Determinations of Trace Nitrite and Bromate in Packaged Drinking Water by Ion Chromatography

Objective To establish an ion chromatography with large volume direct injection to determine trace nitrite and bromate in packaged drinking water.

Methods The injection sample volume was set at 500 μL.The chromatographic separation was performed on Dionex Ionpac AS19 column with different concentrations of potassium hydroxide solution as eluent to determine trace nitrite and bromate in packaged drinking water.

Results Regarding nitrite and bromate,good linear relationships were shown in the range of 0-66 μg/L and 0-100 μg/L respectively,and the correlation coefficients (r) were 0.999 7 and 0.999 8 respectively.The limits of detection were 0.13 μg/L and 0.24 μg/L respectively.The recovery rates for nitrite and bromate were tested at three different concentrations ranging from 88.2% to 106.1% and from 91.1% to 100.4% respectively,and the relative standard derivations were 1.4%-4.5% and 0.5%-4.4% respectively.

Conclusion This method is simple,environmental-friendly,and highly efficient and accurate,and could be applied to the determinations of trace nitrite and bromate in packaged drinking water.