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摘要: A flow injection analysis (FIA) system for the determination of ammonia in air samples using indophenol method was applied. Ammonia transferred into deionized water as an absorbing solution. The sample solution injected a carrier (distilled water) and then reacted with sodium hypochlorite (0.05% Cl ₂ ) hydroxide 0.05 M, followed by reaction 1-naphthol (0.50%) to allow blue product. product spectrophotometrically monitored at 720 nm. linear calibration curve range 0.05›0.40 mg/L obtained. Good linearity (y=0.0725x-0.027, R²=0.9990) shown. successfully applied samples.