The determination of anions is one of the most important IC applications. Here we have updated Application Note 154 with the 4µm-resin-particle IonPac AS18-Fast-4µm column with expected backpressures approaching the previous system's limitations. In this Application Update, fast anion runs (9 min) were achieved with a gradient separation, saving 4 min run time with while retaining similar chromatography with higher sensitivity than the previous application. This analysis was facilitated by the high pressure capable Dionex Integrion HPIC system configured for Reagent-Free IC.

This method shows the determination of inorganic anions in an environmental water sample, previously published in Application Note 154. In this record, the method is executed on an Integrion HPIC system with eluent generation.

Samples with high ion concentrations require loading less volume or diluting prior to injection into an ion chromatography system to avoid exceeding the column capacity and to ensure that the concentrations determined fall within the calibration range.This Technical Note discusses automated dilutions using the Dionex AS-AP Autosampler with and without the Dionex Sample Conductivity and pH Accessory, reviews experimental data, and recommends conditions for obtaining optimal results.

Carbonate can interfere with accurate quantification of adjoining anions, such as sulfate. Here we show the efficient removal of the carbonate peak from a carbonated mineral water sample using the Dionex CRD 200 device.

Carbonate can interfere with accurate quantification of adjoining anions, such as sulfate. Here we show the efficient removal of the carbonate peak from a synthetic drinking water sample using the Dionex CRD 200 device. In this example, the artificial drinking water sample (#2) contains: 0.1 mg/L of fluoride, nitrite, chlorate, bromide, and phosphate; 5 mg/L nitrate; 50 mg/L sulfate; 100 mg/L chloride and carbonate.