Ion-chromatographic analysis of common anions, acetate, and formate in 30% hydrogen peroxide: Statistical evaluation of two automated microbore systems

Two hydroxide-selective microbore analytical columns (the Dionex AS11 and AS15) were tested and compared for the quantitation of anionic species in 30% hydrogen peroxide. The ions of interest were fluoride, acetate, formate, chloride, bromide, nitrate, sulfate, and phosphate. Statistically sound calibration and spiking studies were carried out, investigating the range of a blank to 60 ppb. Prior to injection onto the separators, peroxides were loaded without pretreatment onto a concentrator column, which was then washed with deionized water to remove the matrix. Although retention times gradually decreased during the spiking studies, reliable quantitation was still achievable on both columns at the target concentration of 30 ppb. However, various resolution problems meant that the AS11 should not be recommended for this application.