Effects of High Concentration of Chloride on the Determination of Trace Anions by Ion Chromatography

Abstract

Using both UV-Vis and conductivity detectors, the effects of high concentration of chloride on the determination of trace anions were studied on three different analytical columns by ion chromatography. The variations of retention behavior of these anions were caused by self-elution effect and on-column eluent change in the presence of high concentration of chloride. As the chloride concentration increased, linear ranges of the other anions became narrow. The anions separated on the column, which had higher capacity and had wider linear ranges. When their peaks overlapped with chloride, the deviations of weak acid anions were caused by anion-proton interactions within the suppressor. However, the other weak acid anions, which could not overlap with chloride and the strong acids anions, were not affected. In this paper, accurately quantitative analysis methods and their linear ranges were determined.

Redox Speciation of Vanadium in Estuarine Waters Using Improved Methodology Based on Anion Exchange Chromatography Coupled to HR ICP-MS System

“…Consequently, not all V species present in the sample successfully adsorb on the column, which leads to their partial elution within the void volume. The amount of vanadium successfully adsorbed on the anion exchange column depends on the concentration of interfering anion(s) [ 31 ]. Although in the investigated “Vrnaža port” (VP) samples, an appreciable amount of V(IV) was determined (see discussion later), the chromatographic peaks corresponding to V(IV) were not observed.…”

“…However, ICP-MS is more often used for vanadium determination, mainly because it enables element selective measurement with higher sensitivity, appropriate for the measurement of natural samples [ 23 ]. On the other hand, this analytical setup can be prone to matrix effects originating from environmental samples, especially those of high salinity [ 28 , 29 , 30 , 31 ]. Interactions of matrix ions with column, as well as interferences originating from spectrometric devices, can lead to peak broadening, suppression or enhancement of the analyte signal, co-elution effects, microgradient elution, etc.…”