The scientists developed a method to measure nitrate and nitrite levels in milk powder using ion chromatography. They used a specific column and eluent, with a flow rate of 0.70 ml/min and a sample injection volume of 20 μl. By employing inline dialysis and a conductivity detector, they achieved excellent results with high accuracy and sensitivity. The method showed good relativity, with recovery rates between 94.9% and 104.2%. The limit of detection for nitrate ions was 1.74 μg/L, and for nitrite ions, it was 0.96 μg/L. Overall, the method is easy to use, highly sensitive, and provides consistent results.