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A rapid method was developed to identify and quantify the azide ion (N3–) in gastric fluid and urine. N3– in diluted biological fluids was reacted with NaAuCl4 to produce Au(N3)2–, which was extracted with octanol. Five microliters of the extract were flow-injected into an electrospray ionization tandem mass spectrometric instrument. Quantification of N3– was performed by selected reaction monitoring...
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