Anion separations for liquid chromatography using propylpyridinium silica as the stationary phase

Analytical curves, for concentrations ranging from 0.25 to 10 mg L−1 for the inorganic anions chloride, nitrite, bromide and nitrate, showed good linear correlations (r > 0.998). The method was tested with certified rainwater samples. The measured and certified values were in good agreement, indicating that the new phase holds significant promise for the analysis of these anions in environmental samples.