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Ion chromatography with amperometric detector to detect cyanide and sulfide

Cyanide specifically refers to a compound with a cyano group (CN). The commonly known cyanide is inorganic cyanide, and the common ones are potassium cyanide and sodium cyanide. Cyanide enters the human body and releases cyanide ions, which combine with the ferric iron of the oxidative cytochrome oxidase in the cell mitochondria to prevent the ferric iron in the oxidase from reducing, hindering the normal respiration of the cells, and the tissue cells cannot use oxygen, resulting in hypoxia. , Causing the body to fall into a state of suffocation. In addition, the molecules of certain nitrile compounds have a direct inhibitory effect on the central nervous system.
In inorganic chemistry, sulfide refers to a type of compound formed by a metal or non-metal with strong electropositiveness and sulfur. Most metal sulfides can be regarded as salts of hydrosulfuric acid. Sulfide easily escapes from the water in the air, and has a foul smell, which seriously pollutes the atmosphere and endangers human health. When the concentration of sulfide in the sewage is too high, the cell structure of the microorganisms in the activated sludge is destroyed and the enzymes in the bacteria are deteriorated, and their activities are inhibited and poisoned. On the other hand, excessively high sulfide concentration will cause filamentous sulfur bacteria, which will cause sludge expansion, decrease in sedimentation performance, and cause sludge loss.

Analysis instrument configuration

Ion Chromatograph: IC6100
Autosampler: AS3100
Ampere detector: ECD3100 working electrode-Ag electrode, three-potential integral pulse

Ion Chromatograph with autosampler and ampere detector

Chromatographic conditions

Column IonPac AS7 2×250mm
Mobile phase 100mM NaOH+250mM NaOAc
Column temperature 30℃ Pond temperature 35℃
Detector Ampere detector Injection volume 25μL
electrode Silver electrode Reference electrode Ag/AgCl

Standard curve test

Standard curve overlay chromatogram
S linear
CN linear

Note: The linearity of S and CN standard curves are both higher than 0.995.

Repeatability test

In this test, different concentration gradient standard solutions were tested, and the qualitative and quantitative repeatability of S and CN under different concentrations were investigated.

S+CN-5μg/L continuous 7-needle overlapping chromatogram
S+CN-20μg/L continuous 7-needle overlapping chromatogram
S+CN-50μg/L continuous 7-needle overlapping chromatogram

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