Sodium azide has been widely used as major component in many different industries such as production of pesticides, anti-hypertensives, anti-HIV drugs and explosives as well as preservatives[1-4]. Furthermore, sodium azide is a highly toxic compound classified as a first-class poison whose lethal dose for oral ingestion in human (LD50) is less than 50 (mg kg−1)[5]. Kinetic spectrophotometric methods have been extensively used because of their significant advantages for determination of many analytes at trace levels. We have reported a simple, sensitive and inexpensive kinetic spectrophotometric method for the determination of azide ion.This method is based on kinetic reaction of sodium azide with pentacyanoamminoferrate(II) complex. Taguchi method was applied as an experimental design to determine optimum conditions. Two linear range of 1.16-60 and 60 to 120 (µg.mL-1), the detection limit of 0.35 (µg.mL-1) with reproducibility of %2.35 were obtained.The interference of several cations and anions were investigated. This technique was successfully used for determination of azide ion in waste and well waters.

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