Sodium nitrite is not quantitatively reduced under the present experimental conditions, since alkaline reduction of nitrates and nitrites with iron(II) are quantitative only in 28% sodium hydroxide (17) and lower alkali concentration requires silver or copper catalyst (18).Interferences. The use of iron(II) in acidic and alkaline media for reduction of nitro and nitroso groups has the advantage over titanium(III), since very little interference is (16) F. Feigl, "Spot Tests in Organic Analysis," Elsevier, Amster-

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