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The sensitivity of the gas chromatograph NPD is related to the molecular structure of the compound VWR vials . When the gas chromatograph is used to detect nitrogen-containing compounds, it is most sensitive to easy decomposition into CN-. Other structures, especially nitrates and amides, have a small response, and their response order is: azo compound > cyanide > nitrogen-containing heterocyclic compound > aromatic hydrocarbon > nitro compound > fatty amine >VWR vials amide.
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