Non-equilibrium Flow Injection Spectrophotometry for Nitrite Determination

The reaction of nitrite with basic fuchsin in acid medium was studied by flow injection spectrophotometry. The experiment conditions are optimized. A new analytical method for the determination of trace nitrite based on non _ equilibrium principle is established using self _ assembled and computerized flow injection analyzer. The linear range for nitrite is in 0.0～5.0 mg/L, analytical speed is 36/h. The method was applied to direct determination of nitrite in collapse lake water, fishpond water, power plant waste water and well water with satisfactory results.