Simultaneous determination of chromium (hexavalent), glyphosate, perchlorate and 7 anions content in drinking water by ion chromatography

An ion chromatography method for simultaneous determination of trace chromium (hexavalent), glyphosate (GLY), perchlorate and 7 conventional anions (F^-, Cl^-, NO₂^-, Br^-, NO₃^-, SO₄^2-, PO₄^3-) in drinking water by optimizing chromatographic conditions and methodological investigation was established, and the 10 targets in drinking water was determined. The results showed that the optimized chromatographic conditions were: Dionex IonPac^TM AS20 as analytical column, Dionex IonPac^TM AG20 as protection column, KOH as eluent, gradient elution, flow rate 1.0 ml/min, suppressor ADRS600 (4 mm), suppression current 138 mA, column temperature 30 ℃, detector temperature 35 ℃, and sample volume 500 μL. Trace chromium (hexavalent), GLY, perchlorate and 7 conventional anions had good linear relationships in their respective linear ranges (R²>0.999). The limits of detection (LOD) and limits of quantification (LOQ) of each substance were 0.079-1.145 μg/L and 0.263-3.817 μg/L. The resolution between each substance was>1.5. The relative standard deviation (RSD) of the reproducibility and stability test results were both≤3.38%. The spiked recovery rate tests with drinking water as the substrate, the average recovery rates of each substance were 90.0%-99.3%, and the RSD of spiked recovery rate and precision tests were 0.67%-4.33% and 0.12%-3.33%, respectively. In summary, the method was suitable for simultaneous determination of trace chromium (hexavalent), GLY, perchlorate and 7 common anions in drinking water.