diethylenedithiocarbamate to tap water so that the concentration of sodium diethylenedithiocarbamate is 5.0×10 -4 mol / L, the solution after adding copper reagent is colorless and transparent, add 1.0×10 -3 mol / L copper nitrate solution, the concentration of copper ions in the solution after adding is 5.0×10 -4 mol / L, the color of the solution after adding copper nitrate is dark yellow.

[0030] (2) Prepare 5.0×10 in tap water -4 mol / L copper nitrate solution, the solution after adding copper nitrate is colorless and transparent, and the concentration is 1.0×10 -2 mol / L sodium cyanide solution so that the cyanide ion concentration of the added solution is 7.0×10 -4 mol / L, the solution after adding sodium cyanide is colorless and transparent, then add copper reagent sodium diethylenedithiocarbamate, the concentration of copper reagent mother liquor is 1.0×10 -2 mol / L, so that the copper reagent concentration in the solution after adding i...

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Abstract

The invention relates to a method for the detection of cyanide ion, comprising the steps of: adding copper ions into a solution to be tested to obtain a copper ion-containing solution having the concentration of 5.0*10-5.0*10mol / L, then adding copper reagent of sodium diethyldithiocarbamate into the copper ion-containing solution, wherein, if the color of the solution is not changed after the addition of the copper reagent, the fact that the solution to be tested contains cyanide ion is represented, and if the color of the solution is changed after the addition of the copper reagent, the solution to be tested contains cyanide ion having the concentration less than 6.0*10mol / L or contains no cyanide ion. The invention is applicable to aqueous solution system, visible to naked eyes, low in price and detection limit, and reversible in phenomenon. Change of the color of the system is observable to naked eyes by means of the addition of cyanide ion of 1.0*10, the larger the concentration is, the more obvious the change of the color takes place, and the color is gradually changed from dark yellow into transparent color. With good reproducibility when pH is equal to 6-10, the solution can be used for the detection of minim-cyanide ion and can be practicably applied in aspects of drinking water, food, environmental protection, etc.

Description

technical field [0001] The invention relates to a method for detecting cyanide ions. Background technique [0002] Cyanide refers to the substance containing cyano group in the compound molecule. According to whether the element or group connected to the cyano group is organic or inorganic, cyanides are divided into two categories, namely organic cyanides and inorganic cyanides. Inorganic cyanide has a wide range of applications and sources, and there are many varieties. According to its nature and composition, it is divided into two types, namely simple cyanide and complex cyanide. As we all know, most inorganic cyanides are highly toxic and highly toxic substances. A very small amount of cyanides will poison humans and animals to death in a short period of time, and will also cause crop production reduction. Cases of acute poisoning of fish, livestock and people caused by cyanide polluted water bodies have been reported both at home and abroad. [0003] Cyanide is more ...

Claims

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Application Information

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IPC IPC(8): G01N31/22
Inventor 李振娄筱叮秦金贵
Owner WUHAN UNIV
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