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Determination of Monoethylene Glycol in Gas Condensate Samples by Microchip Micellar Electrokinetic Chromatography Integrated With Capacitively Coupled Contactless Conductivity Detection

Year: 2026

Type: article

Abstract: ABSTRACT This study describes the use of microchip micellar electrokinetic chromatography (MEKC) integrated with capacitively coupled contactless conductivity detection (C 4 D) for the determination of monoethylene glycol (MEG) in gas condensate samples. The samples were subjected to a liquid–liquid extraction step and then analyzed by chip‐based MEKC‐C 4 D. For this purpose, sodium dodecyl sulfate (SDS) was used as a surfactant at a concentration of 30 mmol L −1 added in 50 mmol L −1 phosphate (pH = 9.0). Samples were introduced into microchannels through floating injection mode by applying a voltage of 600 V during 10 s. Separations were performed under an electric field of 82 V cm −1 and monitored by C 4 D measurements recorded applying a 1200‐kHz frequency sinusoidal wave with 20‐V pp excitation voltage. The proposed methodology employing MEKC‐C 4 D revealed a linear behavior (r 2 ≥ 0.99) in the MEG concentration range between 150–450 µmol L −1 and LOD equal to 33 µmol L −1 . Three gas condensate samples were then analyzed, and the achieved MEG concentration values ranged from 173 to 213 µmol L −1 . Recovery experiments provided values between 89 and 102%. Based on the results reported in this study, MEKC‐C 4 D devices have demonstrated to be a promising and ecological analytical tool for MEG analysis with huge potential for in‐field applications.

Source: Electrophoresis

DOI: 10.1002/elps.70070