Objective To develop a simple and sensitive method for determination of trace nitrite nitrogen in water samples.
Methods Nitrite nitrogen was determined directly using the Criess diazo-coupling reaction and the formed azo dye was measured at 540 nm and 580 nm in hydrochloric acid medium.
Results Nitrite nitrogen in the linear concentration range of 0-0.025 μg/mL was determined with a detection limit of 0.000 5 μg/mL. r=0.999 96, RSD=1.7%.
Conclusion The method has been applied to the determination of trace nitrite nitrogen in water samples. The possible reaction mechanism was also discussed.
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