Analysis of Endocrine Disruptors in Tap, Surface and Wastewater by Online Concentration Liquid Chromatography Tandem Mass Spectrometry

Academic Research Topics in Environmental Measurement and Monitoring
Oral Presentation

Prepared by , K. Goeury, G. Munoz

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The list of endocrine disrupting compounds (EDCs) defined under U.S. EPA Method 539 was recently expanded to include additional hormones and bisphenol A (BPA). Here, we validated a fast and robust alternative method compliant with Method 539.1 requirements in diverse water matrixes (i.e., ultra-pure water, tap water, surface water, and wastewater influent and effluent). Automated large volume injection solid phase extraction (SPE) coupled on-line to ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) was investigated for this purpose. The surveyed molecules included 13 EPA-priority hormones (testosterone, progesterone, medroxyprogesterone, levonorgestrel, norethindrone, androstenedione, estrone, ?-estradiol, ?-estradiol, equilin, equilenin, ethinylestradiol, estriol) and BPA. Combinations of ionization source and mobile phases were optimized for improved sensitivity. Suitable chromatographic performances were obtained and the implementation of an on-line SPE washing step consecutive to sample loading was investigated. On-line SPE extraction efficiencies in acceptable ranges (64-79%) and detection limits in the order of nanogram per liter or sub-nanogram per liter were obtained. The linearity range extended over 2-3 orders of magnitude, with determination coefficients (R2) typically > 0.9980. Robust precision and trueness complying with acceptance criteria (70130%) were obtained for the scope of analytes/matrix combinations. Limited internal standard variations were also observed across samples (18%), well within the 50% acceptance criterion. The method was successfully applied to field-collected samples in Canada and summed EDC concentrations were reported in the range of 0.631 ngL-1, 1.73.9 ngL-1, 260790 ngL-1, and 38360 ngL-1 in tap water, surface water, effluent and influent wastewater samples, respectively.