Determination of manganese in feedstuffs by flow injection spectrophotometry based on rapid formation of permanganate at room temperature

A simple and rapid flow injection spectrophotometric procedure was develope d for determination of manganese. In the presence of pyrophosphate and acet ate, manganese was immediately oxidized to permanganate by periodate at roo m temperature in slightly alkaline medium. Under optimized conditions, the determination was made with a sampling rate of 120/h, a linear range of 0-3 0 mg/L Mn(II), a detection limit (S/N = 3) of 0.08 mg/L, and a relative sta ndard deviation of 0.6% (n = 11) at 10 mg/L Mn(II). The proposed method was used to determine manganese in trace mineral premixes and feedstuffs. Resu lts agreed well with those obtained by the standard atomic absorption spect roscopy method.