Alternative methods for nitrate and nitrite determination in foodstuffs have been developed more recently, including spectroscopic determination after enzymatic reduction [15], differential pulse voltammetry [16] and capillary electrophoresis [17]. The use of chromatography is potentially attractive since it is more rapid, sensitive and selective than methods based on reduction/colorimetry [3], [18] and [19]. A study was performed to obtain an alternative chromatographic method to determine residual nitrite and nitrate in foods. Limits of detection of 1 and 10 mg/kg, respectively, for nitrite and nitrate are reported [3]. Columns containing a strong anion exchanger packing material, such as, polymethacrylate resin with a quarternary ammonium functional group are necessary for assuring reliability, the inconvenient is that this type of columns are expensive.