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
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[0022] Example 1:
[0023] (1) Add the copper reagent sodium diethylenedithiocarbamate to pH=6.8 double distilled water to prepare a concentration of 5.0×10 -4 mol / L sodium diethylenedithiocarbamate aqueous solution, and then add different amounts of 1.0×10 -3 mol / L copper nitrate solution, the copper ion concentration in the added solution 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, pour the prepared solution into a 10-mm wide quartz cell, and get their respective spectra in a Shimadzu UV-2550 spectrometer, figure 1 It is the ultraviolet-visible spectrum after copper ion concentration is changed.
[0024] (2) Prepare 5.0×10 in twice distilled water with pH=6.8 -5 mol / L copper nitrate solution, add different amount of concentration to 1.0×10 -2 mol / L sodium cyanide solution, the cyanide ion concentration in the added solution is 0, 1.0×10 -4 , 2.0×10 -4 , 2.5×10 -4 , 3.0×10 -4 , 4.0×10 -4 , 4.5...
Example Embodiment
[0025] Example 2:
[0026] (1) Add 1.0×10 to the pH=9.1 aqueous sodium hydroxide solution -2 mol / L copper reagent sodium diethylenedithiocarbamate makes the concentration of sodium diethylenedithiocarbamate 5.0×10 -4 mol / L, add different amount of concentration to 1.0×10 -3 mol / L copper nitrate solution, the concentration of copper nitrate in the added solution 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, pour the prepared solution into a 10-mm wide quartz cell, and get their respective spectra in a Shimadzu UV-2550 spectrometer, image 3 It is the ultraviolet-visible spectrum after copper ion concentration is changed.
[0027] (2) Prepare 5.0×10 in sodium hydroxide aqueous solution with pH=9.1 -5 mol / L copper nitrate solution, add different amount of concentration to 1.0×10 -2 mol / L sodium cyanide solution, the cyanide ion concentration in the added solution is 0, 1.0×10 -4 , 2.0×10 -4 , 3.0×10 -4 , 3.5×10 -4 , 4.0×10 ...
Example Embodiment
[0028] Example 3:
[0029] (1) Add the copper reagent sodium diethylenedithiocarbamate to tap water to make the concentration of sodium diethylenedithiocarbamate 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 copper ion concentration in the added solution 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, and then adding copper reagent sodium diethylenedithiocarbamate, the concentration of copper reagent mother liquor is 1.0×10 -2 mol / L, so that the concentration of copper reagent in the added solu...
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