Determination of sulfate ion in four aromatic sulfonates by ion chromatography coupled with on-line solid phase extraction

doi:10.3724/SP.J.1123.2016.11022

Abstract

Abstract:

A new ion chromatography method coupled with on-line solid phase extraction was developed for the determination of sulfate ion in four aromatic sulfonates. A self packed porous graphitized carbon solid phase extraction (PGC-SPE) column was used for on-line sample pre-treatment and a valve switching-large volume injection mode was used for sample injection in the system. After processed by PGC-SPE column, the inorganic ions contained in samples got into a loop and then were flushed into the detection system. The eluent of SPE for on-line matrix enrichment was 1.5 mmol/L sodium carbonate at a flow rate of 0.8 mL/min. The injection volume was 20 μL. The analytical columns were SH-AC-3 (250 mm×4.0 mm)+SH-AG-3 (50 mm×4.0 mm). The column temperature was set at 35℃. The elution was performed by 6 mmol/L sodium carbonate-4 mmol/L sodium bicarbonate at a flow rate of 0.8 mL/min. The results showed that the sulfate ion in the range of 0.50-20.00 mg/L had a good linear relationship and the correlation coefficient was 0.9983. The relative standard deviations (RSDs) of the retention time, peak height and peak area were 0.28%-2.86%. The limit of detection was 0.0106 mg/L. The recoveries were 91.01%-109.3%. The entire online analysis process was completed within 25 min with small injection volume, short analysis time and high efficiency. This method possesses good linearity and repeatability.

Key words: aromatic sulfonates, ion chromatography (IC), on-line solid phase extraction (on-line SPE), porous graphitized carbon (PGC), self-packing technology, sulfate ion

CLC Number:

O658

CHEN Ailian, FANG Linmei, LÜ Haixia, SHI Chaoou. Determination of sulfate ion in four aromatic sulfonates by ion chromatography coupled with on-line solid phase extraction[J]. Chinese Journal of Chromatography, 2017, 35(5): 538-543.

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