Development and validation of an ionic chromatography method for nitrite determination in processed foods and estimation of daily nitrite intake in Korea

A simple ionic chromatography method for nitrite analysis in processed food products was developed and validated. Nitrite in the sample was extracted using 80 °C distilled deionized water and centrifuged. Purification of nitrite from sample solution was performed using OnGuard II Ag, OnGuard II RP and OnGuard II Na cartridge connected in order. Determination of nitrite was carried out using IonPac AG9-HC (4 × 50 mm) and IonPac AS9-HC (4 × 250 mm) columns and a 9 mM sodium carbonate mobile phase. The validated results showed good linearity (r