Fate and Analysis of Endocrine-Disrupting Compounds in a Wastewater Treatment Plant in Portugal

This paper presents the study of the occurrence of ten endocrine-disrupting compounds in twenty wastewater samples, collected from different sampling points throughout a wastewater treatment plant process. This work was assessed using ultra-performance liquid chromatography with electrospray ionization-tandem mass spectrometry that provides simultaneous quantification and confirmation of the presence of these emerging compounds. All samples were previously cleaned with vacuum filtration and extracted by solid-phase extraction. The compounds studied in this work are 17a-estradiol, ethinylestradiol, estriol, estrone, progesterone, mestranol and diethylstilbestrol, 4-nnonylphenol, 4-tert-octylphenol and bisphenol A. The analytical limits were calculated for each compound and were used to identify and these target compounds in a wastewater treatment plant. The main conclusions obtained during this study emphasized that wastewater is an important contamination source of these compounds, the most common being bisphenol A and nonylphenol and wastewater treatment plants are not structured to remove endocrine-disrupting compounds. However some removal efficiencies were achieved for estriol (around 98 %) and bisphenol A (around 67 %) along treatment process, indicating that with some preventive approaches it is possible to minimize this problem.