Simultaneous determination of nitrite and nitrate in meat products by suppressed conductivity-ion chromatography

In this paper,a sensitive and selective analytical method based on suppressed conductivity-ion chromatography has been developed for the simultaneous determination of nitrite and nitrate in meat products.After the ultrasonic extraction of nitrite and nitrate in food,the ion separation was performed on a DIONEX IonPac AS19 column(4 mm × 250 mm)with a linear gradient elution program,eluted by DIONEX EG40 eluent generator and detected by suppressed conductivity detector.The results revealed that the limits of detection(3S/N)for nitrite and nitrate were 0.6 mg/kg and 0.8 mg/kg,with good linearities in the range of 0.1 ?g/mL ~ 50 ?g/mL as well as correlative coefficients of 0.9992 and 0.9989 respectively.The mean recoveries were 98.4% and 96.5% with the precision less than 2.8% and 3.2%.This method was proved to be sensitive,reproducible and suitable for the determination of nitrite and nitrate in meat products.