Quantification of Anionic Surfactant in Brine by Using Solvent Extraction Followed by Spectrophotometry, Evaporative Light Scattering Detection, and Mass Spectrometry

摘要

SEV: Method was easy, reproducible and cost-effective. However, it had a long analysis time and could not distinguish the surfactant from other compounds that can complex with ethyl violet. ELSD: Method was reproducible and can be automated. However, it had the worst detection limit and could not distinguish other compounds co-eluting with the surfactant. MS: Ionized compounds that could interfere with the surfactants for the SEV and ELSD methods can be distinguished from the analyte ions based on their different m/z-values. Method had the lowest detection limit but was way most expensive. The method needs to be improved to achieve a wider linear dynamic range and a higher correlation coefficient.