Calibration and reproducibility
A sample matrix elimination technology was used in the IC system of this study. It traps ions within the samples on a concentrator, to be later eluted by aqueous eluent and delivered into the IC columns for analysis, thus eliminating interference from the original sample matrix. To determine if standards in an aqueous matrix can be used to measure ion concentrations in solvent-based samples, phosphate standard was diluted with both Milli-Q water and acetone to the same concentration, and their respective IC profiles were compared, as shown in Fig. 1(a). It was discovered that the ions in the two sample matrix exhibited identical retention times, but different area responses. Therefore aqueous standards cannot be applied directly for quantification of ions in solvent, and subsequently all standards were made in acetone matrix.
Calibration and reproducibility
A sample matrix elimination technology was used in the IC system of this study. It traps ions within the samples on a concentrator, to be later eluted by aqueous eluent and delivered into the IC columns for analysis, thus eliminating interference from the original sample matrix. To determine if standards in an aqueous matrix can be used to measure ion concentrations in solvent-based samples, phosphate standard was diluted with both Milli-Q water and acetone to the same concentration, and their respective IC profiles were compared, as shown in Fig. 1(a). It was discovered that the ions in the two sample matrix exhibited identical retention times, but different area responses. Therefore aqueous standards cannot be applied directly for quantification of ions in solvent, and subsequently all standards were made in acetone matrix.
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